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High Blood Pressure (Hypertension)Overview
What is high blood pressure?Blood pressure is a measure of how hard the blood pushes against the walls of your arteries as it moves through your body. It’s normal for blood pressure to go up and down throughout the day, but if it stays up, you have high blood pressure. Another name for high blood pressure is hypertension. When blood pressure is high, it starts to damage the blood vessels, heart, and kidneys. This can lead to heart attack, stroke, and other problems. High blood pressure is called a "silent killer,'' because it doesn't usually cause symptoms while it is causing this damage. Your blood pressure consists of two numbers: systolic and diastolic. Someone with a systolic pressure of 120 and a diastolic pressure of 80 has a blood pressure of 120/80, or "120 over 80."
Adults should have a blood pressure of less than 120/80. High blood pressure is 140/90 or higher. Many people fall into the category in between, called prehypertension. People with prehypertension need to make lifestyle changes to bring the blood pressure down and help prevent or delay high blood pressure. What causes high blood pressure?In most cases, doctors can't point to the exact cause. But several things are known to raise blood pressure, including being very overweight, drinking too much alcohol, having a family history of high blood pressure, eating too much salt, and getting older. Your blood pressure may also rise if you are not very active, you don't eat enough potassium and calcium, or you have a condition called insulin resistance. What are the symptoms?High blood pressure doesn't usually cause symptoms. Most people don't know they have it until they go to the doctor for some other reason. Without treatment, high blood pressure can damage the heart, brain, kidneys, or eyes. This damage causes problems like coronary artery disease, stroke, and kidney failure. Very high blood pressure can cause headaches, vision problems, nausea, and vomiting. These symptoms can also be caused by dangerously high blood pressure called malignant high blood pressure. It may also be called a hypertensive crisis or hypertensive emergency. Malignant high blood pressure is a medical emergency. How is high blood pressure diagnosed?Most people find out they have high blood pressure during a routine doctor visit. For your doctor to confirm that you have high blood pressure, your blood pressure must be at least 140/90 on three or more separate occasions. It is usually measured 1 to 2 weeks apart. You may have to check your blood pressure at home if there is reason to think the readings in the doctor’s office aren't accurate. You may have what is called white-coat hypertension, which is blood pressure that goes up just because you're at the doctor’s office. Even routine activities, such as attending a meeting, can raise your blood pressure. So can commuting to work or smoking a cigarette. How is it treated?Treatment depends on how high your blood pressure is, whether you have other health problems such as diabetes, and whether any organs have already been damaged. Your doctor will also consider how likely you are to develop other diseases, especially heart disease. You can help lower your blood pressure by making healthy changes in your lifestyle. If those lifestyle changes don't work, you may also need to take pills. Either way, you will need to control your high blood pressure throughout your life.
Most people take more than one pill for high blood pressure. Work with your doctor to find the right pill or combination of pills that will cause the fewest side effects. It can be hard to remember to take pills when you have no symptoms. But your blood pressure will go back up if you don't take your medicine. Make your pill schedule as simple as you can. Plan times to take them when you are doing other things, like eating a meal or getting ready for bed. What can you do to prevent high blood pressure?Lifestyle changes you can make to help prevent high blood pressure include:
Health ToolsHealth Tools help you make wise health decisions or take action to improve your health.
Frequently Asked QuestionsCauseExperts know that many different factors are linked to high blood pressure. But experts still don't fully understand the exact cause. Factors that are linked to high blood pressure include:
Primary, or essential, high blood pressure accounts for almost all cases of hypertension. Secondary high blood pressure, which is caused by another disease or medicine, is less common. Elevated blood pressure readings may not always mean that you have high blood pressure. For some people, just being in a medical setting causes their blood pressure to rise. This is called white-coat hypertension. SymptomsPeople with primary (essential) high blood pressure usually do not have any symptoms. Most people with high blood pressure feel fine. It's during a routine exam or a doctor visit for another problem that they find out they have high blood pressure. Very severe high blood pressure (160 over 100 or higher), may lead to hypertensive crisis. This is also called hypertensive emergency or malignant high blood pressure. Very severe high blood pressure is a medical emergency. Symptoms of very severe high blood pressure include:
Over time, untreated high blood pressure can damage organs, such as the heart, kidneys, or eyes. This may lead to:
What HappensBlood pressure commonly rises as you get older. But this normal increase occurs more quickly in people who already have high blood pressure. Untreated
high blood pressure can damage the delicate lining of
the blood vessels. After a blood vessel is damaged, fat and calcium can easily
build up along the artery wall, forming a
plaque. The blood vessel becomes narrowed and stiff
(atherosclerosis), and blood flow through the blood
vessel is reduced. See a picture of
how high blood pressure damages arteries Over time, decreased blood flow to certain organs in the body can cause damage, leading to:
People with borderline, or "high-normal," blood pressure (120–139/80–89), which is now considered "prehypertensive," have a higher risk for developing high blood pressure and heart disease than those with blood pressure less than 120/80 millimeters of mercury (mm Hg). Also, men who have high systolic blood pressure during middle age (50s to 60s) may show a greater decline in mental ability later in life (after age 75) than men who do not have high blood pressure earlier. Short-term memory and attention span are most affected. Elevated blood pressure readings may not always mean you have high blood pressure. For some people, just being in a medical setting causes their blood pressure to rise. This is called white-coat hypertension. Malignant hypertension, also called hypertensive crisis or hypertensive emergency, is severe high blood pressure. This blood pressure is so high that it can damage organs like the eyes and kidneys. It is a medical emergency. It may happen if someone suddenly stops taking his or her blood pressure medicine or misses a dose of medicine. In other cases, the cause may be unknown, or it may be caused by a medicine or another condition. Isolated systolic high blood pressure is when systolic blood pressure is elevated above 140 mm Hg, but diastolic blood pressure stays at less than 90 mm Hg. This type of high blood pressure is more common in older adults, especially older women. If you are older than 50, a systolic blood pressure over 140 is a more important risk factor for heart disease and stroke than your diastolic blood pressure.1
What Increases Your RiskRisk factors for high blood pressure include:
Other possible risk factors include:
People who have high blood pressure along with any of the following risk factors are at increased risk for developing complications, such as coronary artery disease, heart attack, abnormal heartbeat, stroke, kidney failure, and eye damage (retinopathy). These risk factors are:
When to Call a DoctorCall 911 or other emergency services immediately if you have any of the following symptoms:
Call a doctor immediately if you have high blood pressure and:
Call a doctor if:
Adults are encouraged to have their blood pressure checked regularly. Who to SeeYour blood pressure can be checked:
For diagnosis and management of high blood pressure, see:
Exams and TestsIn most cases, extensive tests are not needed to diagnose high blood pressure. If a blood pressure measurement shows your systolic and/or diastolic blood pressure is high, usually two more measurements at separate times will be done to confirm that you have high blood pressure. Routine testsA physical exam and a medical history are routinely used to evaluate high blood pressure. Before treatment is started, other blood tests and urine tests, such as urinalysis, may be done to find out whether there has been damage to organs and to check for complications. These lab tests may include measurements of potassium, sodium (a component of salt), glucose (blood sugar), cholesterol levels, and tests to measure kidney function. Electrocardiogram (EKG, ECG) also may be done to find out whether there is any damage to the heart. Your doctor may want to check your risk of coronary artery disease. In most people who have high blood pressure without any complications, routine lab test results will be normal. Sometimes, findings may suggest kidney disease, diabetes, or a hormone disorder. If there is reason to suspect that blood pressure measurements taken in the doctor's office do not represent your accurate blood pressure (for example, if you may have white-coat hypertension), you may need to get your blood pressure measured away from the doctor's office. In some cases, you may be asked to check your blood pressure at home and keep a record of the readings. If you are not able to measure your blood pressure accurately at home, you may need ambulatory blood pressure monitoring. If your blood pressure is higher than 135/80, your doctor will likely ask you to get a test for diabetes.2
Early detectionScreening tests and programs for high blood pressure vary widely in reliability. Results from automated blood pressure testing, such as you might do at a grocery store or pharmacy, may not be accurate. Any high blood pressure measurement discovered during a blood pressure screening program needs to be confirmed by a doctor or another health professional. Rechecking blood pressure The Seventh Joint National Committee (JNC 7) on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure recommends:1
Treatment OverviewTreatment for high blood pressure depends on the severity of the disease and whether you have other health problems, such as heart failure or diabetes. Your doctor may want you to try lifestyle changes first, including losing weight, increasing activity, and eating a balanced diet. If your blood pressure is above a certain level, your doctor may prescribe medicine along with the lifestyle changes. Some people may only need lifestyle changes to control their high blood pressure, while others need medicine as well. Either way, treating high blood pressure usually is a lifelong process. Treatment of primary high blood pressure, especially moderate or severe high blood pressure, decreases the risk of heart failure, coronary artery disease, heart attack, abnormal heartbeats, stroke, and kidney disease, and it reduces the risk of death from these conditions. Overall, goals of treatment are to:
Initial treatmentIf you fall into the prehypertension range (120–139/80–89), your doctor will likely recommend lifestyle changes, including:
The DASH eating plan is a low-fat and low-saturated-fat diet that emphasizes eating more fruits, vegetables, whole grains, and low-fat dairy foods. For more information, see: A chart on heart-healthy diets If you have high blood pressure (140–159/90–99 mm Hg) and you do not have any organ damage or other risk factors for heart disease (this is called uncomplicated high blood pressure), your doctor will likely recommend lifestyle changes and possibly medicines. Most people with high blood pressure will need two or more medicines, including a thiazide-type diuretic, to lower their blood pressure to below 140/90 mm Hg, which is the goal for people with uncomplicated hypertension. If you have other conditions, such as diabetes, heart failure, coronary artery disease, or chronic kidney disease, your doctor may recommend that your blood pressure should be less than 130/80. For more information, see: If your blood pressure is 160–179/100–109 mm Hg or higher, you may need to try various combinations of medicines to find what works best for you. You will also need to make aggressive lifestyle changes. For more information on medicines, see: Treatment of secondary high blood pressure varies depending on the cause. For example, treatment of high blood pressure caused by kidney disease will also include treating the kidney problem. If you have secondary high blood pressure, you may have to take blood pressure medicine long term, even if the condition that is causing your high blood pressure is treated. For more information, see the high blood pressure guidelines from the Seventh Report of the Joint National Committee (JNC 7) on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. People with high blood pressure who require special treatment considerations include: Ongoing treatmentMost cases of high blood pressure cannot be cured but can be controlled with lifestyle changes and medicine. Treatment is a lifelong process. You may need to try several different medicines or combinations of medicines, such as ACE inhibitors and diuretics, before finding the right combination that lowers your blood pressure to a safe level. If you have secondary high blood pressure, you may need treatment for the condition that is causing your high blood pressure. For more information on medicines, see: You may need to work with a registered dietitian to successfully follow the Dietary Approaches to Stop Hypertension (DASH) diet. For more information, see: It is important to follow the lifestyle changes your doctor recommends for the rest of your life to reduce your risk of heart disease and stroke. People with heart disease and high blood pressure have a high risk for future heart problems and need aggressive treatment. Treatment if the condition gets worseUntreated high blood pressure can lead to fatal heart attacks or strokes. The higher your blood pressure, the greater your risk for these complications. Lowering blood pressure reduces the risk of damaging blood vessels and developing atherosclerosis. As your high blood pressure rises, you may need to take higher doses of medicine or a combination of medicines. Many people take a combination of several medicines. For more information, see: What to Think AboutIn older adults, even small decreases in systolic blood pressure may be enough to prevent complications, if their diastolic blood pressure is normal. People who have high blood pressure are encouraged to make lifestyle changes and stay with these changes for the rest of their lives to reduce their blood pressure. Lifestyle changes such as eating a low-fat diet, quitting smoking, and exercising will help reduce the overall risk of heart disease and stroke and may reduce blood pressure significantly.
PreventionLifestyle changes can help you prevent high blood pressure. These changes are especially important for people who have risk factors for high blood pressure that cannot be changed, including family history, race, or age. Lifestyle changes include:
A chart on heart-healthy diets Living With High Blood PressureHome treatment is important to help control high blood pressure, especially if you have other risk factors for heart disease and stroke. Even if your doctor has prescribed medicine for you, there are still many steps you can take to lower your blood pressure and reduce your risk of heart attack and stroke. Changes in lifestyle or behavior can help control high blood pressure and in some cases may allow you to reduce the amount of medicine you need.
MedicationsDeciding whether to treat high blood pressure with medicine and choosing the best medicine are based mainly on:
Doctors may have different opinions about when to start medicines for high blood pressure.
Doctors usually prescribe a single, low-dose medicine first. If blood pressure is not controlled, your doctor may change the dosage or try a different medicine or combination of medicines. It is common to try several medicines before your blood pressure is successfully controlled. Many people need more than one medicine to get the best results. African Americans with blood pressure that is higher than 10 to 15 mm Hg above their goal may need to take a combination of medicines first.3 For more information, see: Medicine ChoicesMedicine choices include:
All of these medicines are effective for lowering the risk of heart attack and stroke. Treatment for high blood pressure must be highly individualized and based on your risk factors, such as diabetes, smoking, and heart disease. Although one study may recommend a particular medicine as the first line of treatment, it may not be best for you based on your medical condition. What's most important is that you work with your doctor to find the right medicine or combination of medicines that have the fewest side effects and work well for you and that you take your medicines regularly as prescribed. High blood pressure guidelines from the Seventh Report of the Joint National Committee (JNC 7) on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure recommend that, for most people, one of the medicines be a thiazide-type diuretic. If other conditions, such as heart failure or diabetes, are present, ACE inhibitors or ARBs often are used as the first line of therapy because the other medical conditions also may benefit from these medicines. But isolated systolic hypertension may respond best to diuretics alone. What to Think About
Check with your doctor before taking any nonsteroidal anti-inflammatory drugs (NSAIDs) with high blood pressure medicines. NSAIDs may raise blood pressure and lower the effectiveness of blood pressure medicines.
SurgeryThere is no surgical treatment for primary (essential) high blood pressure. Treatment for the various secondary causes of high blood pressure, such as narrowing of the kidney arteries or diseases of the adrenal gland, may include other medicines and/or surgery. Other TreatmentIn addition to making lifestyle changes, several other nondrug methods of reducing blood pressure can be tried.
Other Treatment ChoicesAlternative or complementary medicine therapies that help reduce stress and improve quality of life may have some effect on blood pressure. These therapies include: Although eating garlic and onions has been recommended to reduce blood pressure, evidence shows that only very small decreases in blood pressure may result. Fish oil (omega-3 fatty acids) also may have some effect on lowering blood pressure. Potassium, calcium, and magnesium. Not eating enough foods containing potassium, calcium, and magnesium may contribute to high blood pressure. Most people will get enough of these minerals by eating a balanced diet that contains plenty of fresh fruits, vegetables, dairy foods, whole grains, and legumes (cooked dried beans and peas). Or you may take supplements. What to Think AboutMany of the complementary medicine options listed above are inexpensive and probably not harmful. But it is best to work with your doctor when using these other methods along with traditional medical therapies. The safest way to ensure good nutrition is through a balanced, varied diet instead of through nutritional supplements. Acupuncture is currently being studied, and it shows some promise in lowering blood pressure.4 Other Places To Get HelpOrganizations
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