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Disease

Hypertension (High Blood Pressure)

Learn about hypertension, including its symptoms, diagnosis, laboratory tests, treatment and prevention.

Last Reviewed 27 Jul 2026
Reading Time 8 min read

Overview

Most people with high blood pressure feel completely fine. No headache, no dizziness, no obvious warning sign that something is wrong. That is exactly what makes hypertension one of the more dangerous conditions a person can have without knowing it, and why it is often called the silent killer.

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Key Fact

The WHO African Region has the highest rate of hypertension of any region in the world. In a recent study across 37 African countries, fewer than 1 in 10 men with high blood pressure had it under control. The condition is common and often silent, which is exactly why regular blood pressure checks matter so much.

Warning

A blood pressure reading of 180/120 mmHg or higher, especially alongside chest pain, difficulty breathing, or vision changes, is a hypertensive emergency and needs immediate medical care. If you have never had your blood pressure checked, ask about it at your next visit, even if you feel completely well.

AT A GLANCE

Disease Summary

Category Non-Communicable Disease
Cause A combination of genetic, lifestyle, and health factors that cause the pressure in the blood vessels to remain persistently high
Transmission Not applicable; hypertension is a non-communicable condition and cannot be spread between people
Body System Cardiovascular System
Preventable Yes
Curable No

Symptoms

Common Symptoms

Hypertension usually causes no symptoms at all, which is why it is called the silent killer. The signs below, when they do occur, often only appear with very high or long-standing blood pressure.

Headaches

Can occur with very high blood pressure, though most people with hypertension have no headaches at all.

Shortness of Breath

Can develop with longstanding high blood pressure that has begun to affect the heart.

Nosebleeds

Occasionally associated with very high blood pressure, though this is uncommon.

Dizziness

Can occur, though it is not a reliable sign of high or low blood pressure on its own.

Danger Signs

Seek emergency medical attention immediately if any of the following develop, particularly alongside a very high blood pressure reading.

Severe Headache with Confusion

Can indicate a hypertensive emergency affecting the brain and needs immediate care.

Chest Pain

Can indicate the heart is under severe strain and requires emergency assessment.

Difficulty Breathing

Can indicate the heart is struggling to cope with very high blood pressure.

Sudden Vision Changes

Can indicate the blood vessels in the eyes are being affected and needs prompt evaluation.

Diagnosis

Blood Pressure Measurement

Taken with a cuff on the upper arm, ideally after sitting quietly for a few minutes. A single reading is not enough to diagnose hypertension.

Repeat Measurement on a Different Day

Confirms whether elevated blood pressure is a consistent pattern rather than a one-time reading.

Home or Ambulatory Blood Pressure Monitoring

Tracks blood pressure over a day or more during normal daily life, which can give a more accurate picture than a single clinic visit.
Important
Hypertension is diagnosed when blood pressure readings of 140/90 mmHg or higher are found on two separate days, not from a single high reading, since blood pressure can rise temporarily due to stress, activity, or simply being at a clinic.

Laboratory Tests

Blood Pressure Measurement

The primary way hypertension is diagnosed, confirmed with readings on at least two separate days.

Sample Arm cuff, non-invasive
Time A few minutes

Kidney Function Tests

Checks whether high blood pressure has affected the kidneys, or whether kidney problems may be contributing to it.

Sample Venous blood
Time 24–48 hours

Urine Test

Checks for protein or other signs of kidney involvement.

Sample Urine
Time Same day

Blood Glucose and Cholesterol Tests

Checks for related conditions like diabetes and high cholesterol, which often occur alongside hypertension and add to cardiovascular risk.

Sample Venous blood
Time 24–48 hours

Laboratory Note

These additional tests do not diagnose hypertension itself, blood pressure measurement does that, but they help assess overall cardiovascular risk and check for related conditions or complications.

Treatment

Lifestyle Changes

Reducing salt intake, staying physically active, limiting alcohol, and maintaining a healthy weight can meaningfully lower blood pressure, sometimes enough to avoid needing medication.

Route Diet, physical activity, and other daily habits
Duration Ongoing, lifelong

Blood Pressure-Lowering Medication

Several types of medication can lower blood pressure effectively, often used in combination, particularly when lifestyle changes alone are not enough.

Route Oral
Duration Often long-term, adjusted over time

Treatment Note

Hypertension is a lifelong condition to manage rather than cure. Stopping medication once blood pressure improves usually causes it to rise again, which is why ongoing treatment and monitoring matter, even after blood pressure is well controlled.

Prevention

Reduce salt intake

Keeping daily salt intake low, ideally under 5 grams (about a teaspoon), meaningfully lowers blood pressure over time.

Stay physically active

At least 150 minutes of moderate physical activity each week helps keep blood pressure in a healthy range.

Eat more fruits and vegetables

A diet rich in fruits, vegetables, and whole grains, and lower in saturated fat, supports healthy blood pressure.

Limit alcohol and avoid tobacco

Both raise blood pressure and increase the risk of heart disease over time.

Prevention Note

Hypertension is largely preventable through everyday habits, which is also why regular blood pressure checks matter, since the condition can develop gradually without any noticeable warning.

Risk Factors

Higher Risk

These factors increase the likelihood of developing hypertension.

  • Age, since blood pressure tends to rise over time
  • A family history of hypertension
  • Being overweight or living with obesity

Related Health Conditions

These conditions are linked to a higher risk of hypertension.

  • Diabetes
  • Kidney disease
  • High cholesterol

Lifestyle Factors

Everyday factors that increase risk over time.

  • A diet high in salt and low in fruits and vegetables
  • Limited physical activity
  • Regular alcohol use and tobacco use
  • Chronic stress

Risk Note

The WHO African Region has the highest rate of hypertension in the world, making regular blood pressure checks especially important, even for people who feel completely healthy.

Complications

Heart Attack and Heart Failure

Long-term high blood pressure forces the heart to work harder, which can eventually weaken it or trigger a heart attack.

Stroke

Hypertension is one of the leading causes of stroke, whether from a burst or a blocked blood vessel in the brain.

Kidney Damage

High blood pressure can damage the blood vessels in the kidneys, sometimes leading to kidney failure over time.

Complication Note

Most of these complications build up silently over years of uncontrolled blood pressure, which is exactly why hypertension is called the silent killer, and why regular monitoring matters even without symptoms.

When to Seek Medical Care

A Blood Pressure Reading of 180/120 or Higher

This level needs prompt medical attention, especially if accompanied by other symptoms.

Severe Headache with Confusion or Vision Changes

Can indicate a hypertensive emergency and needs immediate care.

Chest Pain or Difficulty Breathing

Can indicate the heart is under significant strain and requires urgent assessment.

Never Having Had Blood Pressure Checked

Since hypertension usually causes no symptoms, checking your blood pressure regularly matters even when you feel well.

Emergency Advice

Because hypertension is usually silent, routine blood pressure checks, not waiting for symptoms, are the most important way to catch it early.

Prognosis

Highly Manageable With Treatment

Lifestyle changes and, when needed, medication can control blood pressure effectively for most people.

Complications Are Largely Preventable

Consistent blood pressure control substantially lowers the risk of heart attack, stroke, and kidney disease.

Control Requires Ongoing Effort

Because hypertension is a lifelong condition, maintaining healthy habits and, where needed, medication over time matters more than short-term changes.

Prognosis Note

Globally, fewer than 1 in 5 people with hypertension have their blood pressure adequately controlled. Improving this is one of the most effective ways to reduce early death from heart disease and stroke worldwide.

Differential Diagnosis

White Coat Hypertension

Blood pressure that is elevated only in a clinical setting due to anxiety, but normal elsewhere, distinguished through home or ambulatory monitoring.

Secondary Hypertension

High blood pressure caused by an underlying condition, such as kidney disease or a hormonal disorder, rather than developing on its own.

Anxiety or Panic Episodes

Can temporarily raise blood pressure and cause symptoms like a racing heart, distinct from the persistent pattern seen in hypertension.

Clinical Note

Because a single high reading is not enough to diagnose hypertension, repeated measurement over time, and sometimes further testing, helps distinguish true hypertension from these other causes of elevated blood pressure.

References

World Health Organization (WHO)

World Health Organization fact sheet on hypertension prevalence, risk factors, diagnosis, and prevention.

WHO Global Report on Hypertension 2025

WHO’s global report on the burden, detection, treatment, and control of hypertension worldwide.

International Society of Hypertension Global Guidelines (via AAFP)

Summary of global clinical guidelines for hypertension diagnosis and management, including lifestyle and treatment recommendations.

Frequently Asked Questions

Can hypertension be cured?
Hypertension is generally a lifelong condition to manage rather than cure. With consistent lifestyle changes and, when needed, medication, blood pressure can be controlled effectively, but it usually rises again if treatment stops.
Why is hypertension called the silent killer?
Because it usually causes no symptoms at all, even as it quietly damages the heart, blood vessels, kidneys, and brain over years. The only way to know your blood pressure is to have it checked.
What blood pressure reading counts as hypertension?
The World Health Organization defines hypertension as a blood pressure reading of 140/90 mmHg or higher, confirmed on two separate days.
Can I lower my blood pressure without medication?
For some people, especially with modest elevations, lifestyle changes like reducing salt, staying active, and maintaining a healthy weight can bring blood pressure into a normal range. Others need medication alongside these changes.