If the patient has recently had frequent angina: 1, to consider heart disease aggravation, such as coronary heart disease, or various factors leading to disease of the heart muscle, often in the case of myocarditis will have pain in the precordial region. 2, if the patient has heart valve disease, hypertensive heart disease, rheumatic heart disease, these conditions will also cause ischemia and lack of oxygen to the heart muscle, will also trigger angina of varying degrees. 3, if If the patient has malignant arrhythmia or heart failure caused by various reasons, the symptoms of angina pectoris will appear. 4. If the patient has frequent angina pectoris recently, also consider respiratory system diseases, such as massive pleurisy, lung infection or pleural effusion, when there will also be pain in the precordial area. 5. If the patient has serious endocrine metabolic diseases, in thyroid dysfunction or adrenal gland function This is a common symptom when the patient has a serious endocrine metabolic disease, such as thyroid dysfunction or adrenal dysfunction.