Hypertension (High Blood Pressure)

Hypertension, commonly known as high blood pressure, is a chronic cardiovascular condition in which the force of blood against the artery walls is consistently too high. Blood pressure is measured in millimeters of mercury (mmHg) and recorded as two numbers: systolic pressure (the force when the heart beats) over diastolic pressure (the force when the heart rests between beats). Normal blood pressure is below 120/80 mmHg. Elevated blood pressure is defined as systolic readings of 120 to 129 mmHg with diastolic below 80 mmHg, while stage 1 hypertension is 130 to 139 systolic or 80 to 89 diastolic, and stage 2 hypertension is 140/90 mmHg or higher. Hypertension is often called the "silent killer" because it typically produces no noticeable symptoms until it has caused significant organ damage. An estimated 1.28 billion adults worldwide have hypertension, yet nearly half are unaware of their condition. Over time, the sustained pressure damages the inner lining of blood vessels, promoting atherosclerosis (plaque buildup), and forces the heart to work harder. This can lead to heart attack, stroke, heart failure, kidney disease, vision loss, and vascular dementia. Hypertension is the single largest contributor to global cardiovascular mortality. The good news is that hypertension is highly manageable. Regular blood pressure monitoring, ideally at home as well as at clinical visits, is essential for detection and ongoing management. Treatment typically involves a combination of lifestyle modifications and, when needed, antihypertensive medications. Studies consistently show that reducing blood pressure by even a modest amount significantly lowers the risk of heart attack, stroke, and kidney failure.

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Last reviewed: April 7, 2026

Last reviewed: April 7, 2026. Educational content only. Source approach: general clinical reference material, public-health guidance, and standard symptom-and-condition explainer context where appropriate.

Symptoms

  • Often asymptomatic (the "silent killer") until organ damage occurs
  • Headaches, particularly in the morning (more common with severely elevated blood pressure)
  • Dizziness or lightheadedness
  • Shortness of breath during exertion
  • Nosebleeds (more frequent but not necessarily caused by hypertension)
  • Visual changes or blurred vision
  • Chest pain or a feeling of tightness
  • Facial flushing

Causes

  • Primary (essential) hypertension: no single identifiable cause, develops gradually from a combination of genetic, environmental, and lifestyle factors
  • Secondary hypertension: caused by an underlying condition such as kidney disease, adrenal gland tumors, thyroid disorders, or obstructive sleep apnea
  • Excessive dietary sodium intake leading to fluid retention and increased blood volume
  • Chronic activation of the renin-angiotensin-aldosterone system (RAAS), which regulates blood pressure
  • Endothelial dysfunction and stiffening of arterial walls

Risk Factors

  • Age (risk increases significantly after age 50 as arteries become stiffer)
  • Family history of hypertension
  • Overweight or obesity, especially with excess abdominal fat
  • High-sodium, low-potassium diet
  • Physical inactivity
  • Excessive alcohol consumption and tobacco use

Treatment Options

ACE Inhibitors and ARBs

Angiotensin-converting enzyme (ACE) inhibitors (lisinopril, enalapril, ramipril) and angiotensin II receptor blockers (ARBs) such as losartan and valsartan are first-line medications that relax blood vessels by blocking the renin-angiotensin system. They are particularly beneficial for patients with diabetes, chronic kidney disease, or heart failure. ACE inhibitors may cause a dry cough in some patients, in which case ARBs are a well-tolerated alternative.

Calcium Channel Blockers

Medications such as amlodipine, nifedipine, and diltiazem reduce blood pressure by preventing calcium from entering heart and blood vessel muscle cells, causing them to relax. They are effective as monotherapy and in combination with other antihypertensives. Common side effects include ankle swelling, constipation, and headache.

Thiazide Diuretics

Thiazide and thiazide-like diuretics (hydrochlorothiazide, chlorthalidone, indapamide) lower blood pressure by reducing blood volume through increased urinary sodium and water excretion. They are among the most studied and cost-effective antihypertensive medications. Electrolyte levels, particularly potassium, should be monitored regularly during treatment.

DASH Diet

The Dietary Approaches to Stop Hypertension (DASH) diet emphasizes fruits, vegetables, whole grains, lean proteins, and low-fat dairy while limiting sodium, saturated fat, and added sugars. Clinical trials have shown that the DASH diet can reduce systolic blood pressure by 8 to 14 mmHg. Combining DASH with sodium restriction to less than 1,500 mg per day provides even greater blood pressure reductions.

Regular Physical Activity

Engaging in at least 150 minutes per week of moderate-intensity aerobic exercise, such as brisk walking, cycling, or swimming, can lower systolic blood pressure by 5 to 8 mmHg. Resistance training two to three times per week provides additional benefits. Exercise helps by improving vascular function, reducing arterial stiffness, and aiding weight management.

Sodium Reduction and Weight Management

Reducing sodium intake to less than 2,300 mg per day (ideally under 1,500 mg) can lower blood pressure by 2 to 8 mmHg. Losing even 5 to 10 percent of body weight can produce clinically meaningful blood pressure reductions. Other lifestyle measures include limiting alcohol to one drink per day for women and two for men, quitting smoking, and managing stress.

Frequently Asked Questions

Hypertension earns this label because it rarely produces noticeable symptoms in its early and moderate stages, even as it steadily damages blood vessels and organs. Many people feel perfectly healthy despite having dangerously elevated blood pressure for years or even decades. By the time symptoms appear, such as severe headaches, chest pain, or vision problems, significant organ damage may have already occurred, including thickening of the heart muscle, kidney impairment, or atherosclerosis. This is why regular blood pressure screening is so important, even for people who feel well.
The American Heart Association recommends that adults with normal blood pressure have it checked at least once every two years during routine healthcare visits. Those with elevated blood pressure or risk factors should be checked annually or more frequently. For people diagnosed with hypertension, home blood pressure monitoring is valuable and often recommended. Taking two to three readings in the morning and evening for a week before a doctor visit provides a more accurate picture than a single office reading, which can be affected by white-coat hypertension or masked hypertension.
Primary (essential) hypertension, which accounts for about 90 to 95 percent of cases, generally cannot be cured but can be effectively controlled with medication and lifestyle changes. Some patients who achieve significant weight loss and adopt sustained healthy habits may be able to reduce or eventually discontinue medication under medical supervision, though continued monitoring is essential. Secondary hypertension caused by an identifiable condition, such as a kidney problem or adrenal gland tumor, may be resolved or significantly improved by treating the underlying cause.
Acute stress can cause temporary spikes in blood pressure as the body releases adrenaline and cortisol, which increase heart rate and constrict blood vessels. However, the relationship between chronic stress and sustained hypertension is more complex. While chronic stress may contribute to hypertension through behaviors it promotes, such as overeating, poor sleep, excessive alcohol consumption, and physical inactivity, stress alone is not considered a direct cause of chronic hypertension. Managing stress through techniques like meditation, deep breathing, regular exercise, and adequate sleep can support overall cardiovascular health and complement blood pressure treatment.
White-coat hypertension refers to blood pressure readings that are elevated in a clinical setting (such as a doctor's office) but normal when measured at home or during daily activities. It affects an estimated 15 to 30 percent of people diagnosed with hypertension. While once considered benign, research now suggests that white-coat hypertension may carry a slightly increased cardiovascular risk compared to truly normal blood pressure. Ambulatory blood pressure monitoring (wearing a portable device for 24 hours) or regular home monitoring can help distinguish white-coat hypertension from sustained hypertension, ensuring appropriate treatment decisions.

Relevant tests & biomarkers

These lab markers may be relevant when evaluating hypertension (high blood pressure) or related symptoms.

CrCreatinine

Understand creatinine blood test results. Learn what creatinine measures, normal ranges, causes of high and low levels, and its role in assessing kidney function.

BUNBlood Urea Nitrogen

Learn about BUN blood test results. Understand normal ranges, causes of high and low levels, and how BUN relates to kidney function.

NaSodium

Understand sodium blood test results. Learn about normal ranges, hypernatremia, hyponatremia, causes, symptoms, and when to test.

KPotassium

Understand potassium blood test results. Learn about normal ranges, hyperkalemia, hypokalemia, causes, symptoms, and cardiac risks.

CaCalcium

Understand calcium blood test results. Learn about normal ranges, hypercalcemia, hypocalcemia, causes, symptoms, and the role of calcium in bone and heart health.

ASTAspartate Aminotransferase

Learn about AST blood test results. Understand normal ranges, causes of elevated AST, the AST/ALT ratio, and what it means for liver and heart health.

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References and review approach

Condition pages are educational summaries that may draw on common clinical framing, public-health guidance, and general medical reference material. For our broader standards on content updates, trust labeling, and review passes, see our Editorial Policy and Content Review Process.

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Medical Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for medical concerns. If you are experiencing a medical emergency, call your local emergency number immediately.

Disclaimer: SymptomGPT is not a medical diagnosis tool and does not provide medical advice. Always consult a qualified healthcare professional. If you are experiencing a medical emergency, call your local emergency number immediately.