Why do some young men have heart attacks? From Harvard Men's Health Watch
As many as 10% of all heart attacks in men occur before age 45. As with heart attacks in older adults, about 80% of these attacks stem from coronary artery disease—that is, cholesterol-filled blockages in the arteries that serve the heart. Other causes of early heart attacks in men include abnormalities of one or more arteries, blood clots that form elsewhere and are carried to the coronary arteries, disorders of the clotting system, spasm or inflammation of the arteries, chest trauma, and drug abuse.
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