Due to accumulation of layer cholesterol inside the artery, not only the artery becomes brittle and narrow, but sometimes, this layer inside the artery suddenly. Subsequently, a complicated blood clotting process begins and within minutes, the blood stops in blood pressure, an acute stressful situation, smoking or strenuous exertion. As the blood supply is suddenly cut off and the heart start losing life. Due to this, a part of the heart becomes dead; heartbeats and blood pressure alter acutely and the patient experiences heavy chest pain, sweating, restlessness, nausea or feeling of impending doom. This is called a heart attack.