Cholesterol is a fat (also called a lipid) that your body needs to work properly. Too much bad cholesterol in your blood can increase your chance of getting heart disease, stroke, and other problems.

Common medical terms for high blood cholesterol are lipid disorder, hyperlipidemia, or hypercholesterolemia, with the last being the most precise.

Cholesterol - high; Lipid disorders; Hyperlipoproteinemia; Hyperlipidemia; Dyslipidemia; Hypercholesterolemia

Common conditions include: Familial Hypercholesterolemia

There are many types of cholesterol. The ones talked about most are:

• Total cholesterol -- all the cholesterols combined
• High density lipoprotein (HDL) cholesterol -- often called "good" cholesterol
• Low density lipoprotein (LDL) cholesterol -- often called "bad" cholesterol

For many people, abnormal cholesterol levels are partly due to lifestyle choices. This often includes eating a diet that is high in fat. Other lifestyle factors are:

• Being overweight
• Lack of exercise

Some health conditions can also lead to abnormal cholesterol, including:

• Diabetes
• Kidney disease
• Polycystic ovary syndrome
• Pregnancy and other conditions that increase levels of female hormones
• Underactive thyroid gland

Medicines such as certain birth control pills, diuretics (water pills), beta-blockers, and some medicines used to treat depression may also raise cholesterol levels. Several disorders that are passed down through families lead to abnormal cholesterol and triglyceride levels. They include:

• Familial combined hyperlipidemia
• Familial dysbetalipoproteinemia
• Familial hypercholesterolemia
• Familial hypertriglyceridemia

Smoking does not cause higher cholesterol levels, but it can reduce your HDL (good) cholesterol.

Steps you can take to improve your cholesterol levels and to help prevent heart disease and a heart attack include:

• Quit smoking. This is the single biggest change you can make to reduce your risk of heart attack and stroke.
• Eat foods that are naturally low in fat. These include whole grains, fruits, and vegetables.
• Use low-fat toppings, sauces, and dressings.
• Avoid foods that are high in saturated fat.
• Exercise regularly.
• Lose weight if you are overweight.

Your provider may want you to take medicine for your cholesterol if lifestyle changes do not work. This will depend on:

• Your age
• Whether or not you have heart disease, diabetes, or other blood vessel problems
• Whether you smoke or are overweight
• Whether you have high blood pressure or diabetes

You are more likely to need medicine to lower your cholesterol:

• If you have heart disease or diabetes
• If you are at high risk for heart disease (even if you do not yet have any heart problems)
• If your LDL cholesterol is 190 mg/dL (4.92 mmol/L) or higher

Almost everyone else may get health benefits from LDL cholesterol that is lower than 160 to 190 mg/dL (4.14 mmol/L to 4.92 mmol/L).

There are several types of drugs to help lower blood cholesterol levels. The drugs work in different ways. Statins are one kind of drug that lowers cholesterol and has been proven to reduce the chance of heart disease. Other drugs are available if your risk is high and statins do not lower your cholesterol levels enough. These include ezetimibe and PCSK9 inhibitors.

High cholesterol levels can lead to hardening of the arteries, also called atherosclerosis. This occurs when fat, cholesterol, and other substances build up in the walls of arteries and form hard structures called plaques.

Over time, these plaques can block the arteries and cause heart disease, stroke, and other symptoms or problems throughout the body.

Disorders that are passed down through families often lead to higher cholesterol levels that are harder to control.

Published Date: January 01, 2023
Published By: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Internal review and update on 02/19/2024 by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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Grundy SM, Stone NJ, Bailey AL, et al. 2018 AHA/ACC/AACVPR/AAPA/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA guideline on the management of blood cholesterol: executive summary; a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines. J Am Coll Cardiol. 2019;73(24):3168-3209. PMID: 30423391 pubmed.ncbi.nlm.nih.gov/30423391/.

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US Preventive Services Task Force website. Final recommendation statement. Lipid disorders in children and adolescents: Screening. www.uspreventiveservicestaskforce.org/uspstf/recommendation/lipid-disorders-in-children-screening. Updated July 18, 2023. Accessed February 16, 2024.