View source for Hypertension

{{short description| Long-term high blood pressure in the arteries}}
{{About|arterial hypertension|other forms of hypertension}}
{{Infobox medical condition (new)
| name          = Hypertension 
| image         = Grade 1 hypertension.jpg
| caption       = Automated arm [[sphygmomanometer|blood pressure meter]] showing [[artery|arterial]] hypertension (shown by a [[systolic blood pressure]] 158&nbsp;mmHg, [[diastolic blood pressure]] 99&nbsp;mmHg and [[heart rate]] of 80 beats per minute)
| field         = [[Cardiology]]
| synonyms      = Arterial hypertension, high blood pressure
| symptoms      = None
| complications = [[Coronary artery disease]], [[stroke]], [[heart failure]], [[peripheral arterial disease]], [[vision loss]], [[chronic kidney disease]], [[dementia]]
| onset         =
| duration      =
| causes        = Usually lifestyle and genetic factors
| risks         = [[Sleep deprivation|Lack of sleep]], [[Hypernatremia|excess salt]], [[overweight|excess body weight]], [[smoking]], alcohol, air pollution
| diagnosis     = Resting blood pressure<br>&nbsp;130/80 or 140/90&nbsp;mmHg
| differential  =
| prevention    =
| treatment     = Lifestyle changes, medications
| medication    =
| prognosis     =
| frequency     = 16–37% globally
| deaths        = 9.4 million / 18% (2010)
| alt           =
}}
{{Human body weight}}
'''Hypertension''', also known as '''high blood pressure''', is a [[Chronic condition|long-term]] [[Disease|medical condition]] in which the [[blood pressure]] in the [[artery|arteries]] is persistently elevated. High blood pressure usually does not cause symptoms. It is, however, a major risk factor for [[stroke]], [[coronary artery disease]], [[heart failure]], [[atrial fibrillation]], [[peripheral arterial disease]], [[vision loss]], [[chronic kidney disease]], and [[dementia]]. Hypertension is a major cause of premature death worldwide.

High blood pressure is classified as [[Essential hypertension|primary (essential) hypertension]] or [[secondary hypertension]]. About 90–95% of cases are primary, defined as high blood pressure due to nonspecific lifestyle and [[Genetics|genetic]] factors. Lifestyle factors that increase the risk include excess [[salt]] in the diet, [[overweight|excess body weight]], [[smoking]], physical inactivity and [[Alcohol (drug)|alcohol]] use. The remaining 5–10% of cases are categorized as [[secondary high blood pressure]], defined as high blood pressure due to a clearly identifiable cause, such as chronic kidney disease, narrowing of the [[renal artery stenosis|kidney arteries]], an [[endocrine disorder]], or the use of [[birth control pills]].

Blood pressure is classified by two measurements, the [[Systole (medicine)|systolic]] (high reading) and [[Diastole#Diastolic pressure|diastolic]] (lower reading) pressures. For most adults, normal blood pressure at rest is within the range of 100–130 [[Millimeter of mercury|millimeters mercury]] (mmHg) systolic and 60–80 mmHg diastolic. For most adults, high blood pressure is present if the resting blood pressure is persistently at or above 130/80 or 140/90 mmHg. Different numbers apply to children. [[Ambulatory blood pressure monitoring]] over a 24-hour period appears more accurate than office-based [[blood pressure measurement]]. Hypertension is around twice as common in [[diabetic]]s.

Lifestyle changes and medications can lower blood pressure and decrease the risk of health complications. Lifestyle changes include [[weight loss]], [[Exercise|physical exercise]], decreased [[Health effects of salt|salt intake]], reducing alcohol intake, and a [[healthy diet]]. If lifestyle changes are not sufficient, then [[blood pressure medication]]s are used. Up to three medications taken concurrently can control blood pressure in 90% of people. The treatment of moderately high arterial blood pressure (defined as >160/100 mmHg) with medications is associated with an improved [[life expectancy]]. The effect of treatment of blood pressure between 130/80&nbsp;mmHg and 160/100&nbsp;mmHg is less clear, with some reviews finding benefit and others finding unclear benefit. High blood pressure affects between 16 and 37% of the population globally. In 2010 hypertension was believed to have been a factor in 17.8% of all deaths (9.4 million globally).
[[File:En.Wikipedia-VideoWiki-Hypertension.webm|thumb|thumbtime=2:16|upright=1.3|Video summary ([[Wikipedia:VideoWiki/Hypertension|script]])]]
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==Signs and symptoms==
Hypertension is rarely accompanied by [[Signs and symptoms|symptoms]], and its identification is usually through health  [[Screening (medicine)|screening]], or when seeking healthcare for an unrelated problem. Some people with high blood pressure report [[headache]]s (particularly at the [[Occiput|back of the head]] and in the morning), as well as [[lightheadedness]], [[vertigo]], [[tinnitus]] (buzzing or hissing in the ears), altered vision or [[Syncope (medicine)|fainting episodes]]. These symptoms, however, might be related to associated [[anxiety (mood)|anxiety]] rather than the high blood pressure itself.

On [[physical examination]], hypertension may be associated with the presence of changes in the [[optic fundus]] seen by [[ophthalmoscopy]]. The severity of the changes typical of [[hypertensive retinopathy]] is graded from I to IV; grades I and II may be difficult to differentiate. The severity of the retinopathy correlates roughly with the duration or the severity of the hypertension

===Secondary hypertension===
{{Main|Secondary hypertension}}
Secondary hypertension is hypertension due to an identifiable cause, and may result in certain specific additional signs and symptoms. For example, as well as causing high blood pressure, [[Cushing's syndrome]] frequently causes [[Abdominal obesity|truncal obesity]], [[glucose intolerance]], [[moon face]], a hump of fat behind the neck and shoulders (referred to as a buffalo hump), and purple abdominal [[stretch marks]]. [[Hyperthyroidism]] frequently causes weight loss with increased appetite, [[tachycardia|fast heart rate]], [[exophthalmos|bulging eyes]], and tremor. [[Renal artery stenosis]] (RAS) may be associated with a localized abdominal [[bruit]] to the left or right of the midline (unilateral RAS), or in both locations (bilateral RAS). [[Coarctation of the aorta]] frequently causes a decreased blood pressure in the lower extremities relative to the arms, or delayed or absent [[femoral artery|femoral arterial pulses]]. [[Pheochromocytoma]] may cause abrupt episodes of hypertension accompanied by headache, [[palpitation]]s, [[Pallor|pale appearance]], and [[Diaphoresis|excessive sweating]].

===Hypertensive crisis===
{{main|Hypertensive crisis}}
Severely elevated blood pressure (equal to or greater than a systolic 180 or diastolic of 120) is referred to as a hypertensive crisis. Hypertensive crisis is categorized as either [[hypertensive urgency]] or [[hypertensive emergency]], according to the absence or presence of end organ damage, respectively.

In hypertensive urgency, there is no evidence of end organ damage resulting from the elevated blood pressure. In these cases, oral medications are used to lower the BP gradually over 24 to 48 hours.

In hypertensive emergency, there is evidence of direct damage to one or more organs. The most affected organs include the brain, kidney, heart and lungs, producing symptoms which may include [[confusion]], drowsiness, chest pain and breathlessness. In hypertensive emergency, the blood pressure must be reduced more rapidly to stop ongoing organ damage, however, there is a lack of [[randomized controlled trial]] evidence for this approach.

===Pregnancy===
{{main|Gestational hypertension|Pre-eclampsia}}

Hypertension occurs in approximately 8–10% of pregnancies. Two blood pressure measurements six hours apart of greater than 140/90&nbsp;mm Hg are diagnostic of hypertension in pregnancy. High blood pressure in pregnancy can be classified as pre-existing hypertension, [[gestational hypertension]], or [[pre-eclampsia]]. Women who have chronic hypertension before their pregnancy are at increased risk of complications such as [[Preterm birth|premature birth]], [[Small for gestational age|low birthweight]] or [[stillbirth]]. Women who have high blood pressure and had complications in their pregnancy have three times the risk of developing [[cardiovascular disease]] compared to women with normal blood pressure who had no complications in pregnancy.

Pre-eclampsia is a serious condition of the second half of pregnancy and [[puerperium|following delivery]] characterised by increased blood pressure and the presence of [[proteinuria|protein in the urine]]. It occurs in about 5% of pregnancies and is responsible for approximately 16% of all [[maternal death]]s globally. Pre-eclampsia also doubles the risk of [[perinatal mortality|death of the baby around the time of birth]]. Usually there are no symptoms in pre-eclampsia and it is detected by routine screening. When symptoms of pre-eclampsia occur the most common are headache, visual disturbance (often "flashing lights"), vomiting, pain over the stomach, and [[edema|swelling]]. Pre-eclampsia can occasionally progress to a life-threatening condition called [[eclampsia]], which is a [[hypertensive emergency]] and has several serious complications including [[blindness|vision loss]], [[cerebral edema|brain swelling]], [[tonic-clonic seizures|seizures]], [[kidney failure]], [[pulmonary edema]], and [[disseminated intravascular coagulation]] (a blood clotting disorder).

In contrast, [[gestational hypertension]] is defined as new-onset hypertension during pregnancy without protein in the urine.

===Children===
[[Failure to thrive]], [[seizures]], [[irritability]], [[lethargy|lack of energy]], and [[Infant respiratory distress syndrome|difficulty in breathing]] can be associated with hypertension in newborns and young infants. In older infants and children, hypertension can cause headache, unexplained irritability, [[fatigue (medical)|fatigue]], failure to thrive, [[blurred vision]], [[epistaxis|nosebleeds]], and [[bell palsy|facial paralysis]].

==Causes==

===Primary hypertension===
{{Main|Essential hypertension}}
Hypertension results from a complex interaction of [[Gene|genes]] and environmental factors. Numerous common genetic variants with small effects on blood pressure have been identified as well as some rare genetic variants with large effects on blood pressure. Also, [[Genome-wide association study|genome-wide association studies (GWAS)]] have identified 35 genetic loci related to blood pressure; 12 of these genetic loci influencing blood pressure were newly found. Sentinel [[Single-nucleotide polymorphism|SNP]] for each new genetic locus identified has shown an association with [[DNA methylation]] at multiple nearby [[CpG site]]s. These sentinel SNP are located within genes related to vascular smooth muscle and renal function. DNA methylation might affect in some way linking common genetic variation to multiple [[phenotype]]s even though mechanisms underlying these associations are not understood. Single variant test performed in this study for the 35 sentinel SNP (known and new) showed that genetic variants singly or in aggregate contribute to risk of clinical phenotypes related to high blood pressure.

Coronary artery ectasia: Coronary artery ectasia (CAE) is characterized by the enlargement of a coronary artery to 1.5 times or more than other non-ectasia parts of the vessel. The pooled unadjusted OR of CAE in subjects with Hypertension (HTN) in comparison by subjects without HTN was estimated 1.44.

Blood pressure rises with [[aging]] when associated with a [[Western pattern diet|western diet]] and lifestyle and the risk of becoming hypertensive in later life is significant. Several environmental factors influence blood pressure. High salt intake raises the blood pressure in salt sensitive individuals; lack of exercise and central obesity can play a role in individual cases. The possible roles of other factors such as caffeine consumption, and [[vitamin D deficiency]] are less clear. [[Insulin resistance]], which is common in obesity and is a component of [[metabolic syndrome|syndrome X]] (or the [[metabolic syndrome]]), also contributes to hypertension.

Events in early life, such as [[low birth weight]], [[Smoking and pregnancy|maternal smoking]], and lack of [[breastfeeding]] may be risk factors for adult essential hypertension, although the mechanisms linking these exposures to adult hypertension remain unclear. An increased rate of [[hyperuricemia|high blood uric acid]] has been found in untreated people with hypertension in comparison with people with normal blood pressure, although it is uncertain whether the former plays a causal role or is subsidiary to poor kidney function. Average blood pressure may be higher in the winter than in the summer. [[Periodontal disease]] is also associated with high blood pressure.

===Secondary hypertension===
{{Main|Secondary hypertension}}
Secondary hypertension results from an identifiable cause. Kidney disease is the most common secondary cause of hypertension. Hypertension can also be caused by endocrine conditions, such as [[Cushing's syndrome]], [[hyperthyroidism]], [[hypothyroidism]], [[acromegaly]], [[Conn's syndrome]] or [[hyperaldosteronism]], [[renal artery stenosis]] (from [[atherosclerosis]] or [[fibromuscular dysplasia]]), [[hyperparathyroidism]], and [[pheochromocytoma]]. Other causes of secondary hypertension include [[obesity]], [[sleep apnea]], [[pregnancy]], [[coarctation of the aorta]], excessive eating of [[liquorice]], excessive drinking of alcohol, certain prescription medicines, herbal remedies, and [[stimulants]] such as [[coffee]], [[cocaine]] and [[methamphetamine]]. [[Arsenic]] exposure through drinking water has been shown to correlate with elevated blood pressure. [[depression (mood)|Depression]] was also linked to hypertension. [[Loneliness]] is also a risk factor.

A 2018 review found that any alcohol increased blood pressure in males while over one or two drinks increased the risk in females.

==Pathophysiology==
{{Main|Pathophysiology of hypertension}}
[[File:Mean arterial pressure.png|thumb|upright=1.4|Determinants of mean arterial pressure]]
[[File:Blausen 0486 HighBloodPressure 01.png|thumb|upright=1.4|Illustration depicting the effects of high blood pressure]]
In most people with established [[essential (primary) hypertension|essential hypertension]], increased resistance to blood flow ([[total peripheral resistance]]) accounts for the high pressure while [[cardiac output]] remains normal. There is evidence that some younger people with [[prehypertension]] or 'borderline hypertension' have high cardiac output, an elevated heart rate and normal peripheral resistance, termed hyperkinetic borderline hypertension. These individuals develop the typical features of established essential hypertension in later life as their cardiac output falls and peripheral resistance rises with age. Whether this pattern is typical of all people who ultimately develop hypertension is disputed. The increased peripheral resistance in established hypertension is mainly attributable to structural narrowing of small arteries and [[arteriole]]s, although a reduction in the number or density of capillaries may also contribute.

It is not clear whether or not [[vasoconstriction]] of arteriolar blood vessels plays a role in hypertension. Hypertension is also associated with decreased peripheral [[Compliance (physiology)|venous compliance]] which may increase [[venous return]], increase cardiac [[Preload (cardiology)|preload]] and, ultimately, cause [[diastolic dysfunction]].

[[Pulse pressure]] (the difference between systolic and diastolic blood pressure) is frequently increased in older people with hypertension. This can mean that systolic pressure is abnormally high, but diastolic pressure may be normal or low, a condition termed [[isolated systolic hypertension]]. The high pulse pressure in elderly people with hypertension or isolated systolic hypertension is explained by increased [[arterial stiffness]], which typically accompanies aging and may be exacerbated by high blood pressure.

Many mechanisms have been proposed to account for the rise in peripheral resistance in hypertension. Most evidence implicates either disturbances in the kidneys' salt and water handling (particularly abnormalities in the intrarenal [[renin–angiotensin system]]) or abnormalities of the [[sympathetic nervous system]]. These mechanisms are not mutually exclusive and it is likely that both contribute to some extent in most cases of essential hypertension. It has also been suggested that [[endothelial dysfunction]] and vascular [[inflammation]] may also contribute to increased peripheral resistance and vascular damage in hypertension. [[Interleukin 17]] has garnered interest for its role in increasing the production of several other [[cytokine|immune system chemical signals]] thought to be involved in hypertension such as [[tumor necrosis factor alpha]], [[interleukin 1]], [[interleukin 6]], and [[interleukin 8]].

Excessive sodium or insufficient [[potassium]] in the diet leads to excessive intracellular sodium, which contracts vascular smooth muscle, restricting blood flow and so increases blood pressure.

==Diagnosis==
Hypertension is diagnosed on the basis of a persistently high resting blood pressure. The [[American Heart Association]] (AHA) recommends at least three resting measurements on at least two separate health care visits.

In Britain, 'Blood Pressure UK'  states that a healthy blood pressure is any reading between 90/60mmHg and 120/80mmHg.

=== Measurement technique ===
For an accurate diagnosis of hypertension to be made, it is essential for proper [[blood pressure measurement]] technique to be used. Improper measurement of blood pressure is common and can change the blood pressure reading by up to 10 mmHg, which can lead to misdiagnosis and misclassification of hypertension. Correct blood pressure measurement technique involves several steps. Proper blood pressure measurement requires the person whose blood pressure is being measured to sit quietly for at least five minutes which is then followed by application of a properly fitted blood pressure cuff to a bare upper arm. The person should be seated with their back supported, feet flat on the floor, and with their legs uncrossed. The person whose blood pressure is being measured should avoid talking or moving during this process. The arm being measured should be supported on a flat surface at the level of the heart. Blood pressure measurement should be done in a quiet room so the medical professional checking the blood pressure can hear the [[Korotkoff sound]]s while listening to the [[brachial artery]] with a [[stethoscope]] for accurate blood pressure measurements. The blood pressure cuff should be deflated slowly (2–3 mmHg per second) while listening for the Korotkoff sounds. The [[urinary bladder|bladder]] should be emptied before a person's blood pressure is measured since this can increase blood pressure by up to 15/10 mmHg. Multiple blood pressure readings (at least two) spaced 1–2 minutes apart should be obtained to ensure accuracy. Ambulatory blood pressure monitoring over 12 to 24 hours is the most accurate method to confirm the diagnosis. An exception to this is those with very high blood pressure readings especially when there is poor [[organ (anatomy)|organ]] function.

With the availability of 24-hour [[ambulatory blood pressure]] monitors and [[bloodpressure#Home monitoring|home blood pressure]] machines, the importance of not wrongly diagnosing those who have [[white coat hypertension]] has led to a change in protocols. In the United Kingdom, current best practice is to follow up a single raised clinic reading with ambulatory measurement, or less ideally with home blood pressure monitoring over the course of 7 days. The [[United States Preventive Services Task Force]] also recommends getting measurements outside of the healthcare environment. [[Pseudohypertension in the elderly]] or noncompressibility artery syndrome may also require consideration. This condition is believed to be due to [[calcification]] of the arteries resulting in abnormally high blood pressure readings with a blood pressure cuff while intra arterial measurements of blood pressure are normal. [[Orthostatic hypertension]] is when blood pressure increases upon standing.

=== Other investigations ===
{{anchor|Laboratory tests}}
{| class="wikitable" style = "float: right; margin-left:15px; text-align:center"
|-
|+ Typical tests performed
! System
! Tests
|-
| [[Urinary system|Kidney]]
| [[Urinalysis|Microscopic urinalysis]], [[proteinuria|protein in the urine]], [[blood urea nitrogen|BUN]], [[creatinine]]
|-
| [[Endocrine system|Endocrine]]
| Serum [[sodium]], [[potassium]], [[calcium]], [[Thyroid-stimulating hormone|TSH]]
|-
| [[Metabolic]]
| [[Glucose test|Fasting blood glucose]], [[High-density lipoprotein|HDL]], [[LDL]], total cholesterol, [[triglycerides]]
|-
| Other
| [[Hematocrit]], [[electrocardiogram]], [[chest radiograph]]
|}

Once the diagnosis of hypertension has been made, healthcare providers should attempt to identify the underlying cause based on risk factors and other symptoms, if present. [[Secondary hypertension]] is more common in preadolescent children, with most cases caused by [[kidney disease]]. Primary or [[essential hypertension]] is more common in adolescents and adults and has multiple risk factors, including obesity and a family history of hypertension. Laboratory tests can also be performed to identify possible causes of secondary hypertension, and to determine whether hypertension has caused damage to the [[Human heart|heart]], [[Human eyes|eyes]], and [[kidney]]s. Additional tests for [[diabetes]] and [[high cholesterol]] levels are usually performed because these conditions are additional risk factors for the development of [[heart disease]] and may require treatment.

Initial assessment of the hypertensive people should include a complete [[Medical history|history]] and [[physical examination]]. Serum [[creatinine]] is measured to assess for the presence of kidney disease, which can be either the cause or the result of hypertension. Serum creatinine alone may overestimate [[glomerular filtration rate]] and the 2003 JNC7 guidelines advocate the use of predictive equations such as the [[Modification of Diet in Renal Disease]] (MDRD) formula to estimate glomerular filtration rate (eGFR). eGFR can also provide a baseline measurement of kidney function that can be used to monitor for side effects of certain [[Antihypertensive drug|anti-hypertensive]] drugs on kidney function. Additionally, testing of urine samples for [[proteinuria|protein]] is used as a secondary indicator of kidney disease. [[Electrocardiogram]] (EKG/ECG) testing is done to check for evidence that the heart is under strain from high blood pressure. It may also show whether there is thickening of the heart muscle ([[left ventricular hypertrophy]]) or whether the heart has experienced a prior minor disturbance such as a silent heart attack. A [[chest X-ray]] or an [[echocardiogram]] may also be performed to look for signs of heart enlargement or damage to the heart.

===Classification in adults===
{| class="wikitable"
|+ Blood pressure classifications
|-
! Categories
! colspan=2 | [[Systolic blood pressure]], [[mmHg]]
! rowspan=2 | And/or
! colspan=2 | [[Diastolic blood pressure]], mmHg
|-
! Method
! Office
! 24h [[Ambulatory blood pressure|ambulatory]]
! Office
! 24h ambulatory
|-
| [[Hypotension]]
| <110
| <100
| or
| <70
| <60
|-
! colspan=6 | [[American College of Cardiology]]/[[American Heart Association]] (2017)
|-
| Normal
| <120
| <115
| and
| <80
| <75
|-
| Elevated
| 120–129
| 115–124
| and
| <80
| <75
|-
| Hypertension, stage 1
| 130–139
| 125–129
| or
| 80–89
| 75–79
|-
| Hypertension, stage 2
| ≥140
| ≥130
| or
| ≥90
| ≥80
|-
! colspan=6 | [[European Society of Hypertension]] (2023)
|-
| Optimal
| <120
| {{N/A}}
| and
| <80
| {{N/A}}
|-
| Normal
| 120–129
| {{N/A}}
| and/or
| 80–84
| {{N/A}}
|-
| High normal
| 130–139
| {{N/A}}
| and/or
| 85–89
| {{N/A}}
|-
| Hypertension, grade 1
| 140–159
| ≥130
| and/or
| 90–99
| ≥80
|-
| Hypertension, grade 2
| 160–179
| {{N/A}}
| and/or
| 100–109
| {{N/A}}
|-
| Hypertension, grade 3
| ≥180
| {{N/A}}
| and/or
| ≥110
| {{N/A}}
|}
[[File:hypertension_chart.svg|thumb|Diastolic vs systolic blood pressure chart comparing European Society of Cardiology and European Society of Hypertension classification with reference ranges in children]]

In people aged 18 years or older, hypertension is defined as either a systolic or a diastolic blood pressure measurement consistently higher than an accepted normal value (this is above 129 or 139&nbsp;mmHg systolic, 89&nbsp;mmHg diastolic depending on the guideline). Lower thresholds are used if measurements are derived from 24-hour [[Ambulatory blood pressure|ambulatory]] or home monitoring.

===Children===
Hypertension occurs in around 0.2 to 3% of newborns; however, blood pressure is not measured routinely in healthy newborns. Hypertension is more common in high risk newborns. A variety of factors, such as [[Gestational age (obstetrics)|gestational age]], postconceptional age and [[birth weight]] needs to be taken into account when deciding if a blood pressure is normal in a newborn.

Hypertension defined as elevated blood pressure over several visits affects 1% to 5% of children and adolescents and is associated with long-term risks of ill-health. Blood pressure rises with age in childhood and, in children, hypertension is defined as an average systolic or diastolic blood pressure on three or more occasions equal or higher than the 95th percentile appropriate for the sex, age and height of the child. High blood pressure must be confirmed on repeated visits however before characterizing a child as having hypertension. Prehypertension in children has been defined as average systolic or diastolic blood pressure that is greater than or equal to the 90th percentile, but less than the 95th percentile. In adolescents, it has been proposed that hypertension and pre-hypertension are diagnosed and classified using the same criteria as in adults.

High blood pressure is frequently encountered in pediatric emergency and outpatient clinics, one of the simplest and reliable methods to assess the need for referral and or further action is the score developed by Elbaba M., published in 2018. The score is composed of a set of 10 items with grades 1, 2 or 3 for each item. The author assumed the mid score of 15 or less is not associated with true hypertension, it can be reactive, white-coat or unreliable measurement. And the score of 16 or above reflects a warning alarm to true hypertension that usually require monitoring, investigations and or treatment.

==Prevention==
Much of the disease burden of high blood pressure is experienced by people who are not labeled as hypertensive. Consequently, population strategies are required to reduce the consequences of high blood pressure and reduce the need for antihypertensive medications. Lifestyle changes are recommended to lower blood pressure, before starting medications. The 2004 British Hypertension Society guidelines proposed lifestyle changes consistent with those outlined by the US National High BP Education Program in 2002 for the primary prevention of hypertension:
* maintain normal body weight for adults (e.g. [[body mass index]] 20–25&nbsp;kg/m<sup>2</sup>)
* reduce dietary sodium intake to <100&nbsp;mmol/ day (<6 g of sodium chloride or <2.4 g of sodium per day)
* engage in regular aerobic physical activity such as brisk walking (≥30 min per day, most days of the week)
* limit alcohol consumption to no more than 3 units/day in men and no more than 2 units/day in women
* consume a diet rich in fruit and vegetables (e.g. at least five portions per day);
* stress reduction
Avoiding or learning to manage stress can help a person control blood pressure.

A few relaxation techniques that can help relieve stress are:
* meditation
* warm baths
* yoga
* going on long walks

Effective lifestyle modification may lower blood pressure as much as an individual antihypertensive medication. Combinations of two or more lifestyle modifications can achieve even better results. There is considerable evidence that reducing dietary salt intake lowers blood pressure, but whether this translates into a reduction in mortality and cardiovascular disease remains uncertain. Estimated sodium intake ≥6g/day and <3g/day are both associated with high risk of death or major cardiovascular disease, but the association between high sodium intake and adverse outcomes is only observed in people with hypertension. Consequently, in the absence of results from randomized controlled trials, the wisdom of reducing levels of dietary salt intake below 3g/day has been questioned. ESC guidelines mention [[periodontitis]] is associated with poor cardiovascular health status.

The value of routine screening for hypertension is debated. In 2004, the National High Blood Pressure Education Program recommended that children aged 3 years and older have blood pressure measurement at least once at every health care visit and the [[National Heart, Lung, and Blood Institute]] and [[American Academy of Pediatrics]] made a similar recommendation. However, the [[American Academy of Family Physicians]] supports the view of the [[United States Preventive Services Task Force|U.S. Preventive Services Task Force]] that the available evidence is insufficient to determine the balance of benefits and harms of screening for hypertension in children and adolescents who do not have symptoms. The US Preventive Services Task Force recommends screening adults 18 years or older for hypertension with office blood pressure measurement.

==Management==
{{Main|Management of hypertension}}
According to one review published in 2003, reduction of the [[blood pressure]] by 5&nbsp;mmHg can decrease the risk of stroke by 34%, of [[ischemic heart disease]] by 21%, and reduce the likelihood of [[dementia]], [[heart failure]], and [[death|mortality]] from [[cardiovascular disease]].

=== Target blood pressure ===
{{See also|Comparison of international blood pressure guidelines}}

Various expert groups have produced guidelines regarding how low the blood pressure target should be when a person is treated for hypertension. These groups recommend a target below the range 140–160 / 90–100 mmHg for the general population. [[Cochrane (organisation)|Cochrane]] reviews recommend similar targets for subgroups such as people with diabetes and people with prior cardiovascular disease. Additionally, Cochrane reviews have found that for older individuals with moderate to high cardiovascular risk, the benefits of trying to achieve a lower than standard blood pressure target (at or below 140/90 mmHg) are outweighed by the risk associated with the intervention. These findings may not be applicable to other populations.

Many expert groups recommend a slightly higher target of 150/90 mmHg for those over somewhere between 60 and 80 years of age. The JNC-8 and [[American College of Physicians]] recommend the target of 150/90 mmHg for those over 60 years of age, but some experts within these groups disagree with this recommendation. Some expert groups have also recommended slightly lower targets in those with diabetes or chronic kidney disease with [[proteinuria|protein loss in the urine]], but others recommend the same target as for the general population. The issue of what is the best target and whether targets should differ for high risk individuals is unresolved, although some experts propose more intensive blood pressure lowering than advocated in some guidelines.

For people who have never experienced cardiovascular disease who are at a 10-year risk of cardiovascular disease of less than 10%, the 2017 American Heart Association guidelines recommend medications if the systolic blood pressure is >140 mmHg or if the diastolic BP is >90 mmHg. For people who have experienced cardiovascular disease or those who are at a 10-year risk of cardiovascular disease of greater than 10%, it recommends medications if the systolic blood pressure is >130 mmHg or if the diastolic BP is >80 mmHg.

===Lifestyle modifications===
The first line of treatment for hypertension is lifestyle changes, including dietary changes, physical activity, and weight loss. Though these have all been recommended in scientific advisories, a [[Cochrane (organisation)|Cochrane]] systematic review found no evidence (due to lack of data) for effects of weight loss diets on death, long-term complications or adverse events in persons with hypertension. The review did find a decrease in body weight and blood pressure. Their potential effectiveness is similar to and at times exceeds a single medication. If hypertension is high enough to justify immediate use of medications, lifestyle changes are still recommended in conjunction with medication.

Dietary changes shown to reduce blood pressure include diets with low sodium, the [[DASH diet]] (Dietary Approaches to Stop Hypertension), which was the best against 11 other diet in an umbrella review, and plant-based diets. There is some evidence [[green tea]] consumption may help lower blood pressure, but this is insufficient for it to be recommended as a treatment. There is evidence from randomized, double-blind, placebo-controlled clinical trials that [[Hibiscus tea]] consumption significantly reduces systolic blood pressure (-4.71 mmHg, 95% CI [-7.87, -1.55]) and diastolic blood pressure (−4.08 mmHg, 95% CI [-6.48, −1.67]). [[Beetroot|Beetroot juice]] consumption also significantly lowers the blood pressure of people with high blood pressure.

Increasing [[Potassium#Nutrition|dietary potassium]] has a potential benefit for lowering the risk of hypertension. The 2015 Dietary Guidelines Advisory Committee (DGAC) stated that potassium is one of the shortfall nutrients which is under-consumed in the United States. However, people who take certain antihypertensive medications (such as ACE-inhibitors or ARBs) should not take potassium supplements or potassium-enriched salts due to the risk of high levels of potassium.

Physical exercise regimens which are shown to reduce blood pressure include [[isometric exercise|isometric resistance exercise]], [[aerobic exercise]], [[resistance exercise]], and device-guided breathing.

Stress reduction techniques such as [[biofeedback]] or [[transcendental meditation]] may be considered as an add-on to other treatments to reduce hypertension, but do not have evidence for preventing cardiovascular disease on their own. Self-monitoring and appointment reminders might support the use of other strategies to improve blood pressure control, but need further evaluation.

===Medications===
Several classes of medications, collectively referred to as [[antihypertensive drug|antihypertensive medication]]s, are available for treating hypertension.

First-line medications for hypertension include [[Thiazide|thiazide-diuretics]], [[calcium channel blockers]], [[angiotensin converting enzyme inhibitor]]s (ACE inhibitors), and [[Angiotensin II receptor blocker|angiotensin receptor blockers]] (ARBs). These medications may be used alone or in combination (ACE inhibitors and ARBs are not recommended for use together); the latter option may serve to minimize counter-regulatory mechanisms that act to restore blood pressure values to pre-treatment levels, although the evidence for first-line combination therapy is not strong enough. Most people require more than one medication to control their hypertension. Medications for blood pressure control should be implemented by a stepped care approach when target levels are not reached. Withdrawal of such medications in the elderly can be considered by healthcare professionals,  because there is no strong evidence of an effect on mortality, [[myocardial infarction]], or [[stroke]].

Previously, [[beta-blockers]] such as [[atenolol]] were thought to have similar beneficial effects when used as first-line therapy for hypertension. However, a Cochrane review that included 13 trials found that the effects of beta-blockers are inferior to that of other antihypertensive medications in preventing cardiovascular disease.

The prescription of antihypertensive medication for children with hypertension has limited evidence. There is limited evidence which compare it with placebo and shows modest effect to blood pressure in short term. Administration of higher dose did not make the reduction of blood pressure greater.

===Resistant hypertension===
Resistant hypertension is defined as high blood pressure that remains above a target level, in spite of being prescribed three or more antihypertensive drugs simultaneously with different [[mechanism of action|mechanisms of action]]. [[Adherence (medicine)|Failing to take prescribed medications as directed]] is an important cause of resistant hypertension. Resistant hypertension may also result from chronically high activity of the [[autonomic nervous system]], an effect known as ''neurogenic hypertension''. Electrical therapies that stimulate the [[baroreflex]] are being studied as an option for lowering blood pressure in people in this situation.

Some common secondary causes of resistant hypertension include [[obstructive sleep apnea]], [[pheochromocytoma]], [[renal artery stenosis]], [[coarctation of the aorta]], and [[primary aldosteronism]]. As many as one in five people with resistant hypertension have primary aldosteronism, which is a treatable and sometimes curable condition.

=== Refractory hypertension ===
{{Main|Refractory hypertension}}

Refractory hypertension is characterized by uncontrolled elevated [[blood pressure]] unmitigated by five or more antihypertensive agents of different classes, including a long-acting [[thiazide-like diuretic]], a [[calcium channel blocker]], and a blocker of the [[renin-angiotensin system]]. People with refractory hypertension typically have increased sympathetic nervous system activity, and are at high risk for more severe cardiovascular diseases and all-cause mortality.

===Non-modulating===
Non-modulating essential hypertension is a form of [[salt]]-sensitive hypertension, where [[sodium]] intake does not modulate either [[Adrenal gland|adrenal]] or [[Kidney|renal]] [[Vascular system|vascular]] responses to [[angiotensin II]]. Individuals with this subset have been termed non-modulators. They make up 25–30% of the hypertensive population.

==Epidemiology==
[[File:Hypertension World Map Men 2014.png|thumb|upright=1.5|Rates of hypertension in adult men in 2014]]
[[File:Hypertensive heart disease world map - DALY - WHO2004.svg|thumb|upright=1.5|[[Disability-adjusted life year]] for [[hypertensive heart disease]] per 100,000&nbsp;inhabitants in 2004:
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{{legend|#ffff65|<110}}
{{legend|#fff200|110–220}}
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{{legend|#ffc600|330–440}}
{{legend|#ffb000|440–550}}
{{legend|#ff9a00|550–660}}
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{{legend|#ff8400|660–770}}
{{legend|#ff6e00|770–880}}
{{legend|#ff5800|880–990}}
{{legend|#ff4200|990–1100}}
{{legend|#ff2c00|1100–1600}}
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{{col-end}}]]

===Adults===
{{As of|2019}}, at least 1 billion 278 million adults aged 30–79 worldwide (over 16% of [[world population]]), including 626 million women and 652 million men, were estimated to have hypertension. This is approximately 278 million up from 2014 and almost double compared to year 1990, when there were estimated 648 million adults in the same age group living with the condition worldwide.

Hypertension is ''slightly'' more frequent in men, in those of low [[socioeconomic status]], and it becomes more common with age. It is common in high, medium, and low-income countries. In 2004, rates of high blood pressure were highest in Africa (30% for both sexes), and lowest in the Americas (18% for both sexes). Rates also vary markedly within regions with country-level rates as low as 22.8% (men) and 18.4% (women) in Peru and as high as 61.6% (men) and 50.9% (women) in Paraguay. Rates in Africa were about 45% in 2016.

In Europe, hypertension occurs in about 30–45% of people {{as of|2013|lc=y}}. In 1995 it was estimated that 43 million people (24% of the population) in the United States had hypertension or were taking antihypertensive medication. By 2004 this had increased to 29% and further to 32% (76&nbsp;million US adults) by 2017. In 2017, with the change in definitions for hypertension, 46% of people in the United States are affected. African-American adults in the United States have among the highest rates of hypertension in the world at 44%. It is also more common in [[Filipino Americans]] and less common in US [[European Americans|whites]] and [[Mexican American]]s. Differences in hypertension rates are multifactorial and under study.

===Children===
Rates of high blood pressure in children and adolescents have increased in the last 20 years in the United States. Childhood hypertension, particularly in pre-adolescents, is more often secondary to an underlying disorder than in adults. Kidney disease is the most common secondary cause of hypertension in children and adolescents. Nevertheless, primary or essential hypertension accounts for most cases.

==Prognosis==
{{Main|Complications of hypertension}}
[[File:Main complications of persistent high blood pressure.svg|thumb|upright=1.4|Diagram illustrating the main complications of persistent high blood pressure]]
Hypertension is the most important [[List of preventable causes of death|preventable risk factor for premature death]] worldwide. It increases the risk of [[ischemic heart disease]], [[strokes]], [[peripheral vascular disease]], and other cardiovascular diseases, including [[heart failure]], [[aortic aneurysm]]s, diffuse [[atherosclerosis]], [[chronic kidney disease]], [[atrial fibrillation]], [[cancer]]s, [[leukemia]] and [[pulmonary embolism]]. Hypertension is also a risk factor for [[cognitive impairment]] and [[dementia]]. Other complications include [[hypertensive retinopathy]] and [[hypertensive nephropathy]].

==History==
{{Main|History of hypertension}}
[[File:William Harvey ( 1578-1657) Venenbild.jpg|Image of veins from Harvey's ''Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus''|left|thumb]]

===Measurement===
Modern understanding of the cardiovascular system began with the work of physician [[William Harvey]] (1578–1657), who described the circulation of blood in his book "''De motu cordis''". The English clergyman [[Stephen Hales]] made the first published measurement of blood pressure in 1733. However, hypertension as a clinical entity came into its own with the invention of the cuff-based [[sphygmomanometer]] by [[Scipione Riva-Rocci]] in 1896. This allowed easy measurement of systolic pressure in the clinic. In 1905, [[Nikolai Korotkoff]] improved the technique by describing the [[Korotkoff sounds]] that are heard when the artery is ausculted with a stethoscope while the sphygmomanometer cuff is deflated. This permitted systolic and diastolic pressure to be measured.

===Identification===
The symptoms similar to symptoms of patients with hypertensive crisis are discussed in medieval Persian medical texts in the chapter of "fullness disease". The symptoms include headache, heaviness in the head, sluggish movements, general redness and warm to touch feel of the body, prominent, distended and tense vessels, fullness of the pulse, distension of the skin, coloured and dense urine, loss of appetite, weak eyesight, impairment of thinking, yawning, drowsiness, vascular rupture, and hemorrhagic stroke. Fullness disease was presumed to be due to an excessive amount of blood within the blood vessels.

Descriptions of hypertension as a disease came among others from [[Thomas Young (scientist)|Thomas Young]] in 1808 and especially [[Richard Bright (physician)|Richard Bright]] in 1836. The first report of elevated blood pressure in a person without evidence of kidney disease was made by [[Frederick Akbar Mahomed]] (1849–1884).

Until the 1990s, systolic hypertension was defined as systolic blood pressure of 160 mm Hg or greater. In 1993, the WHO/ISH guidelines defined 140 mmHg as the threshold for hypertension.

===Treatment===
Historically the treatment for what was called the "hard pulse disease" consisted in reducing the quantity of blood by [[bloodletting]] or the application of [[leech]]es. This was advocated by The [[Yellow Emperor]] of China, [[Aulus Cornelius Celsus|Cornelius Celsus]], [[Galen]], and [[Hippocrates]]. The therapeutic approach for the treatment of hard pulse disease included changes in lifestyle (staying away from anger and [[sexual intercourse]]) and dietary program for patients (avoiding the consumption of [[wine]], meat, and pastries, reducing the volume of food in a meal, maintaining a low-energy diet and the dietary usage of [[spinach]] and [[vinegar]]).

In the 19th and 20th centuries, before effective pharmacological treatment for hypertension became possible, three treatment modalities were used, all with numerous side-effects: strict sodium restriction (for example the [[rice diet]]), [[sympathectomy]] (surgical ablation of parts of the [[sympathetic nervous system]]), and pyrogen therapy (injection of substances that caused a fever, indirectly reducing blood pressure).

The first chemical for hypertension, [[sodium thiocyanate]], was used in 1900 but had many side effects and was unpopular. Several other agents were developed after the [[World War II|Second World War]], the most popular and reasonably effective of which were [[tetramethylammonium chloride]], [[hexamethonium]], [[hydralazine]], and [[reserpine]] (derived from the medicinal plant ''[[Rauvolfia serpentina]]''). None of these were well tolerated. A major breakthrough was achieved with the discovery of the first well-tolerated orally available agents. The first was [[chlorothiazide]], the first [[thiazide]] [[diuretic]] and developed from the antibiotic [[sulfanilamide]], which became available in 1958. Subsequently, [[beta blocker]]s, [[calcium channel blockers]], [[angiotensin converting enzyme]] (ACE) inhibitors, [[angiotensin receptor blockers]], and [[renin inhibitors]] were developed as antihypertensive agents.

==Society and culture==

===Awareness===
[[File:HTNstudyupd.png|thumb|upright=1.4|Graph showing, prevalence of awareness, treatment and control of hypertension compared between the four studies of [[National Health and Nutrition Examination Survey|NHANES]]]]
[[The World Health Organization]] has identified hypertension, or high blood pressure, as the leading cause of [[cardiovascular]] [[Mortality rate|mortality]]. [[The World Hypertension League]] (WHL), an umbrella organization of 85 national hypertension societies and leagues, recognized that more than 50% of the hypertensive population worldwide are unaware of their condition. To address this problem, the WHL initiated a global awareness campaign on hypertension in 2005 and dedicated 17 May of each year as [[World Hypertension Day]] ([[World Hypertension Day|WHD]]). Over the past three years, more national societies have been engaging in WHD and have been innovative in their activities to get the message to the public. In 2007, there was record participation from 47 member countries of the WHL. During the week of WHD, all these countries – in partnership with their local governments, professional societies, nongovernmental organizations and private industries – promoted hypertension awareness among the public through several [[Mass media|media]] and public rallies. Using [[mass media]] such as Internet and television, the message reached more than 250 million people. As the momentum picks up year after year, the WHL is confident that almost all the estimated 1.5 billion people affected by elevated blood pressure can be reached.

===Economics===
High blood pressure is the most common chronic medical problem prompting visits to primary health care providers in US. The American Heart Association estimated the direct and indirect costs of high blood pressure in 2010 as $76.6 billion. In the US 80% of people with hypertension are aware of their condition, 71% take some antihypertensive medication, but only 48% of people aware that they have hypertension adequately control it. Adequate management of hypertension can be hampered by inadequacies in the diagnosis, treatment, or control of high blood pressure. [[Health care providers]] face many obstacles to achieving blood pressure control, including resistance to taking multiple medications to reach blood pressure goals. People also face the challenges of adhering to medicine schedules and making lifestyle changes. Nonetheless, the achievement of blood pressure goals is possible, and most importantly, lowering blood pressure significantly reduces the risk of death due to heart disease and stroke, the development of other debilitating conditions, and the cost associated with advanced medical care.

==Other animals==
Hypertension in cats is indicated with a systolic blood pressure greater than 150&nbsp;mmHg, with [[amlodipine]] the usual first-line treatment. A cat with a systolic blood pressure above 170 mmHg is considered hypertensive. If a cat has other problems such as any kidney disease or retina detachment then a blood pressure below 160&nbsp;mm HG may also need to be monitored.

Normal blood pressure in dogs can differ substantially between breeds but hypertension is often diagnosed if systolic blood pressure is above 160&nbsp;mmHg particularly if this is associated with target organ damage. Inhibitors of the renin-angiotensin system and calcium channel blockers are often used to treat hypertension in dogs, although other drugs may be indicated for specific conditions causing high blood pressure.

== Further reading ==
{{refbegin}}
* {{cite journal | vauthors = James PA, Oparil S, Carter BL, Cushman WC, Dennison-Himmelfarb C, Handler J, etal | title = 2014 evidence-based guideline for the management of high blood pressure in adults: report from the panel members appointed to the Eighth Joint National Committee (JNC 8) | journal = JAMA | volume = 311 | issue = 5 | pages = 507–20 | date = February 2014 | pmid = 24352797 | doi = 10.1001/jama.2013.284427 | doi-access = free }}
{{refend}}


{{Commons category|Hypertension}}
{{Wikivoyage|Traveling with high blood pressure|traveling with high blood pressure|information}}

{{Medical condition classification and resources
|  DiseasesDB     = 6330
|  ICD11          = {{ICD11|BA00}}
|  ICD10          = {{ICD10|I10}}
|  ICD9           = {{ICD9|401}}
|  OMIM           = 145500
|  MedlinePlus    = 000468
|  eMedicineSubj  = med
|  eMedicineTopic = 1106
|  eMedicine_mult = {{eMedicine2|ped|1097}} {{eMedicine2|emerg|267}}
|  MeshID         = D006973
|  Curlie         = Health/Conditions_and_Diseases/Cardiovascular_Disorders/Hypertension/
}}

{{Vascular diseases}}
{{Portal bar|Biology|Medicine}}

{{二次利用|date=25 February 2024}}
[[Category:Hypertension| ]]
[[Category:Blood pressure]]
[[Category:Medical conditions related to obesity]]
[[Category:Wikipedia medicine articles ready to translate (full)]]
[[Category:Wikipedia neurology articles ready to translate]]
[[Category:Articles containing video clips]]