In a world of good and bad cholesterol, LDL is the bad one. LDL collects in the walls of blood vessels, causing the blockages of atherosclerosis. Higher LDL levels put you at greater risk for a heart attack from a sudden blood clot in an artery narrowed by atherosclerosis.
Getting your LDL cholesterol checked helps determine your risk for heart disease. If your LDL cholesterol is high, treatment can reduce your chance of having a heart attack.