When there is too much cholesterol in your blood, it builds up in the walls of your arteries, causing a process called atherosclerosis, a form of heart disease. The arteries become narrowed and blood flow to the heartmuscle is slowed down or blocked. The blood carries oxygen to the heart, and if not enough blood and oxygen 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.
There are two forms of cholesterol that many people are familiar with: Low-density lipoprotein (LDL or “bad” cholesterol) and high-density lipoprotein (HDL or “good” cholesterol.) These are the form in which cholesterol travels in the blood.
LDL is the main source of artery-clogging plaque. HDL actually works to clear cholesterol from the blood.