Cigarette smoking damages the walls of your blood vessels, making them likely to have cholesterol rich plaques rupture and have heart attacks. Smoking may also lower your level of HDL cholesterol by as much as 15 percent.

Also, after women go through menopause, their bad cholesterol levels tend to go up. There is also a rare type of inherited high cholesterol that often leads to early heart disease. Some people inherit a condition called familial hypercholesterolemia, which means that very high cholesterol levels run in the family. Other people, especially people for whom diabetes runs in the family, inherit high triglyceride levels. Triglycerides are another type of blood fat that can also push up cholesterol levels. People with high blood triglycerides usually have lower HDL cholesterol and a higher risk of heart attack and stroke. Progesterone, anabolic steroids and male sex hormones (testosterone) also lower HDL cholesterol levels.

So we can make a conclusion that the main therapy is to change your lifestyle. This includes controlling your weight, eating foods low in saturated fat and cholesterol, exercising regularly, not smoking and, in some cases, drinking less alcohol.

But depending on your risk factors, if healthy eating and exercise don't work after about 6 months to 1 year, your doctor may suggest medicine to lower your cholesterol level.

Now there are very effective medications called "statins," such as Lipitor.