There are physiological and pathological reasons for stretching and pain in the middle of the chest. Pathological reasons include reflux esophagitis, angina pectoris and costochondritis. 1. Physiological reasons: after strenuous exercise, mental stress, sleep deprivation, anxiety and other factors can lead to the symptoms of pain in the middle of the chest during activities. Ensuring sufficient rest and practicing good work and rest habits can effectively alleviate the symptoms. 2. Pathological factors: patients with reflux esophagitis due to the decline in anti-reflux function, when stretching can lead to reflux of gastric contents, causing burning sensation and pain behind the sternum. Angina pectoris insufficient blood supply leads to hypoxia and ischemia when activities are carried out oxygen consumption increases thus appearing chest compression pain. Costochondritis is an inflammatory reaction that occurs between the sternum and the ribs that involves the chest causing pain when performing activities. When the patient experiences discomfort, he or she needs to go to the hospital immediately.