Patients who feel chest discomfort usually have the following diseases: First, cardiogenic diseases, such as coronary heart disease, unstable angina, chronic myocarditis, pericarditis, heart valve disease, rheumatic heart disease, congenital heart disease, hypertrophic obstructive cardiomyopathy can cause ischemia, stenosis, spasm of the coronary arteries, resulting in the above clinical symptoms and performance. Second, diseases of the digestive system, such as chronic reflux esophagitis, gastric ulcer duodenal ulcer, bile reflux gastritis, chronic cholecystitis, pancreatitis, etc. will also have the above clinical symptoms. Third, diseases of the respiratory system, such as chronic bronchitis, chronic bronchiectasis, chronic obstructive emphysema, chronic pulmonary heart disease, pulmonary hypertension will show the above symptoms due to insufficient arterial oxygen saturation and low partial pressure of oxygen. Fourth, for the cardiac nerve coronary disorders caused by plant nerve dysfunction will also have the above-mentioned situation.