Your heart receives its blood supply via blood vessels called the coronary arteries. In coronary artery disease (CAD), the blood flow to the heart is reduced because of the blockages in these vessels This results in reduced oxygen supply to the heart. It may cause mild to severe chest pain, called angina. This pain can spread to the arms or jaw. Such an event could happen during stressful times, physical activities such as work or exercise, or even at rest. Other symptoms that may accompany chest pain are dizziness, palpitations, and excessive sweating (cold sweat). When a part of the heart muscle is damaged because of a blocked artery, it is called a Sign Of Heart Attack.