Chest pain after exercise is partly caused by physiological factors, mainly including thoracic movement and muscle tension. Excluding physiological factors, some diseases can also cause related symptoms, such as coronary heart disease, pleurisy, sternal destruction and so on. 1. Physiological factors (1) Thoracic movement: during strenuous exercise, the amplitude of thoracic movement increases, which will cause the surrounding bone and joints to be pulled, and the lack of exercise in general will cause chest pain afterward. (2) Muscle tension: during strenuous exercise, anaerobic fermentation occurs in the muscle, and the corresponding condition will lead to the accumulation of lactic acid and cause the corresponding symptoms. 2. Pathological factors (1) Coronary heart disease: the most common cause of chest pain after exercise is mainly due to vasoconstriction, resulting in insufficient blood supply to the heart muscle. (2) Pleurisy: inflammation of the pleura will cause repeated friction and stimulation during strenuous exercise, causing chest pain and discomfort. (3) Destruction of the sternum: trauma or tumor causes destruction of the sternum, which can aggravate the irritation and cause pain during exercise. If the chest pain persists after exercise, you need to consult a doctor for observation and standardized treatment under the guidance of a clinician after confirming the cause of the disease.