Is high cholesterol associated with heart blockage?

High levels of cholesterol in the blood, especially LDL cholesterol, lead to an increased risk of having a heart attack or developing blockages in the arteries, states the National Heart, Lung, and Blood Institute. Excess cholesterol builds up in artery walls and eventually narrows the arteries, causing decreased blood flow.

Cholesterol deposits in the arteries can also completely block the artery, cutting off blood flow and causing a heart attack, according to the National Heart, Lung, and Blood Institute. Ways to reduce cholesterol levels include lowering the amount of saturated fat and cholesterol in the diet, maintaining a healthy weight and engaging in regular physical activity.