Cholesterol

Why is a high cholesterol level unhealthy?

While some cholesterol is needed for good health, too much cholesterol in your blood can raise your risk of having a heart attack or stroke.

The extra cholesterol in your blood may be stored in your arteries (blood vessels) and cause them to narrow. (This is called atherosclerosis.) Large deposits of cholesterol can completely block an artery, so the blood can't flow through.

If an artery that supplies blood to your heart becomes blocked, a heart attack can occur. If an artery that supplies blood to your brain becomes blocked, a stroke can occur.

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