Body straightening stretching chest pain is considered to be caused by the following reasons: first of all, it is considered to be a symptom of pain in the intercostal muscles of the chest, usually due to the usual lack of exercise, not enough warm-up before carrying out strenuous activities, and local muscle strain after exercise, triggering local sterile inflammation resulting in painful symptoms. In addition to the above-mentioned causes, hidden pain in the chest is considered to be related to stomach diseases or heart diseases. Stretching movements when suffering from stomach diseases or heart diseases may lead to painful symptoms in the chest, and patients are advised to undergo gastroscopy and electrocardiography. Muscle strain will recover on its own after a period of relief, so it is not serious. Stomach disease or heart disease will cause more serious damage to the body, it is recommended that patients with the above symptoms should promptly go to a regular hospital for examination to exclude the possibility of organic lesions.