A heart attack occurs when the flow of blood to the heart is blocked. The blockage is most often a buildup of fat, cholesterol and other substances, which form a plaque in the arteries that feed the heart (coronary arteries). Sometimes, a plaque can rupture and form a clot that blocks blood flow.
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Heart attacks are usually thought to affect people over the age of 50. However, in reality, they can occur at any age. In fact, about 8 in every 100 heart attacks occur in those under 55, and 1 in 4 heart attacks in women affects an under-60.
