Ischaemic heart disease, also spelled ischemic heart disease, is a form of heart disease that occurs when the heart receives an inadequate supply of blood. Ischemic heart disease is a condition characterised by recurrent chest pain or discomfort. This condition arises as a result of a portion of the heart not receiving sufficient blood supply. Exertion or excitement, both of which require a greater volume of blood flow to the heart, are the most common triggers for this condition. Ischemic heart disease is more commonly referred to by its more common name, coronary heart disease. Ischemic heart disease is caused by cholesterol particles in the blood accumulating on the walls of the arteries that supply blood to the heart. This can lead to a reduction in blood flow to the heart muscle. Eventually, deposits called plaques may form. These deposits cause the arteries to become more constricted, which eventually prevents blood from flowing through them. As a result of this reduction in blood flow, a lower amount of oxygen is supplied to the muscle of the heart.