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Medically reviewed by the HealthVetted Medical Board
High blood pressure, or hypertension, is the persistent force of blood pushing too hard against the walls of your arteries — a level high enough to strain the heart and blood vessels over time. It is one of the most common chronic conditions in the world, usually causes no symptoms, and is a leading treatable cause of heart attack, stroke, kidney disease, and early death.
Blood pressure is the pressure inside your arteries, measured in millimeters of mercury (mm Hg) and written as two numbers. The top number, systolic pressure, is the pressure when the heart beats and pushes blood out. The bottom number, diastolic pressure, is the pressure when the heart relaxes between beats. A reading of 118/76, for example, is read as "118 over 76."
Pressure rises and falls naturally throughout the day with activity, stress, and sleep. Hypertension (ICD-10 code I10 for primary hypertension) is diagnosed when pressure stays elevated across multiple readings on different occasions — not from a single high number. Because chronically high pressure forces the heart to work harder and damages the inner lining of arteries, it accelerates atherosclerosis and quietly raises the risk of cardiovascular events long before a person feels anything.
Hypertension is extremely common. According to the CDC, nearly half of U.S. adults — about 47.7 percent during 2021–2023 — meet the definition of hypertension under current guidelines, and it is more frequent in men than women (CDC, National Center for Health Statistics). It is often called the "silent killer" because most people have no warning signs, yet it remains one of the most modifiable contributors to serious disease.
In roughly 90–95 percent of cases, no single cause can be identified. This is called primary (essential) hypertension, and it develops gradually over years from a mix of genetics, aging of the arteries, and lifestyle factors (StatPearls; NIH/NHLBI).
A smaller share of people have secondary hypertension, in which an identifiable condition drives the high pressure. Common secondary causes include chronic kidney disease, obstructive sleep apnea, hormonal disorders such as primary aldosteronism and thyroid disease, narrowing of the kidney arteries, and certain medications. Secondary causes are more likely to be suspected when hypertension appears suddenly, is very severe, occurs at a young age, or resists multiple medications.
Risk factors recognized across cardiology and public-health guidance include:
Many of these factors are modifiable, which is why lifestyle change is the foundation of both prevention and treatment.
For most people, the honest answer is none. Hypertension typically produces no symptoms, which is precisely why it is dangerous — many people live with damaging pressure for years without knowing it. Routine screening, not how you feel, is how hypertension is detected.
Common beliefs that high blood pressure causes everyday headaches, nosebleeds, facial flushing, or dizziness are not reliably true; these symptoms occur about as often in people with normal pressure. Relying on symptoms to gauge blood pressure is unreliable and unsafe.
Symptoms generally appear only when pressure becomes dangerously high or when long-standing hypertension has already damaged organs. Warning signs of a hypertensive crisis (a reading at or above 180/120 mm Hg) can include severe headache, chest pain, shortness of breath, vision changes, confusion, weakness or numbness on one side, or difficulty speaking — these are emergencies (see *When should you see a doctor?* below).
Diagnosis rests on accurate, repeated measurement. A proper reading is taken after the person has rested quietly for about five minutes, sitting with back supported, feet flat on the floor, arm supported at heart level, and an appropriately sized cuff — with no caffeine, exercise, or smoking in the preceding 30 minutes. Because a single high reading can reflect anxiety or "white-coat" effect, guidelines recommend confirming elevated office readings with measurements on separate occasions, and often with home blood pressure monitoring or 24-hour ambulatory blood pressure monitoring (AHA; USPSTF).
The current ACC/AHA guideline (updated in 2025, retaining the thresholds first set in 2017) defines the following categories for adults (American Heart Association / American College of Cardiology):
| Category | Systolic (mm Hg) | Diastolic (mm Hg) | |
|---|---|---|---|
| Normal | Below 120 | and | Below 80 |
| Elevated | 120–129 | and | Below 80 |
| Hypertension Stage 1 | 130–139 | or | 80–89 |
| Hypertension Stage 2 | 140 or higher | or | 90 or higher |
A reading at or above 180/120 mm Hg is a hypertensive crisis and is treated as a separate, urgent situation rather than a routine category (see *When should you see a doctor?* below).
When the systolic and diastolic readings fall into two different categories, the higher category applies — so a reading of 128/82 is classified as Stage 1 hypertension. The 2017 guideline lowered the threshold for Stage 1 from the older 140/90 standard and eliminated the term "prehypertension," and the 2025 update kept these same definitions.
After a diagnosis, clinicians typically order tests to look for causes and for organ damage and to estimate overall cardiovascular risk. These may include blood tests (kidney function, electrolytes, blood glucose, and cholesterol), a urine test, and an electrocardiogram (ECG); additional testing is reserved for suspected secondary causes. The 2025 guideline recommends estimating 10-year cardiovascular risk using the AHA PREVENT equations to help decide who benefits from medication (ACC/AHA).
Treatment is individualized and based on the blood pressure stage plus a person's overall cardiovascular risk, not the numbers alone. The general goal in current guidance is to bring blood pressure below 130/80 mm Hg for most adults, though targets are personalized for those who are pregnant, frail, or have a limited life expectancy (2025 ACC/AHA). Care follows a stepwise path.
For everyone — and as the first step for many people with Stage 1 hypertension at lower cardiovascular risk, who are typically given a 3-to-6-month trial of lifestyle change before medication is considered — lifestyle modification is foundational and can meaningfully lower pressure:
There is no over-the-counter medication that treats hypertension. In fact, some common OTC products can raise blood pressure and should be used cautiously: nonsteroidal anti-inflammatory drugs (NSAIDs such as ibuprofen and naproxen) and many decongestants containing pseudoephedrine or phenylephrine can elevate pressure. People with hypertension should read labels and ask a pharmacist or clinician before regular use.
When lifestyle change is not enough, or when blood pressure is high enough or risk great enough to warrant it, prescription medicines are added. Several well-established first-line drug classes are similarly effective, and many people ultimately need more than one (2025 ACC/AHA):
ACE inhibitors and ARBs should not be used together, and these two classes are avoided in pregnancy. Other classes — including beta-blockers, mineralocorticoid receptor antagonists such as spironolactone, and additional agents — are added for specific situations or harder-to-control (resistant) hypertension. Because hypertension is usually lifelong, medications are taken continuously; they control pressure rather than cure it, and stopping them generally causes pressure to rise again.
Yes — to a meaningful degree. The same lifestyle measures that treat hypertension also help prevent it: maintaining a healthy weight, eating a DASH-style low-sodium diet, staying active, limiting alcohol, not smoking, and getting enough good-quality sleep. Because risk rises with age, these habits matter even for people whose pressure is currently normal.
Long-term management is about consistency. Practical strategies that improve control include monitoring blood pressure at home with a validated upper-arm device and logging the readings, taking medications exactly as prescribed (combination pills can simplify regimens), keeping regular follow-up visits, and treating coexisting conditions such as diabetes and high cholesterol. National data show that control remains a challenge — only about 1 in 5 U.S. adults with hypertension (about 20.7 percent during 2021–2023) had it controlled to below 130/80 mm Hg (CDC, NCHS Data Brief No. 511) — but most of that gap reflects gaps in awareness and adherence, not lack of effective treatment.
Because hypertension is usually silent, every adult should have their blood pressure checked at routine visits and screened on the schedule their clinician recommends. See a doctor to establish or revisit care if home or pharmacy readings are repeatedly 130/80 mm Hg or higher.
Seek emergency care immediately for a reading at or above 180/120 mm Hg, especially if it is accompanied by any of these red flags, which can signal a hypertensive emergency with organ damage:
If a reading is 180/120 or higher but there are no symptoms, current guidance is to rest a few minutes and recheck; if it remains that high, contact a clinician promptly rather than waiting (AHA). Pregnant people with rising blood pressure should be evaluated urgently because of the risk of preeclampsia (ACOG).
The outlook for hypertension is generally very good when it is detected and treated — and this is one of its most important features. Hypertension itself is not curable in most people, but it is highly controllable, and lowering blood pressure clearly reduces the risk of heart attack, stroke, heart failure, kidney disease, and death. Treatment effects are substantial: pooled trial data summarized in the 2025 ACC/AHA guideline indicate that each 10 mm Hg reduction in systolic blood pressure is associated with roughly a 17 percent lower risk of coronary heart disease, a 27 percent lower risk of stroke, and a 13 percent lower risk of death (AHA/ACC).
Left unrecognized or untreated, persistent hypertension damages arteries throughout the body and can lead to coronary artery disease, stroke, heart failure, chronic kidney disease, vision loss, and aneurysm. The encouraging reality is that these outcomes are largely preventable. With consistent treatment and healthy habits, the great majority of people with hypertension live full, normal lives.
Can high blood pressure be cured? For most people, primary hypertension is managed rather than cured. Lifestyle changes and, when needed, medication can bring pressure into a healthy range and keep it there. Some people with early Stage 1 hypertension can normalize their pressure through weight loss, diet, and exercise and may reduce or stop medication under a clinician's guidance — but the underlying tendency usually remains, so monitoring continues for life. Secondary hypertension can sometimes resolve if the underlying cause is corrected.
What is a normal blood pressure reading? Under the current ACC/AHA guideline (the threshold set in 2017 and retained in the 2025 update), a normal reading is below 120/80 mm Hg. Readings of 120–129 over less than 80 are "elevated," and 130/80 or higher meets the definition of hypertension.
Do I have to take medication forever? Often, yes — but not always. Because hypertension is typically a lifelong condition, most people stay on medication long term to keep pressure controlled, since stopping usually allows it to rise again. However, some people who lose significant weight or make major lifestyle changes can lower or discontinue medication with their clinician's supervision. Never stop blood pressure medicine on your own.
Does cutting salt really lower blood pressure? For many people, yes. Reducing sodium intake lowers blood pressure, and the effect tends to be larger in those who are salt-sensitive, including older adults and Black adults. Eating a DASH-style diet that is also rich in potassium amplifies the benefit (NHLBI).
Is high blood pressure dangerous if I feel fine? Yes. The absence of symptoms does not mean the absence of harm — hypertension damages blood vessels silently over years. This is exactly why screening and consistent treatment matter even when you feel completely well.
*This page is for general education and is not medical advice. Talk with a qualified healthcare professional about diagnosis and treatment decisions.*
Under the 2017 ACC/AHA guideline, normal blood pressure is below 120/80 mm Hg. Readings of 120–129 systolic with diastolic under 80 are "elevated." Stage 1 hypertension is 130–139 systolic or 80–89 diastolic, and stage 2 is 140/90 or higher. The CDC defines high blood pressure as readings consistently at or above 130/80 mm Hg.
Primary (essential) hypertension usually cannot be cured, but it can be effectively controlled with lifestyle changes and medication, lowering your long-term risk of heart attack, stroke, and kidney disease. Secondary hypertension may improve or resolve if the underlying cause — such as a thyroid disorder or sleep apnea — is treated. Most people manage blood pressure as an ongoing, lifelong condition.
Most people with high blood pressure have no warning signs, which is why it is called a "silent" condition. Symptoms like headache, shortness of breath, or nosebleeds usually appear only when pressure is very high. Because it can quietly damage the heart, brain, and kidneys for years, the only reliable way to know your numbers is to measure them regularly.
A diagnosis is based on an average of two or more readings taken on two or more separate visits, not a single measurement. Your clinician may also use home monitoring or 24-hour ambulatory monitoring to confirm the diagnosis and rule out anxiety-related "white-coat" spikes. Follow-up tests such as blood work and an ECG help check for causes and organ damage.
Effective steps include following a low-sodium, potassium-rich eating pattern such as the DASH or Mediterranean diet, losing excess weight, getting about 150 minutes of aerobic activity weekly, limiting alcohol, quitting smoking, managing stress, and improving sleep. These changes can meaningfully lower readings and, for some people with mild hypertension, may reduce or delay the need for medication.
A reading of 180/120 mm Hg or higher is dangerous. If it occurs alongside chest pain, shortness of breath, severe headache, vision changes, numbness or weakness, difficulty speaking, or back pain, seek emergency care immediately, as this may signal a hypertensive crisis with organ damage. If the reading is that high but you have no symptoms, recheck after a few minutes and contact your clinician promptly.
This page is for general information and is not medical advice. Always consult a qualified clinician about diagnosis and treatment. Individual results vary.