Symptoms of chest tightness and shortness of breath can be categorized into physiological and pathological causes. Physiological symptoms of chest tightness and shortness of breath are generally affected by environmental factors, emotional factors, etc. Chest tightness and shortness of breath caused by physiological causes are short in duration and quick in relief. Pathological causes are mainly considered to be caused by respiratory system diseases, such as bronchial asthma, pulmonary obstruction, emphysema and so on. Because respiratory diseases can cause functional damage or obstruction of the respiratory system, the common symptoms are chest tightness, shortness of breath, dyspnea, coughing with phlegm and so on. However, other systemic diseases such as cardiovascular and digestive system can also cause the occurrence of such symptoms, such as myocardial infarction, coronary artery disease, reflux esophagitis, etc., because cardiovascular diseases can also cause patients to experience myocardial ischemic chest tightness and shortness of breath. As for the digestive system, it is considered to be the reflux symptoms of gastrointestinal flatulence, which causes patients to develop pressurized chest tightness and shortness of breath.