Coronary heart disease is the abbreviation of coronary atherosclerotic heart disease. It refers to a heart disease in which the coronary arteries, the blood vessels that supply nutrients to the heart, become severely atherosclerotic or spastic, causing narrowing or blockage of the coronary arteries, as well as occlusion of the lumen due to thrombosis, resulting in myocardial ischemia and hypoxia or infarction, also known as ischemic heart disease. Coronary heart disease is the most common type of organ lesion caused by atherosclerosis, and is also a common disease that endangers the health of middle-aged and elderly people. The occurrence of this disease is closely related to the degree and number of branches of coronary atherosclerotic stenosis, but a few young patients can develop coronary atherosclerosis even though it is not severe or even without atherosclerosis. There are also some elderly people with atherosclerotic stenosis of coronary arteries, although more serious, do not always have clinical manifestations of coronary heart disease such as chest pain and palpitations. The pathogenesis of coronary artery disease is very complex, but in general, it is more common to be organic, and coronary artery spasm also occurs in coronary arteries with atherosclerosis.