Coronary artery disease which is also called coronary heart disease is a result of plaque buildup in the arteries thereby blocking blood flow and improves the risk of heart attack and stroke. The plaque buildup in the arteries is defined as the Atherosclerosis. Due to this disease arteries become narrow and rigid resulting in restriction of blood flow to the heart. Symptoms include Chest pain (angina), Shortness of breath and completely blocked coronary artery may lead to heart attack. CAD also weakens the muscles of a heart resulting in Heart failure and arrhythmias.It is the most common type of heart diseases and the main cause of heart attack.