what is the major causes of heart attack?

Heart attacks most often result from coronary heart disease (also called coronary artery disease or ischemic heart disease). The most common cause is atherosclerosis ("hardening of the arteries"), a build-up of fatty deposits called plaque. Over time, plaque clogs and narrows the arteries and other blood vessels, and slows or blocks the flow of blood to the heart and elsewhere. Sometimes, the surface of plaques can rupture or tear, which can cause blood clots to form that block the arteries. A complete or near-complete blockage of the coronary arteries results in a heart attack. The signs and symptoms of a heart attack vary from person to person: # An intense aching in the left side or center of the chest Sometimes, the pain radiates into the neck, back, arms or jaw # A feeling of extreme pressure, fullness, or tightness in the chest # Nausea, dizziness, weakness, shortness of breath, or a cold sweat also can be experienced. These are the main symtoms.