Blood pressure is the force that a person’s blood exerts against the walls of their blood vessels. This pressure depends on the resistance of the blood vessels and how hard the heart has to work. Your blood pressure measurement takes into account the amount of blood passing through your blood vessels and the amount of resistance the blood meets while the heart is pumping.                                       Blood pressure is written as two numbers. The first (systolic) number represents the pressure in blood vessels when the heart contracts or beats. The second (diastolic) number represents the pressure in the vessels when the heart rests between beat.

High blood pressure, or hypertension, occurs when the force of blood pushing through your vessels is consistently too high.

Narrow arteries create more resistance for blood flow out of the heart. The narrower your arteries, the more resistance there is, and the higher your blood pressure will be.

Hypertension typically develops over several years, usually without causing any symptoms. But even without symptoms, high blood pressure can cause damage to your blood vessels and organs, especially the brain, heart, eyes, and kidneys.

Early detection is important. Regular blood pressure readings can help you and a doctor notice any changes.

Hypertension is blood pressure that is consistently higher than 140 over 90  of mercury (mm Hg). Hypertension is diagnosed if, when it is measured on two different days, the systolic blood pressure readings on both days is ≥140 mmHg and/or the diastolic blood pressure readings on both days is ≥90 mmHg.

	Systolic (mm Hg)	Diastolic (mm Hg)
Normal blood pressure	less than 120	less than 80
Elevated blood pressure	120–129	less than 80
Grade 1 hypertension	130–139	80–89
Grade 2 hypertension	140 and over	90 and over

 

An estimated 1.28 billion adults aged 30–79 years worldwide have hypertension, most (two-thirds) living in low- and middle-income countries

An estimated 46% of adults with hypertension are unaware that they have the condition.

Less than half of adults (42%) with hypertension are diagnosed and treated.

Approximately 1 in 5 adults (21%) with hypertension have it under control.

Hypertension is a major cause of premature death worldwide.

One of the global targets for non-communicable diseases is to reduce the prevalence of hypertension by 33% between 2010 and 2030.

People with high blood pressure may not feel symptoms. The only way to know is to get your blood pressure checked.

Things that increase the risk of having high blood pressure include: Older age, genetics, being overweight or obese, not being physically active, high-salt diet and  drinking too much alcohol.

Risk factors

Modifiable risk factors include unhealthy diets (excessive salt consumption, a diet high in saturated fat and trans fats, low intake of fruits and vegetables), physical inactivity, consumption of tobacco and alcohol, and being overweight or obese. In addition, there are environmental risk factors for hypertension and associated diseases, where air pollution is the most significant. 

Non-modifiable risk factors include a family history of hypertension, age over 65 years and co-existing diseases such as diabetes or kidney disease.

Symptoms

Most people with hypertension don’t feel any symptoms. Very high blood pressures can cause headaches, blurred vision, chest pain and other symptoms. 

Checking your blood pressure is the best way to know if you have high blood pressure. If hypertension isn’t treated, it can cause other health conditions like kidney disease, heart disease and stroke.

People with very high blood pressure (usually 180/120 or higher) can experience symptoms including: Severe headaches, chest pain, dizziness, difficulty breathing, nausea, vomiting, blurred vision or other vision changes and anxiety. Others are: Confusion, buzzing in the ears nosebleeds and abnormal heart rhythm.

If you are experiencing any of these symptoms and a high blood pressure, seek care immediately.

The only way to detect hypertension is to have a health professional measure blood pressure. Having blood pressure measured is quick and painless. Although individuals can measure their own blood pressure using automated devices, an evaluation by a health professional is important for assessment of risk and associated conditions.

Treatment

Lifestyle changes can help lower high blood pressure. These include: Eating a healthy, low-salt diet, losing weight, being physically active and quitting tobacco.

If you have high blood pressure, your doctor may recommend one or more medicines. Your recommended blood pressure goal may depend on what other health conditions you have. 

Blood pressure goal is less than 130/80 if you have: Cardiovascular disease (heart disease or stroke), diabetes (high blood sugar), chronic kidney disease and high risk for cardiovascular disease.

For most people, the goal is to have a blood pressure less than 140/90. 

There are several common blood pressure medicines: ACE inhibitors including enalapril and lisinopril relax blood vessels and prevent kidney damage.

Angiotensin-2 receptor blockers (ARBs) including losartan and telmisartan relax blood vessels and prevent kidney damage.

Calcium channel blockers including amlodipine and felodipine relax blood vessels.

Diuretics including hydrochlorothiazide and chlorthalidone eliminate extra water from the body, lowering blood pressure.

Prevention

Lifestyle changes can help lower high blood pressure and can help anyone with hypertension. Many who make these changes will still need to take medicine. 

These lifestyle changes can help prevent and lower high blood pressure. 

Do: Eat more vegetables and fruits, sit less, be more physically active, which can include walking, running, swimming, dancing or activities that build strength, like lifting weights.
Get at least 150 minutes per week of moderate-intensity aerobic activity or 75 minutes per week of vigorous aerobic activity.

Do strength building exercises 2 or more days each week. Lose weight if you’re overweight or obese. Take medicines as prescribed by your health care professional. Keep appointments with your health care professional.

Don’t: Eat too much salty food (try to stay under 2 grams per day), eat foods high in saturated or trans fats, smoke or use tobacco, drink too much alcohol (1 drink daily max for women, 2 for men), miss or share medication.

Reducing hypertension prevents heart attack, stroke and kidney damage, as well as other health problems.

Reduce the risks of hypertension by: Reducing and managing stress, regularly checking blood pressure, treating high blood pressure, managing other medical conditions, reducing exposure to polluted air.

Complications of uncontrolled hypertension

Among other complications, hypertension can cause serious damage to the heart. Excessive pressure can harden arteries, decreasing the flow of blood and oxygen to the heart. This elevated pressure and reduced blood flow can cause: Chest pain, also called angina; heart attack, which occurs when the blood supply to the heart is blocked and heart muscle cells die from lack of oxygen. The longer the blood flow is blocked, the greater the damage to the heart; heart failure, which occurs when the heart cannot pump enough blood and oxygen to other vital body organs; and irregular heart beat which can lead to a sudden death.

Hypertension can also burst or block arteries that supply blood and oxygen to the brain, causing a stroke.

In addition, hypertension can cause kidney damage, leading to kidney failure.