Heart attack generally is due to blockage of Coronary arteries supplying blood to heart. The blockage can be due to Cholesterol and sometimes thrombus and can occur over a period of time and may present as chest pain (Angina) or heart attack or breathlessness and with no complaints in Diabetics One needs to have tests, life style changes and stop smoking tobacco and must walk 5 km/day if there are no other risk factors.