Heart disease encompasses all types of cardiovascular diseases, and all diseases related to the heart can be called heart disease; and coronary heart disease is only one type of heart disease. Heart diseases can be classified by etiology into congenital, rheumatic, atherosclerotic, hypertensive, pulmonary, infectious, endocrine and metabolic, anemic, toxic and other types. According to the pathological anatomy, it can be classified into coronary artery lesions, myocardial lesions, endocardial lesions, pericardial lesions, cardiac tumors, and various congenital malformations of the heart and great vessels. According to the pathophysiological classification, it can be divided into angina pectoris, myocardial infarction, arrhythmia, heart failure, pulmonary edema, cardiogenic shock, etc. Coronary artery disease is a type of heart disease that refers specifically to diseases of the coronary arteries. Coronary artery disease is a heart disease caused by atherosclerotic plaque in the inner wall of coronary arteries, which causes narrowing of the coronary artery lumen or blockage of blood vessels by plaque shedding, resulting in insufficient blood supply to the heart muscle and causing myocardial ischemia and hypoxia. Therefore, the concept of coronary heart disease is narrower than that of heart disease, involving only the coronary arteries. Therefore, the difference between coronary heart disease and heart disease is that it is a type of heart disease with a narrower concept than heart disease.