Cholesterol is a type of lipid in the blood. High cholesterol is an abnormally high level of cholesterol in the blood.

There are different types of cholesterol in your blood including:

  • Low density lipoproteins (LDL)—causes build up of cholesterol and other fats in the blood vessels. Known as bad cholesterol because high levels can cause disease in the arteries and heart disease.
  • High density lipoproteins (HDL)—can remove cholesterol and other fats from the blood. Known as good cholesterol because it may protect against heart disease.