This most often happens because of plaque, a sticky substance that can build up on the insides of your arteries (similar to how pouring grease down your kitchen sink can clog your home plumbing). The vast majority of heart attacks occur because of a blockage in one of the blood vessels that supply your heart. The location of the blockage, the length of time that blood flow is blocked and the amount of damage that occurs determine the type of acute coronary syndrome.* See the Electrocardiogram description in the Diagnosis & Tests section for an explanation of STEMI and non-STEMI heart attacks.
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