What is cholesterol?
Cholesterol is a waxy, fat-like substance that's found in all the cells in your body. Your body needs some cholesterol to make hormones, vitamin D, and substances that help you digest foods. Your body makes all the cholesterol it needs. Cholesterol is also found in foods from animal sources, such as egg yolks, meat, and cheese.
If you have too much cholesterol in your blood, it can combine with other substances in the blood to form plaque. Plaque sticks to the walls of your arteries. This buildup of plaque is known as atherosclerosis. It can lead to coronary artery disease, where your coronary arteries become narrow or even blocked.
What are LDL and HDL?
There are two main types of cholesterol:
- HDL stands for high-density lipoproteins. It is called the "good" cholesterol because it carries cholesterol from other parts of your body back to your liver. Your liver then removes the cholesterol from your body.
- LDL stands for low-density lipoproteins. It is called the "bad" cholesterol because a high LDL level leads to a buildup of cholesterol in your arteries.
What causes high cholesterol?
The most common cause of high cholesterol is an unhealthy lifestyle. This can include
- Unhealthy eating habits, such as eating lots of bad fats. One type, saturated fat, is found in some meats, dairy products, chocolate, baked goods, and deep-fried and processed foods. Another type, trans fat, is in some fried and processed foods. Eating these fats can raise your LDL (bad) cholesterol.
- Lack of physical activity, with lots of sitting and little exercise. This lowers your HDL (good) cholesterol.
- Smoking, which lowers HDL cholesterol, especially in women. It also raises your LDL cholesterol.
Genetics may also cause people to have high cholesterol. For example, familial hypercholesterolemia (FH) is an inherited form of high cholesterol. Other medical conditions and certain medicines may also cause high cholesterol.
What can raise my risk of high cholesterol?
A variety of things can raise your risk for high cholesterol:
- Age. Your cholesterol levels tend to rise as you get older.
- Heredity. High blood cholesterol can run in families.
- Weight. Being overweight or having obesity raises your cholesterol level.
- Race. Certain races may have an increased risk of high cholesterol. For example, African Americans typically have higher HDL and LDL cholesterol levels than whites.
- Weight. Being overweight or having obesity raises your cholesterol level.
What health problems can high cholesterol cause?
If you have large deposits of plaque in your arteries, an area of plaque can rupture (break open). This can cause a blood clot to form on the surface of the plaque. If the clot becomes large enough, it can mostly or completely block blood flow in a coronary artery.
Plaque also can build up in other arteries in your body, including the arteries that bring oxygen-rich blood to your brain and limbs. This can lead to problems such as carotid artery disease, stroke, and peripheral arterial disease.
How do I know if I have high cholesterol?
There are usually no signs or symptoms that you have high cholesterol. There is a blood test to measure your cholesterol level. When and how often you should get this test depends on your age, risk factors, and family history. The general recommendations are:
For people who are age 19 or younger:
- The first test should be between ages 9 to 11
- Children should have the test again every 5 years
- Some children may have this test starting at age 2 if there is a family history of high blood cholesterol, heart attack, or stroke
For people who are age 20 or older:
- Younger adults should have the test every 5 years
- Men ages 45 to 65 and women ages 55 to 65 should have it every 1 to 2 years
How can I lower my cholesterol?
If the lifestyle changes alone do not lower your cholesterol enough, you may also need to take medicines. There are several types of cholesterol-lowering drugs available, including statins. If you take medicines to lower your cholesterol, you still should continue with the lifestyle changes.
Some people with familial hypercholesterolemia (FH) may receive a treatment called lipoprotein apheresis. This treatment uses a filtering machine to remove LDL cholesterol from the blood. Then the machine returns the rest of the blood back to the person.
NIH: National Heart, Lung, and Blood Institute
- 5 Tips: What You Should Know About High Blood Cholesterol (National Center for Complementary and Integrative Health)
- High Blood Cholesterol (National Heart, Lung, and Blood Institute)
Treatments and Therapies
- Cholesterol Drugs for People 75 and Older: When You Need Them and When You Don't (Consumers Union of U.S.) - PDF
- Cholesterol Medicines: MedlinePlus Health Topic (National Library of Medicine)
- Cholesterol: Top Five Foods to Lower Your Numbers (Mayo Foundation for Medical Education and Research)
- How to Lower Cholesterol: MedlinePlus Health Topic (National Library of Medicine)
- Statins: MedlinePlus Health Topic (National Library of Medicine) Also in Spanish
- Are Chicken Eggs Good or Bad for My Cholesterol? (Mayo Foundation for Medical Education and Research) Also in Spanish
- Cholesterol Level: Can It Be Too Low? (Mayo Foundation for Medical Education and Research) Also in Spanish
- Common Misconceptions about Cholesterol (American Heart Association)
- Dining Out Tips by Cuisine (American Heart Association)
- Overview of Cholesterol and Lipid Disorders (Merck & Co., Inc.) Also in Spanish
- Xanthelasma Palpebrarum (Logical Images)
- Genetics Home Reference: cerebrotendinous xanthomatosis (National Library of Medicine)
- Genetics Home Reference: desmosterolosis (National Library of Medicine)
- Genetics Home Reference: familial HDL deficiency (National Library of Medicine)
- Genetics Home Reference: hepatic lipase deficiency (National Library of Medicine)
- Genetics Home Reference: hypercholesterolemia (National Library of Medicine)
- Genetics Home Reference: Tangier disease (National Library of Medicine)
- Learning about Familial Hypercholesterolemia (National Human Genome Research Institute)
Health Check Tools
- Cholesterol IQ Quiz (American Heart Association)
Statistics and Research
- Big, Fat World of Lipids (National Institute of General Medical Sciences)
- Cholesterol Facts and Statistics (Centers for Disease Control and Prevention) Also in Spanish
- High Cholesterol and Complementary Health Practices: What the Science Says (National Center for Complementary and Integrative Health)
- ClinicalTrials.gov: Cholesterol (National Institutes of Health)
- ClinicalTrials.gov: Hypercholesterolemia (National Institutes of Health)
- ClinicalTrials.gov: Hyperlipidemias (National Institutes of Health)
- ClinicalTrials.gov: Hyperlipoproteinemia Type II (National Institutes of Health)
- ClinicalTrials.gov: Hyperlipoproteinemia Type III (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: Cardiovascular Guideline Skepticism vs Lifestyle Realism?
- Article: Persistent High Non-High-Density Lipoprotein Cholesterol in Early Childhood: A Latent...
- Article: High prevalence of non-communicable diseases and associated risk factors amongst...
- Cholesterol -- see more articles
- Treating high cholesterol -- see more articles
- Cholesterol and lifestyle (Medical Encyclopedia) Also in Spanish
- Cholesterol testing and results (Medical Encyclopedia) Also in Spanish
- Familial combined hyperlipidemia (Medical Encyclopedia) Also in Spanish
- Familial hypercholesterolemia (Medical Encyclopedia) Also in Spanish
- High cholesterol - children (Medical Encyclopedia) Also in Spanish