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Vita health A-Z

H

HIGH BLOOD PRESSURE, HYPERTENSION

CONTENT:
Blood pressure is the force of blood against your artery walls as it circulates through your body. Blood pressure normally rises and falls throughout the day, but it can cause health problems if it stays high for a long time. Having high blood pressure raises your risk for heart disease and stroke, leading causes of death in the United States.1
High blood pressure is called the "silent killer" because many people don't realize they have it. High blood pressure often has no warning signs or symptoms.

Diastolic and Systolic


Measuring Your Blood Pressure

Measuring your blood pressure is quick and painless. A doctor or health professional wraps an inflatable cuff with a pressure gauge around your arm to squeeze the blood vessels. Then he or she listens to your pulse with a stethoscope while releasing air from the cuff and watching the gauge. The gauge measures blood pressure in millimeters of mercury, which is abbreviated as mmHg.
Blood pressure is measured using two numbers. The first (systolic) number represents the pressure in your blood vessels when your heart beats. The second (diastolic) number represents the pressure in your vessels when your heart rests between beats. If the measurement reads 120 systolic and 80 diastolic, you would say "120 over 80" or write "120/80 mmHg."


Effects of High Blood Pressure

High blood pressure can damage your health in many ways.
For instance, it can harden the arteries, decreasing the flow of blood and oxygen to the heart. This reduced flow can cause—

  • Chest pain, also called angina.
  • Heart failure, which occurs when the heart can't pump enough blood and oxygen to your other organs.
  • Heart attack, which occurs when the blood supply to your heart is blocked and heart muscle cells die from a lack of oxygen. The longer the blood flow is blocked, the greater the damage to the heart.

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

Blood Pressure Signs and Symptoms

High blood pressure is called the "silent killer" because many people don't realize they have it. High blood pressure often has no warning signs or symptoms.
The only way to detect whether or not you have high blood pressure is to have your blood pressure measured by a doctor or health professional—it is quick and painless.

Risk Factors

Some health conditions, as well as lifestyle and genetic factors, can put people at a higher risk for developing high blood pressure. However, everyone can take steps to lower their blood pressure.

Conditions
Because blood pressure tends to rise as people get older, everyone's risk for high blood pressure increases with age. In addition, some medical conditions can also raise your risk of high blood pressure.


Prehypertension

Prehypertension—blood pressure levels that are slightly higher than normal—increases the risk that you will go on to develop chronic high blood pressure.


Blood Pressure Levels

Normal

Systolic: less than 120 mmHg
Diastolic: less than 80 mmHg

At Risk (Prehypertension)

Systolic: 120–139 mmHg
Diastolic: 80–89 mmHg

High

Systolic: 140 mmHg or higher
Diastolic: 90 mmHg or higher



Diabetes

Diabetes affects the body's use of a hormone called insulin. This hormone tells the body to remove sugar from the blood. With diabetes, the body either doesn't make enough insulin, can't use its own insulin as well as it should, or both. This causes sugars to build up in the blood. About 60% of people who have diabetes also have high blood pressure.

Behavior
Healthy behaviors contribute to keeping your blood pressure low, which in turn decreases your risk of heart disease.


Diet

Sodium is the element in salt that can raise blood pressure. Most of the sodium we eat comes from processed and restaurant foods. Eating too much sodium can increase blood pressure. Not eating enough potassium (from fruits and vegetables) can also increase blood pressure.


Weight

Being overweight can cause high blood pressure.


Physical Inactivity

Not getting enough exercise can make you gain weight, which can lead to high blood pressure.


Alcohol Use

Drinking too much alcohol can raise your blood pressure.


Tobacco Use

Smoking raises your risk for high blood pressure.

Heredity
There are also several factors that you cannot change that affect your blood pressure, like heredity.


Age

Blood pressure tends to rise as people get older.


Race or Ethnicity

s have a higher prevalence of high blood pressure than whites.1


Diabetes

About 60% of people who have diabetes also have high blood pressure.2


Family History

High blood pressure can run in families. People can inherit genes that make them more likely to develop the condition. The risk for high blood pressure can increase even more when heredity is combined with unhealthy lifestyle choices, such as smoking cigarettes and eating a poor diet.

Most Americans Consume Too Much Sodium
Most of the sodium we consume is in the form of salt, and the vast majority of sodium we consume is in processed and restaurant foods. Too much sodium is bad for your health. It can increase your blood pressure and your risk for a heart attack and stroke. Heart disease and stroke are the first and fourth leading causes of death in both men and women in the U.S. each year.
The Dietary Guidelines for Americans (DGA), 2010 recommend reducing sodium intake to less than 2,300 milligrams (mg) per day. The DGA’s also recommend you should further reduce sodium to 1,500 milligrams (mg) per day if:

  • You are 51 years of age or older.
  • You are African American.
  • You have high blood pressure.
  • You have diabetes.
  • You have chronic kidney disease.

Nearly everyone benefits from reduced sodium consumption. Eating less sodium can help prevent, or control, high blood pressure.
Most of the sodium we eat comes from packaged, processed, store-bought, and restaurants foods. Only a small amount comes from salt added during cooking and from being added at the table, and most Americans have already exceeded their daily limit of sodium before cooking or adding salt at the table.

Most sodium comes from processed and restaurant foods. The pie chart shows Processed and Restaurant Foods portion at 77%; Naturally Occurring, 12%; While eating, 6%; and Home Cooking, 5%.


Source: Mattes, RD, Donnelly, D. Relative contributions of dietary sodium sources. Journal of the American College of Nutrition 1991;10(4):383–393.



What You Can Do

To reduce your risk of heart disease and stroke—

  • Follow the DASH eating plan (Dietary Approaches to Stop Hypertension) that is LOW in sodium, cholesterol, saturated and total fat, and HIGH in fruits and vegetables, fiber, potassium, and low-fat dairy products.
  • Know your recommended limits for daily sodium intake.
  • Read the nutrition label of the foods you purchase.
  • Ask for foods with no or low salt at restaurants.
  • Make other lifestyle changes, like getting more physical activity.

Prevention
High blood pressure increases your risk for heart disease. People at any age can take steps each day to keep blood pressure levels normal.

How to Prevent High Blood Pressure
Increases in blood pressure increases your risk for heart disease. People at any age can take steps each day to keep blood pressure levels normal.


Lifestyle
  • Eat a healthy diet. Eating healthfully can help keep your blood pressure down. Eat lots of fresh fruits and vegetables, which provide nutrients such as potassium and fiber. Also, eat foods that are low in saturated fat and cholesterol.

    Avoid sodium by limiting the amount of salt you add to your food. Be aware that many processed foods and restaurant meals are high in sodium.

    Studies1 have shown that people who eat a healthy diet can lower their blood pressure. For more information on healthy diet and nutrition, seeCDC's Nutrition and Physical Activity Program Web site.
  • Maintain a healthy weight. Being overweight can raise your blood pressure. Losing weight can help you lower your blood pressure.

    To find out whether your weight is healthy, doctors often calculate a number called the body mass index (BMI). Doctors sometimes also use waist and hip measurements to measure a person’s excess body fat.

    If you know your weight and height, you can compute your BMI at CDC’s Assessing Your Weight Web site.
  • Be physically active. Physical activity can help lower blood pressure. The Surgeon General recommends adults engage in moderate-intensity exercise for 2 hours and 30 minutes every week.

Key Definitions

  • Cholesterol is a fat-like substance in the body. High levels in the blood can lead to heart disease and stroke.
  • Saturated fats come largely from animal fat in the diet, but also from some vegetable oils such as palm oil.
  • Sodium is the element in salt that can raise blood pressure. Most of the sodium we eat comes from processed and restaurant foods.
  • Diabetes is a disease that affects the body’s use of insulin. Insulin tells the body to remove sugar from the blood. People with diabetes either don't make enough insulin, can't use their own insulin as well as they should, or both.

For more information, see the CDC's Nutrition and Physical Activity Program Web site.
For more information, see CDC's Physical Activity Web site.

  • Don't smoke. Smoking injures blood vessels and speeds up the hardening of the arteries. Further, smoking is a major risk for heart disease and stroke.

If you don’t smoke, don’t start. If you do smoke, quitting will lower your risk for heart disease and stroke. Your doctor can suggest programs to help you quit.
For more information about tobacco use and quitting, see CDC's Smoking and Tobacco Use Web site.

  • Limit alcohol use. Drinking too much alcohol is associated with high blood pressure.

If you drink alcohol, you should do so in moderation—no more than one drink per day for women or two drinks per day for men.
More information on alcohol can be found at the CDC's Alcohol and Public Health Web site.


What You Can Do
    • Check your blood pressure. Getting your blood pressure checked is important because high blood pressure often has no symptoms.

Your doctor can measure your blood pressure, or you can use a machine available at many pharmacies. You can also use a home monitoring device to measure your blood pressure.
Blood pressure is written as two numbers. The first (systolic) number represents the pressure in your blood vessels when your heart beats. The second (diastolic) number represents the pressure in your vessels when your heart rests between beats.


Blood Pressure Levels

Normal

Systolic: less than 120 mmHg
Diastolic: less than 80 mmHg

At risk (prehypertension)

Systolic: 120–139 mmHg
Diastolic: 80–89 mmHg

High

Systolic: 140 mmHg or higher
Diastolic: 90 mmHg or higher



Prevent or Treat Your Medical Conditions
    • Prevent and manage diabetes. You can reduce your risk of diabetes by eating a healthy diet, maintaining a healthy weight, and being physically active.

About 60% of people who have diabetes also have high blood pressure.2 If you have diabetes, you can lower your risk for high blood pressure by following the healthy guidelines listed here.
For more information about diabetes, see CDC's Diabetes Public Health Resource Web site.

    • Treat high blood pressure. If you already have high blood pressure, your doctor may prescribe medications in addition to lifestyle changes.

All drugs may have side effects, so talk with your doctor on a regular basis. As your blood pressure improves, your doctor will want to monitor it often.
Lifestyle changes are just as important as taking medications.