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What are the main causes of a heart attack?
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The most common cause of a heart attack is coronary artery disease, which occurs when plaque builds up in the arteries that supply blood to your heart. This buildup can narrow or block the flow of blood and oxygen to your heart, causing chest pain or discomfort, shortness of breath, nausea, lightheadedness, and other symptoms. Other potential causes of a heart attack include an irregular heartbeat (arrhythmia), high blood pressure, infection, smoking, obesity, and diabetes.