Both silent and common heart attacks occur when the heart does not get a sufficient supply of oxygen-rich blood. The reason that might happen is usually ischemic heart disease, which is a condition where a waxy substance called plaque builds up inside the coronary arteries. The plaque creates blockage, which prevents the blood from reaching the heart muscle. Blood flow must be restored quickly, otherwise, that section of the heart begins to die.
Although the symptoms of a silent heart attack are not severe and can often go unnoticed, it is just as serious as a common heart attack!
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