Hypertension FAQs

Leslie Thomas, M.D., a nephrologist at Mayo Clinic, answers the important questions you may have about hypertension (high blood pressure).

Hi. I'm Dr. Leslie Thomas, a nephrologist at Mayo Clinic. And I'm here to answer some of the important questions you might have about hypertension.

What is the best way to measure my blood pressure at home?

Measuring your blood pressure at home is a straightforward process. Many people have a slightly higher blood pressure in one arm versus the other. So it's important to measure the blood pressures in the arm with the higher readings. It's best to avoid caffeine, exercise and, if you smoke, smoking for at least 30 minutes. To prepare for the measurement, you should be relaxed with your feet on the floor and legs uncrossed, and your back supported for at least five minutes. Your arms should be supported on a flat surface. After resting for five minutes, at least two readings are taken one minute apart in the morning prior to medications and in the evening before the evening meal. Your blood pressure monitor should be checked for proper calibration every year.

What could be causing my blood pressure to be quite erratic?

This pattern of abrupt changes in blood pressure from normal to quite high is sometimes referred to as labile blood pressure. For those who develop labile blood pressure, heart problems, hormonal problems, neurological problems, or even psychological conditions might be present. Finding and treating the underlying cause of labile blood pressure can significantly improve the condition.

Should I restrict salt to reduce my blood pressure?

It's important to note that some people with high blood pressure already consume a diet significantly restricted in sodium. And those people further restriction of dietary sodium would not necessarily be helpful or even recommended. In many people, dietary sodium intake is though relatively high. Therefore, an effective target to consider for those people is less than 1500 milligrams per day. Many though, will benefit from a target of less than a 1000 milligrams per day. Following dietary sodium restriction, it may take some time, even weeks, for the blood pressure to improve and stabilize at a lower range. So it is critically important to both be consistent with decreased sodium intake and patient when assessing for improvement.

How can I lower my blood pressure without medication?

This is a very common question. A lot of people want to avoid medication if they can, when trying to reduce their blood pressure. A few ways have been shown scientifically to reduce blood pressure. The first, and perhaps most important, is to stay physically active. Losing weight also can be important in a lot of different people. Limiting alcohol, reducing sodium intake, and increasing dietary potassium intake can all help.

What is the best medication to take for hypertension?

There's not one best medication for the treatment of hypertension for everyone. Because an individual's historical and present medical conditions must be considered. Additionally, every person has a unique physiology. Assessing how certain physiological forces may be present to contribute to the hypertension in an individual allows for a rational approach to medication choice. Antihypertensive medications are grouped by class. Each class of medication differs from the other classes by the way it lowers blood pressure. For instance, diuretics, no matter the type, act to reduce the body's total content of salt and water. This leads to reduction in plasma volume within the blood vessels and consequently a lower blood pressure. Calcium channel blockers reduce the relative constriction of blood vessels. This reduced vasoconstriction also promotes a lower blood pressure. Other classes of antihypertensive medication act in their own ways. Considering your health conditions, physiology, and how each medication works, your doctor can advise the safest and most effective medication for you.

Are certain blood pressure medications harmful to my kidneys?

Following the correction of blood pressure or the institution of certain blood pressure medications, it's pretty common to see changes in the markers for kidney function on blood tests. However, small changes in these markers, which reflects small changes in kidney filtration performance shouldn't necessarily be interpreted as absolute evidence of kidney harm. Your doctor can interpret changes in laboratory tests following any change in medication.

How can I be the best partner to my medical team?

Keep an open dialogue with your medical team about your goals and personal preferences. Communication, trust and collaboration are key to long-term success managing your blood pressure. Never hesitate to ask your medical team any questions or concerns you have. Being informed makes all the difference. Thanks for your time and we wish you well.

To diagnose high blood pressure, your health care provider examines you and asks questions about your medical history and any symptoms. Your provider listens to your heart using a device called a stethoscope.

Your blood pressure is checked using a cuff, usually placed around your arm. It's important that the cuff fits. If it's too big or too small, blood pressure readings can vary. The cuff is inflated using a small hand pump or a machine.

Blood pressure measurement

Blood pressure measurement

A blood pressure reading measures the pressure in the arteries when the heart beats (top number, called systolic pressure) and between heartbeats (bottom number, called diastolic pressure). To measure blood pressure, an inflatable cuff is usually placed around the arm. A machine or small hand pump is used to inflate the cuff. In this image, a machine records the blood pressure reading. This is called an automated blood pressure measurement.

The first time your blood pressure is checked, it should be measured in both arms to see if there's a difference. After that, the arm with the higher reading should be used.

Blood pressure is measured in millimeters of mercury (mm Hg). A blood pressure reading has two numbers.

  • Top number, called systolic pressure. The first, or upper, number measures the pressure in the arteries when the heart beats.
  • Bottom number, called diastolic pressure. The second, or lower, number measures the pressure in the arteries between heartbeats.

High blood pressure (hypertension) is diagnosed if the blood pressure reading is equal to or greater than 130/80 millimeters of mercury (mm Hg). A diagnosis of high blood pressure is usually based on the average of two or more readings taken on separate occasions.

Blood pressure is grouped according to how high it is. This is called staging. Staging helps guide treatment.

  • Stage 1 hypertension. The top number is between 130 and 139 mm Hg or the bottom number is between 80 and 89 mm Hg.
  • Stage 2 hypertension. The top number is 140 mm Hg or higher or the bottom number is 90 mm Hg or higher.

Sometimes the bottom blood pressure reading is normal (less than 80 mm Hg) but the top number is high. This is called isolated systolic hypertension. It's a common type of high blood pressure in people older than 65.


If you are diagnosed with high blood pressure, your provider may recommend tests to check for a cause.

  • Ambulatory monitoring. A longer blood pressure monitoring test may be done to check blood pressure at regular times over six or 24 hours. This is called ambulatory blood pressure monitoring. However, the devices used for the test aren't available in all medical centers. Check with your insurer to see if ambulatory blood pressure monitoring is a covered service.
  • Lab tests. Blood and urine tests are done to check for conditions that can cause or worsen high blood pressure. For example, tests are done to check your cholesterol and blood sugar levels. You may also have lab tests to check your kidney, liver and thyroid function.
  • Electrocardiogram (ECG or EKG). This quick and painless test measures the heart's electrical activity. It can tell how fast or how slow the heart is beating. During an electrocardiogram (ECG), sensors called electrodes are attached to the chest and sometimes to the arms or legs. Wires connect the sensors to a machine, which prints or displays results.
  • Echocardiogram. This noninvasive exam uses sound waves to create detailed images of the beating heart. It shows how blood moves through the heart and heart valves.

Taking your blood pressure at home

Your health care provider may ask you to regularly check your blood pressure at home. Home monitoring is a good way to keep track of your blood pressure. It helps your care providers know if your medicine is working or if your condition is getting worse.

Home blood pressure monitors are available at local stores and pharmacies.

For the most reliable blood pressure measurement, the American Heart Association recommends using a monitor with a cuff that goes around your upper arm, when available.

Devices that measure your blood pressure at your wrist or finger aren't recommended by the American Heart Association because they can provide less reliable results.


Changing your lifestyle can help control and manage high blood pressure. Your health care provider may recommend that you make lifestyle changes including:

  • Eating a heart-healthy diet with less salt
  • Getting regular physical activity
  • Maintaining a healthy weight or losing weight
  • Limiting alcohol
  • Not smoking
  • Getting 7 to 9 hours of sleep daily

Sometimes lifestyle changes aren't enough to treat high blood pressure. If they don't help, your provider may recommend medicine to lower your blood pressure.


The type of medicine used to treat hypertension depends on your overall health and how high your blood pressure is. Two or more blood pressure drugs often work better than one. It can take some time to find the medicine or combination of medicines that works best for you.

When taking blood pressure medicine, it's important to know your goal blood pressure level. You should aim for a blood pressure treatment goal of less than 130/80 mm Hg if:

  • You're a healthy adult age 65 or older
  • You're a healthy adult younger than age 65 with a 10% or higher risk of developing cardiovascular disease in the next 10 years
  • You have chronic kidney disease, diabetes or coronary artery disease

The ideal blood pressure goal can vary with age and health conditions, particularly if you're older than age 65.

Medicines used to treat high blood pressure include:

  • Water pills (diuretics). These drugs help remove sodium and water from the body. They are often the first medicines used to treat high blood pressure.

    There are different classes of diuretics, including thiazide, loop and potassium sparing. Which one your provider recommends depends on your blood pressure measurements and other health conditions, such as kidney disease or heart failure. Diuretics commonly used to treat blood pressure include chlorthalidone, hydrochlorothiazide (Microzide) and others.

    A common side effect of diuretics is increased urination. Urinating a lot can reduce potassium levels. A good balance of potassium is necessary to help the heart beat correctly. If you have low potassium (hypokalemia), your provider may recommend a potassium-sparing diuretic that contains triamterene.

  • Angiotensin-converting enzyme (ACE) inhibitors. These drugs help relax blood vessels. They block the formation of a natural chemical that narrows blood vessels. Examples include lisinopril (Prinivil, Zestril), benazepril (Lotensin), captopril and others.
  • Angiotensin II receptor blockers (ARBs). These drugs also relax blood vessels. They block the action, not the formation, of a natural chemical that narrows blood vessels. angiotensin II receptor blockers (ARBs) include candesartan (Atacand), losartan (Cozaar) and others.
  • Calcium channel blockers. These drugs help relax the muscles of the blood vessels. Some slow your heart rate. They include amlodipine (Norvasc), diltiazem (Cardizem, Tiazac, others) and others. Calcium channel blockers may work better for older people and Black people than do angiotensin-converting enzyme (ACE) inhibitors alone.

    Don't eat or drink grapefruit products when taking calcium channel blockers. Grapefruit increases blood levels of certain calcium channel blockers, which can be dangerous. Talk to your provider or pharmacist if you're concerned about interactions.

Other medicines sometimes used to treat high blood pressure

If you're having trouble reaching your blood pressure goal with combinations of the above medicines, your provider may prescribe:

  • Alpha blockers. These medicines reduce nerve signals to blood vessels. They help lower the effects of natural chemicals that narrow blood vessels. Alpha blockers include doxazosin (Cardura), prazosin (Minipress) and others.
  • Alpha-beta blockers. Alpha-beta blockers block nerve signals to blood vessels and slow the heartbeat. They reduce the amount of blood that must be pumped through the vessels. Alpha-beta blockers include carvedilol (Coreg) and labetalol (Trandate).
  • Beta blockers. These medicines reduce the workload on the heart and widen the blood vessels. This helps the heart beat slower and with less force. Beta blockers include atenolol (Tenormin), metoprolol (Lopressor, Toprol-XL, Kapspargo sprinkle) and others.

    Beta blockers aren't usually recommended as the only medicine prescribed. They may work best when combined with other blood pressure drugs.

  • Aldosterone antagonists. These drugs may be used to treat resistant hypertension. They block the effect of a natural chemical that can lead to salt and fluid buildup in the body. Examples are spironolactone (Aldactone) and eplerenone (Inspra).
  • Renin inhibitors. Aliskiren (Tekturna) slows the production of renin, an enzyme produced by the kidneys that starts a chain of chemical steps that increases blood pressure.

    Due to a risk of serious complications, including stroke, you shouldn't take aliskiren with ACE inhibitors or ARBs.

  • Vasodilators. These medicines stop the muscles in the artery walls from tightening. This prevents the arteries from narrowing. Examples include hydralazine and minoxidil.
  • Central-acting agents. These medicines prevent the brain from telling the nervous system to increase the heart rate and narrow the blood vessels. Examples include clonidine (Catapres, Kapvay), guanfacine (Intuniv) and methyldopa.

Always take blood pressure medicines as prescribed. Never skip a dose or abruptly stop taking blood pressure medicines. Suddenly stopping certain ones, such as beta blockers, can cause a sharp increase in blood pressure called rebound hypertension.

If you skip doses because of cost, side effects or forgetfulness, talk to your care provider about solutions. Don't change your treatment without your provider's guidance.

Treating resistant hypertension

You may have resistant hypertension if:

  • You take at least three different blood pressure drugs, including a diuretic. But your blood pressure remains stubbornly high.
  • You're taking four different medicines to control high blood pressure. Your care provider should check for a possible second cause of the high blood pressure.

Having resistant hypertension doesn't mean your blood pressure will never get lower. If you and your provider can determine the cause, a more effective treatment plan can be created.

Treating resistant hypertension may involve many steps, including:

  • Changing blood pressure medicines to find the best combination and dosage.
  • Reviewing all your medicines, including those bought without a prescription.
  • Checking blood pressure at home to see if medical appointments cause high blood pressure. This is called white coat hypertension.
  • Eating healthy, managing weight and making other recommended lifestyle changes.

High blood pressure during pregnancy

If you have high blood pressure and are pregnant, discuss with your care providers how to control blood pressure during your pregnancy.

Potential future treatments

Researchers have been studying the use of heat to destroy specific nerves in the kidney that may play a role in resistant hypertension. The method is called renal denervation. Early studies showed some benefit. But more-robust studies found that it doesn't significantly lower blood pressure in people with resistant hypertension. More research is underway to determine what role, if any, this therapy may have in treating hypertension.

Clinical trials

Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this condition.

Self care

A commitment to a healthy lifestyle can help prevent and manage high blood pressure. Try these heart-healthy strategies:

  • Eat healthy foods. Eat a healthy diet. Try the Dietary Approaches to Stop Hypertension (DASH) diet. Choose fruits, vegetables, whole grains, poultry, fish and low-fat dairy foods. Get plenty of potassium from natural sources, which can help lower blood pressure. Eat less saturated fat and trans fat.
  • Use less salt. Processed meats, canned foods, commercial soups, frozen dinners and certain breads can be hidden sources of salt. Check food labels for the sodium content. Limit foods and beverages that are high in sodium. A sodium intake of 1,500 mg a day or less is considered ideal for most adults. But ask your provider what's best for you.
  • Limit alcohol. Even if you're healthy, alcohol can raise your blood pressure. If you choose to drink alcohol, do so in moderation. For healthy adults, that means up to one drink a day for women, and up to two drinks a day for men. One drink equals 12 ounces of beer, 5 ounces of wine or 1.5 ounces of 80-proof liquor.
  • Don't smoke. Tobacco injures blood vessel walls and speeds up the process of hardening of the arteries. If you smoke, ask your care provider for strategies to help you quit.
  • Maintain a healthy weight. If you're overweight or have obesity, losing weight can help control blood pressure and lower the risk of complications. Ask your health care provider what weight is best for you. In general, blood pressure drops by about 1 mm Hg with every 2.2 pounds (1 kilogram) of weight lost. In people with high blood pressure, the drop in blood pressure may be even more significant per kilogram of weight lost.
  • Get more exercise. Regular exercise keeps the body healthy. It can lower blood pressure, ease stress, manage weight and reduce the risk of chronic health conditions. Aim to get at least 150 minutes a week of moderate aerobic activity or 75 minutes a week of vigorous aerobic activity, or a combination of the two.

    If you have high blood pressure, consistent moderate- to high-intensity workouts can lower your top blood pressure reading by about 11 mm Hg and the bottom number by about 5 mm Hg.

  • Practice good sleep habits. Poor sleep may increase the risk of heart disease and other chronic conditions. Adults should aim to get 7 to 9 hours of sleep daily. Kids often need more. Go to bed and wake at the same time every day, including on weekends. If you have trouble sleeping, talk to your provider about strategies that might help.
  • Manage stress. Find ways to help reduce emotional stress. Getting more exercise, practicing mindfulness and connecting with others in support groups are some ways to reduce stress.
  • Try slow, deep breathing. Practice taking deep, slow breaths to help relax. Some research shows that slow, paced breathing (5 to 7 deep breaths per minute) combined with mindfulness techniques can reduce blood pressure. There are devices available to promote slow, deep breathing. According to the American Heart Association, device-guided breathing may be a reasonable nondrug option for lowering blood pressure. It may be a good option if you have anxiety with high blood pressure or can't tolerate standard treatments.

Alternative medicine

Diet and exercise are the best ways to lower blood pressure. But some supplements are promoted as heart healthy. These supplements include:

  • Fiber, such as blond psyllium and wheat bran
  • Minerals, such as magnesium, calcium and potassium
  • Folic acid
  • Supplements or products that increase nitric oxide or widen blood vessels — called vasodilators — such as cocoa, coenzyme Q10, L-arginine and garlic
  • Omega-3 fatty acids, found in fatty fish, high-dose fish oil supplements and flaxseed

Researchers are also studying whether vitamin D can reduce blood pressure, but evidence is conflicting. More research is needed.

Talk to your care provider before adding any supplements to your blood pressure treatment. Some can interact with medicines, causing harmful side effects that could be life-threatening.

Deep breathing or mindfulness are alternative medicine techniques that can help you relax. These practices may temporarily reduce blood pressure.

Coping and support

High blood pressure isn't something that you can treat and then ignore. It's a condition that requires regular health checkups. Some things you can do to help manage the condition are:

  • Take medicines as directed. If side effects or costs pose problems, ask your provider about other options. Don't stop taking your medicines without first talking to a care provider.
  • Schedule regular health checkups. It takes a team effort to treat high blood pressure successfully. Work with your provider to bring your blood pressure to a safe level and keep it there. Know your goal blood pressure level.
  • Choose healthy habits. Eat healthy foods, lose excess weight and get regular physical activity. Limit alcohol. If you smoke, quit.
  • Manage stress. Say no to extra tasks, release negative thoughts, and remain patient and optimistic.
  • Ask for help. Sticking to lifestyle changes can be difficult, especially if you don't see or feel any symptoms of high blood pressure. It may help to ask your friends and family to help you meet your goals.
  • Join a support group. You may find that talking about any concerns with others in similar situations can help.

Preparing for your appointment

If you think you may have high blood pressure, make an appointment with your health care provider for a blood pressure test. You might want to wear a short-sleeved shirt to your appointment so it's easier to place the blood pressure cuff around your arm.

No special preparations are necessary for a blood pressure test. To get an accurate reading, avoid caffeine, exercise and tobacco for at least 30 minutes before the test.

Because some medicines can raise blood pressure, bring a list of all medicines, vitamins and other supplements you take and their doses to your medical appointment. Don't stop taking any medicines without your provider's advice.

Appointments can be brief. Because there's often a lot to discuss, it's a good idea to be prepared for your appointment. Here's some information to help you get ready.

What you can do

  • Write down any symptoms that you're having. High blood pressure rarely has symptoms, but it's a risk factor for heart disease. Let your care provider know if you have symptoms such as chest pains or shortness of breath. Doing so can help your provider decide how aggressively to treat your high blood pressure.
  • Write down important medical information, including a family history of high blood pressure, high cholesterol, heart disease, stroke, kidney disease or diabetes, and any major stresses or recent life changes.
  • Make a list of all medicines, vitamins or supplements that you're taking. Include dosages.
  • Take a family member or friend along, if possible. Sometimes it can be difficult to remember all the information provided to you during an appointment. Someone who accompanies you may remember something that you missed or forgot.
  • Be prepared to discuss your diet and exercise habits. If you don't already follow a diet or exercise routine, be ready to talk to your care provider about any challenges you might face in getting started.
  • Write down questions to ask your provider.

Preparing a list of questions can help you and your provider make the most of your time together. List your questions from most important to least important in case time runs out. For high blood pressure, some basic questions to ask your provider include:

  • What kinds of tests will I need?
  • What is my blood pressure goal?
  • Do I need any medicines?
  • Is there a generic alternative to the medicine you're prescribing for me?
  • What foods should I eat or avoid?
  • What's an appropriate level of physical activity?
  • How often do I need to schedule appointments to check my blood pressure?
  • Should I monitor my blood pressure at home?
  • I have other health conditions. How can I best manage them together?
  • Are there brochures or other printed material that I can have? What websites do you recommend?

Don't hesitate to ask any other questions that you might have.

What to expect from your doctor

Your health care provider is likely to ask you questions. Being ready to answer them may reserve time to go over any points you want to spend more time on. Your provider may ask:

  • Do you have a family history of high cholesterol, high blood pressure or heart disease?
  • What are your diet and exercise habits like?
  • Do you drink alcohol? How many drinks do you have in a week?
  • Do you smoke?
  • When did you last have your blood pressure checked? What was the result?

What you can do in the meantime

It's never too early to make healthy lifestyle changes, such as quitting smoking, eating healthy foods and getting more exercise. These are the main ways to protect yourself against high blood pressure and its complications, including heart attack and stroke.

Feb 29, 2024

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