The professional name of pain in the middle of chest is post-sternal pain, which is divided into physiological and pathological, and the pathological causes include cardiovascular disease, respiratory disease and digestive disease. 1. Physiological: if just after strenuous exercise or inhalation of cold air, there will be pain behind the sternum, which is a normal physiological phenomenon, and can be recovered by resting well, without additional treatment. 2. Pathological: if you suffer from cardiovascular diseases, such as angina pectoris, coronary heart disease, myocarditis and myocardial infarction, etc., you will experience retrosternal pain; if you suffer from respiratory diseases, such as pneumonia, etc., you will also experience this symptom; and gastrointestinal diseases, such as gastric ulcers, reflux oesophagitis or gastritis, etc., you will also experience retrosternal pain. If post-sternal pain is suspected to be pathologic, it is recommended that the patient go to the hospital in a timely manner.