High blood pressure

  • Definition
    • Blood pressure is a measurement of the force exerted against the walls of your arteries as your heart pumps blood to your body. Hypertension is the 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 mm Hg).

      One or both of these numbers can be too high. (Note: These numbers apply to people who are not taking medicines for blood pressure and are not ill.)

      • Normal blood pressure is when your blood pressure is lower than 120/80 mm Hg most of the time.
      • High blood pressure (hypertension) is when your blood pressure is 140/90 mm Hg 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.

  • Alternative Names
    • Hypertension; HBP

  • Causes
    • 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
      • Are obese
      • Are often stressed or anxious
      • Drink too much alcohol (more than 1 drink per day for women and more than 2 drinks per day for men)
      • Eat too much salt
      • Have a family history of high blood pressure
      • Have diabetes
      • 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:

      Is High Blood Pressure Affecting Your Health?

      1. What is blood pressure?

        1. A. The force against the walls of your arteries as your heart pumps blood through your body
        2. B. The total weight of the blood in your body
        3. C. A sign that you are angry

        The correct answer is a measurement of the force against the walls of your arteries as your heart pumps blood through your body. Your blood pressure is reported as two numbers: systolic over diastolic blood pressure. If either number is too high, there will be extra stress on your heart and blood vessels.

      2. A common sign of high blood pressure is:

        1. A. Fatigue
        2. B. Dizziness
        3. C. Trouble breathing
        4. D. Chest pain
        5. E. None of the above

        The correct answer is none of the above. In most people, high blood pressure does not cause any symptoms. This means you may only find out about the problem when your doctor or nurse checks your blood pressure. Ask your doctor how to prevent high blood pressure.

      3. When blood pressure stays high, it can lead to:

        1. A. Heart attack
        2. B. Stroke
        3. C. Eye problems
        4. D. Kidney disease
        5. E. All of the above

        The correct answer is all of the above. Diagnosing high blood pressure early can help prevent these health problems. Get your blood pressure checked every two years if it was normal at your last reading and at least once a year if it was 120/80 or above. If you have high blood pressure, your doctor may ask you to check it at home.

      4. High blood pressure can cause the heart muscle to thicken.

        1. A. True
        2. B. False

        The correct answer is true. As the heart muscle works harder, it can become so thick that it doesn't get enough oxygen. This can cause chest pain and may lead to heart failure. Heart failure occurs when the heart can't pump enough blood to the rest of your body. Talk with your doctor about how to lower high blood pressure.

      5. High blood pressure can make the blood vessels wider.

        1. A. True
        2. B. False

        The correct answer is false. High blood pressure causes blood vessel walls to get thicker. Over time, fat and cholesterol can also build up on vessel walls. These two problems together cause blood vessels to become narrow, so blood can't flow as freely. Reduced blood flow can increase the risk of heart attack and stroke.

      6. Which is a sign of decreased blood flow?

        1. A. Pain in the legs and feet when walking
        2. B. Pale skin on your legs and feet
        3. C. Erection problems in men
        4. D. Numbness in legs and feet
        5. E. All of the above

        The correct answer is all of the above. High blood pressure can raise your risk of peripheral artery disease (PAD). This is the narrowing of the vessels that carry blood to the legs and feet. PAD occurs most often in men over age 50. See your doctor if you have high blood pressure and notice any discomfort in your legs or feet.

      7. Which of the following are risk factors for stroke?

        1. A. Family history of stroke
        2. B. High cholesterol
        3. C. Abnormal heartbeat (atrial fibrillation)
        4. D. High blood pressure
        5. E. Diabetes
        6. F. All of the above

        The correct answer is all of the above. High blood pressure is the number one risk factor. A stroke occurs when a blood vessel that supplies the brain bursts or gets blocked by a blood clot. The symptoms depend on which part of the brain is affected. Ask your doctor to explain warning signs of stroke.

      8. Which is NOT a common warning sign of stroke?

        1. A. Confusion, trouble speaking or understanding others who are speaking
        2. B. Dizziness, loss of balance or coordination, trouble walking
        3. C. Weakness or numbness in the face, arm, or leg (often just on one side)
        4. D. Sudden problems with eyesight
        5. E. Sudden and severe headache
        6. F. Chest pain

        The correct answer is chest pain. If you notice any signs of stroke listed above, call 9-1-1 immediately. Prompt treatment can save your life. If the stroke is caused by a blood clot, a clot-busting drug may be given to dissolve the clot. For this drug to work, you must be treated 3 to 4 1/2 hours after symptoms first started.

      9. If high blood pressure affects your eyes, you might develop:

        1. A. Headaches
        2. B. Double vision
        3. C. Sudden loss of vision
        4. D. All of the above

        The correct answer is all of the above. High blood pressure can damage blood vessels in the retina, the part of the eye that changes images into signals the brain can read. You may not have symptoms at first. Tell your doctor right away if you notice any changes in vision.

      10. Symptoms of kidney disease appear immediately.

        1. A. True
        2. B. False

        The correct answer is false. Your kidneys remove wastes and excess water from your body. High blood pressure damages the kidneys, making it harder for them to function. Kidney disease often has no symptoms until a lot of damage has occurred. Controlling high blood pressure can protect your kidneys.

  • Symptoms
    • Most of the time, there are no symptoms. For most people, 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 may include:

      • Severe headache
      • Nausea and vomiting
      • Confusion
      • Vision changes
      • Nosebleeds
  • Exams and Tests
    • Diagnosing high blood pressure early can help prevent heart disease, stroke, eye problems, and chronic kidney disease.

      Your provider 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.

      Adults aged 18 to 39 years should have their blood pressure checked:

      • Every 3 to 5 years, if their blood pressure was less than 120/80 mm Hg at their most recent reading.
      • Every year if you have high blood pressure, diabetes, heart disease, kidney problems, or certain other conditions, have your blood pressure checked more often.

      Adults aged 40 and over should have their blood pressure checked 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 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 provider to make sure you are taking your blood pressure correctly.
      • You should be relaxed and seated for several minutes prior to taking a reading.
      • Bring your home monitor to your appointments so your provider can make sure it is working correctly.

      Your 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:

  • Treatment
    • The goal of treatment is to reduce your blood pressure so that you have a lower risk of complications. You and your provider should set a blood pressure goal for you.

      If you have pre-hypertension, your 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.
      Lifestyle changes

      Your provider can help you find programs for losing weight, stopping smoking, and exercising.

      You can also get a referral 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.


      Most of the time, your provider will try lifestyle changes first and check your BP 2 or more times. Medicines will likely be started if your BP readings remain at or above these levels:

      • Top number (systolic pressure) of 140 or more in people younger than 60 years
      • Top number of 150 or more in people 60 years and older
      • Bottom number (diastolic pressure) of 90 or more

      If you have diabetes, heart problems, or a history of a stroke, medicines may be started at lower blood pressure reading. The most commonly used blood pressure targets for people with these medical problems are below 130 to 140/80 mm Hg.

      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 2 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.
  • Outlook (Prognosis)
    • 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 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 provider right away if home monitoring shows that your blood pressure is still high.

  • Prevention
    • Most people can prevent high blood pressure from occurring by following lifestyle changes designed to bring blood pressure down.

  • References
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