Coronary heart disease is a cardiovascular disease, and angina is the main symptom of coronary heart disease. Coronary heart disease is a heart disease caused by atherosclerosis of coronary arteries, which causes narrowing or blockage of blood vessel lumen, resulting in myocardial ischemia and hypoxia or even necrosis. Coronary heart disease has chest tightness and chest pain as typical symptoms, and this discomfort of chest tightness and chest pain is known as angina pectoris. The relative lack of blood supply to the myocardium during the attack of coronary heart disease leads to ischemic pain of the myocardium, which is known as angina, and the patient mostly presents with a dull and tight feeling in the precordial region. The pain rarely lasts more than 10 minutes and can disappear within 1-2 minutes after rest or nitroglycerin. The triggering factors of angina are mainly exertion, high-intensity activities and over-emotional excitement. When angina occurs, patients with coronary artery disease need to suspend ongoing activities, rest in bed, actively seek medical treatment after the pain is relieved, and review regularly. If the condition is serious, surgery is needed to improve the blood supply to the coronary arteries to relieve the symptoms.