LDL (low density lipoprotein) is also known as "bad" cholesterol because it "lets go" of any excess cholesterol in the blood, which can result in a buildup of plaque on the walls of the arteries. Over time, this buildup of plaque can cause a narrowing or hardening of the arteries (atherosclerosis). If you have a high LDL level, you are at an increased risk of developing heart disease. However, lifestyle changes and certain medications can help lower your LDL level.
(For more information, click LDL Cholesterol. This eMedTV article offers more detailed information on how to lower your LDL cholesterol and includes guidelines on what are considered high LDL levels. You can also click any of the links in the box to the right for specific information.)