There are three main possibilities for chest pain after exercise: first, physiological causes, mainly refers to the chest pain caused by lactic acid accumulation due to increased anaerobic exercise in the chest wall during exercise, which does not require special treatment. Second, pneumothorax, common in young and middle-aged patients, manifesting as diffuse pinprick-like pain in the chest, which can be accompanied by progressive dyspnea and requires closed chest drainage. Third, coronary heart disease, because the heart pumps more blood during exercise, when the coronary artery blood supply is not enough can appear angina pectoris, manifested as anterior heart area pressure pain and can be radiated to the back, should be nitroglycerin sublingual. If you have breast pain after exercise, you should consider having cystic hyperplasia of the breast. There are various causes of chest pain after exercise, so you should clarify the cause of the pain and actively cooperate with the specialist for treatment, which is mostly curable.