This report comprises of the Epidemiology of Coronary Artery Diseases. The acquaintance of Coronary Artery Diseases has made extraordinary paces during past 15years. Data shows that Coronary Artery Diseases are the foremost basis of the death in individuals. Therefore, new procedures like “electron beam computed tomography” have allowed the researchers and investigators to perceive the originators of CAD in asymptomatic patients.