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High Blood Cholesterol: What You Need To Know
Table of Contents
Why Is Cholesterol Important?
Your blood cholesterol level has a lot to do with your chances of getting heart disease. High blood cholesterol is one of the major risk factors for heart disease. A risk factor is a condition that increases your chance of getting a disease. In fact, the higher your blood cholesterol level, the greater your risk for developing heart disease or having a heart attack. Heart disease is the number one killer of women and men in the United States. Each year, more than a million Americans have heart attacks, and about a half million people die from heart disease.
How Does Cholesterol Cause Heart Disease?
When there is too much cholesterol (a fat-like substance) in your blood, it builds up in the walls of your arteries. Over time, this buildup causes "hardening of the arteries" so that arteries become narrowed and blood flow to the heart is slowed down or blocked. The blood carries oxygen to the heart, and if enough blood and oxygen cannot reach your heart, you may suffer chest pain. If the blood supply to a portion of the heart is completely cut off by a blockage, the result is a heart attack.
High blood cholesterol itself does not cause symptoms, so many people are unaware that their cholesterol level is too high. It is important to find out what your cholesterol numbers are because lowering cholesterol levels that are too high lessens the risk for developing heart disease and reduces the chance of a heart attack or dying of heart disease, even if you already have it. Cholesterol lowering is important for everyone--younger, middle age, and older adults; women and men; and people with or without heart disease.
What Do Your Cholesterol Numbers Mean?
Everyone age 20 and older should have their cholesterol measured at least once every 5 years. It is best to have a blood test called a "lipoprotein profile" to find out your cholesterol numbers. This blood test is done after a 9- to 12-hour fast and gives information about your:
If it is not possible to get a lipoprotein profile done, knowing your total cholesterol and HDL cholesterol can give you a general idea about your cholesterol levels. If your total cholesterol is 200 mg/dL* or more or if your HDL is less than 40 mg/dL, you will need to have a lipoprotein profile done. See how your cholesterol numbers compare to the tables below.
* Cholesterol levels are measured in milligrams (mg) of cholesterol per deciliter (dL) of blood.
HDL (good) cholesterol protects against heart disease, so for HDL, higher numbers are better. A level less than 40 mg/dL is low and is considered a major risk factor because it increases your risk for developing heart disease. HDL levels of 60 mg/dL or more help to lower your risk for heart disease.
Triglycerides can also raise heart disease risk. Levels that are borderline high (150-199 mg/dL) or high (200 mg/dL or more) may need treatment in some people.
What Affects Cholesterol Levels?
A variety of things can affect cholesterol levels. These are things you can do something about:
Things you cannot do anything about also can affect cholesterol levels. These include:
What Is Your Risk of Developing Heart Disease or Having a Heart Attack?
In general, the higher your LDL level and the more risk factors you have (other than LDL), the greater your chances of developing heart disease or having a heart attack. Some people are at high risk for a heart attack because they already have heart disease. Other people are at high risk for developing heart disease because they have diabetes (which is a strong risk factor) or a combination of risk factors for heart disease. Follow these steps to find out your risk for developing heart disease.
Step 1: Check the table below to see how many of the listed risk factors you have; these are the risk factors that affect your LDL goal.
Major Risk Factors That Affect Your LDL Goal
* If your HDL cholesterol is 60 mg/dL or higher, subtract 1 from your total count.
Even though obesity and physical inactivity are not counted in this list, they are conditions that need to be corrected.
Step 2: How many major risk factors do you have? If you have 2 or more risk factors in the table above, use the attached risk scoring tables (which include your cholesterol levels) to find your risk score. Risk score refers to the chance of having a heart attack in the next 10 years, given as a percentage. My risk score is ________%.
Step 3: Use your medical history, number of risk factors, and risk score to find your risk of developing heart disease or having a heart attack in the table below.
* Means that more than 20 of 100 people in this category will have a heart attack within 10 years.
My risk category is ______________________.
Treating High Cholesterol
The main goal of cholesterol-lowering treatment is to lower your LDL level enough to reduce your risk of developing heart disease or having a heart attack. The higher your risk, the lower your LDL goal will be. To find your LDL goal, see the boxes below for your risk category. There are two main ways to lower your cholesterol:
If you are in...
To reduce your risk for heart disease or keep it low, it is very important to control any other risk factors you may have such as high blood pressure and smoking.
Lowering Cholesterol With Therapeutic Lifestyle Changes (TLC)
TLC is a set of things you can do to help lower your LDL cholesterol. The main parts of TLC are:
Even if you begin drug treatment to lower your cholesterol, you will need to continue your treatment with lifestyle changes. This will keep the dose of medicine as low as possible, and lower your risk in other ways as well. There are several types of drugs available for cholesterol lowering including statins, bile acid sequestrants, nicotinic acid, fibric acids, and cholesterol absorption inhibitors. Your doctor can help decide which type of drug is best for you. The statin drugs are very effective in lowering LDL levels and are safe for most people. Bile acid sequestrants also lower LDL and can be used alone or in combination with statin drugs. Nicotinic acid lowers LDL and triglycerides and raises HDL. Fibric acids lower LDL somewhat but are used mainly to treat high triglyceride and low HDL levels. Cholesterol absorption inhibitorrs lower LDL and can be used alone or in combination with statin drugs.
Once your LDL goal has been reached, your doctor may prescribe treatment for high triglycerides and/or a low HDL level, if present. The treatment includes losing weight if needed, increasing physical activity, quitting smoking, and possibly taking a drug.
For more information about lowering cholesterol and lowering your risk for heart disease, write to the NHLBI Health Information Center, P.O. Box 30105, Bethesda, MD, 20824-0105 or call 301-592-8573, or visit the Web sites listed below:
U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES
National Institutes of Health
National Heart, Lung, and Blood Institute
NIH Publication No. 05-3290
Originally printed May 2001
Revised June 2005
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