Cad is caused by plaque buildup in the walls of the arteries that supply blood to heart and to the body called (coronary arteries) and other to the other parts of the body that supply the blood.

Plaque is made up of deposits of cholesterol and other substances in the artery. Plaque buildup cause the inside of the arteries to narrow over time which can half or totally block the blood flow in the body. This process is called atherosclerosis.