Many people don't even know there's a problem until an artery is clogged by a blood clot and they have a heart attack.
But there may be warning signs of coronary artery disease, like frequent chest pain called angina. If it completely blocks your artery, it cuts off the blood supply to part of your heart.
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Mention heart disease, and most people picture a heart attack.
If you think you're having a heart attack, call 911 right away, even if you're not sure. Arrhythmias can make your heart race, slow down, or quiver.