High blood pressure
Blood pressure is a measurement of the force against the walls of your arteries as your heart pumps blood through your body. Hypertension is another term used to describe high blood pressure.
Blood pressure readings are given as two numbers. The top number is called the systolic blood pressure. The bottom number is called the diastolic blood pressure. For example, 120 over 80 (written as 120/80 mmHg).
One or both of these numbers can be too high.
- Normal blood pressure is when your blood pressure is lower than 120/80 mmHg most of the time.
- High blood pressure (hypertension) is when your blood pressure is 140/90 mmHg or above most of the time.
- If your blood pressure numbers are 120/80 or higher, but below 140/90, it is called pre-hypertension.
If you have heart or kidney problems, or you had a stroke, your doctor may want your blood pressure to be even lower than that of people who do not have these conditions.
Many factors can affect blood pressure, including:
- The amount of water and salt you have in your body
- The condition of your kidneys, nervous system, or blood vessels
- Your hormone levels
You are more likely to be told your blood pressure is too high as you get older. This is because your blood vessels become stiffer as you age. When that happens, your blood pressure goes up. High blood pressure increases your chance of having a stroke, heart attack, heart failure, kidney disease, or early death.
You have a higher risk of high blood pressure if:
- You are African American
- You are obese
- You are often stressed or anxious
- You drink too much alcohol (more than 1 drink per day for women and more than 2 drinks per day for men)
- You eat too much salt
- You have a family history of high blood pressure
- You have diabetes
- You smoke
Most of the time, no cause of high blood pressure is found. This is called essential hypertension.
High blood pressure that is caused by another medical condition or medicine you are taking is called secondary hypertension. Secondary hypertension may be due to:
- Chronic kidney disease
- Disorders of the adrenal gland (such as pheochromocytoma or Cushing syndrome)
- Pregnancy or preeclampsia
- Medications such as birth control pills, diet pills, some cold medicines, and migraine medicines
- Narrowed artery that supplies blood to the kidney (renal artery stenosis)
Most of the time, there are no symptoms. For most patients, high blood pressure is found when they visit their health care provider or have it checked elsewhere.
Because there are no symptoms, people can develop heart disease and kidney problems without knowing they have high blood pressure.
Malignant hypertension is a dangerous form of very high blood pressure. Symptoms include:
- Severe headache
- Nausea or vomiting
- Vision changes
Exams and Tests
Your doctor will measure your blood pressure many times before diagnosing you with high blood pressure. It is normal for your blood pressure to be different based on the time of day.
- All adults should have their blood pressure checked every 1 to 2 years if their blood pressure was less than 120/80 mmHg at their most recent reading.
- If you have high blood pressure, diabetes, heart disease, kidney problems, or certain other conditions, have your blood pressure checked more often -- at least once every year.
Blood pressure readings taken at home may be a better measure of your current blood pressure than those taken at your health care provider's office.
- Make sure you get a good quality, well-fitting home blood pressure monitor. It should have the proper sized cuff and a digital readout.
- Practice with your doctor or nurse to make sure you are taking your blood pressure correctly.
- Bring your home monitor to your appointments so your doctor can make sure it is working correctly.
Your health care provider will do a physical exam to look for signs of heart disease, damage to the eyes, and other changes in your body.
Tests may also be done to look for:
The goal of treatment is to reduce your blood pressure so that you have a lower risk of complications. You and your health care provider should set a blood pressure goal for you.
If you have pre-hypertension, your health care provider will recommend lifestyle changes to bring your blood pressure down to a normal range. Medicines are rarely used for pre-hypertension.
You can do many things to help control your blood pressure at home, including:
- Eat a heart-healthy diet, including potassium and fiber.
- Drink plenty of water.
- Exercise regularly for at least 30 minutes of aerobic exercise a day.
- If you smoke, quit.
- Limit how much alcohol you drink to 1 drink a day for women, and 2 a day for men.
- Limit the amount of sodium (salt) you eat -- aim for less than 1,500 mg per day.
- Reduce stress. Try to avoid things that cause you stress, and try meditation or yoga to de-stress.
- Stay at a healthy body weight.
Your health care provider can help you find programs for losing weight, stopping smoking, and exercising.
You can also get a referral from your health care provider to a dietitian, who can help you plan a diet that is healthy for you.
How low your blood pressure should be and at what level you need to start treatment is individualized, based on your age and any medical problems you have.
There are many different medicines to treat high blood pressure.
- Often, a single blood pressure drug may not be enough to control your blood pressure, and you may need to take two or more drugs.
- It is very important that you take the medicines prescribed to you.
- If you have side effects, your doctor can substitute a different medicine.
Most of the time, high blood pressure can be controlled with medicine and lifestyle changes.
When blood pressure is not well-controlled, you are at risk for:
When to Contact a Medical Professional
If you have high blood pressure, you will have regular checkups with your health care provider.
Even if you have not been diagnosed with high blood pressure, it is important to have your blood pressure checked during your regular check-up, especially if someone in your family has or had high blood pressure.
Call your health care provider right away if home monitoring shows that your blood pressure is still high.
Most people can prevent high blood pressure from occurring by following lifestyle changes designed to bring blood pressure down.
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Reviewed By: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.