Angina pectoris clinically usually refers to angina pectoris, which is mainly used to describe a painful manifestation in patients with coronary atherosclerotic heart disease, during an acute attack of symptoms. Angina pectoris occurs mainly due to different degrees of stenosis of the coronary arteries, especially when moderate to severe stenosis or more occurs, the relative blood supply to the myocardium is insufficient, resulting in visceral neuropathic pain due to ischemia. It can be reflected in the location of the body surface, and the patient usually feels dullness and colic in the precordial region, called angina pectoris. The typical manifestation of angina is often seen during exertion, emotional excitement or strenuous activity, and the degree is often intense, and there may be corresponding clinical symptoms such as sweating, chest tightness, dyspnea, wheezing, weakness, dizziness, etc. It is usually located in the precordial region, posterior sternum or lower sternum, and may also radiate to the left arm, back, shoulder, jaw, and gums. The duration of the pain is usually from a few minutes to ten minutes, usually not more than half an hour, and can be relieved by quiet rest or nitroglycerin. If this kind of persistent severe chest pain is greater than half an hour, one should be alert to the occurrence of other corresponding diseases such as acute myocardial infarction, aortic coarct or pulmonary embolism, and prompt medical attention is required. If angina is not clearly angina, it also needs to be differentiated from other heart diseases such as arrhythmia, heart failure, and non-cardiogenic diseases such as pulmonary diseases, pneumothorax, pulmonary embolism, bronchial asthma, or digestive system diseases such as reflux esophagitis, gastric ulcer, acute pancreatitis, etc., and treated for the cause after diagnosis.