Chest tightness and chest pain should be alert to the possibility of heart disease, lung disease, and digestive system disease. Multi-system diseases can lead to the clinical manifestation of chest tightness and chest pain. 1. Heart diseases such as myocardial infarction, arrhythmia, myocardial ischemia can lead to chest tightness and chest pain. 2. Respiratory diseases such as pulmonary embolism, pneumonia, pleural effusion, pleurisy and lung occupational disease can also cause chest tightness and chest pain. 3. Digestive system diseases such as gastritis, gastric ulcer, reflux esophagitis can also cause chest tightness and chest pain. The symptoms of chest tightness and chest pain suggest that the patient early professional hospital cardiology, respiratory or gastroenterology and other related departments to improve the relevant auxiliary examinations to clarify the cause of the disease, under the guidance of a professional doctor to standardize the treatment to avoid delaying the condition.