The cause of accelerated heartbeat and chest tightness after strenuous exercise is due to increased myocardial oxygen consumption and lack of myocardial blood supply and perfusion. A dramatic acceleration of the heartbeat occurs after strenuous exercise, and the acceleration of the heartbeat leads to a significant increase in myocardial oxygen consumption. Tachycardia will also lead to a decrease in ventricular filling, the heart’s ejection of blood will appear to be reduced, will also aggravate the reduction of blood supply to the heart muscle itself, the two reasons together, so that the heart appears to be insufficient blood supply, resulting in chest tightness symptoms. The symptoms of chest tightness and shortness of breath caused by strenuous exercise are mostly physiological changes, the symptoms are obvious to stop exercising in time, or reduce the amount of exercise, reduce the demand for oxygen of the heart muscle, the heart rate will gradually decline, and the symptoms will gradually be relieved. Usually exercise to gradually increase the amount of exercise, so that the heart has a gradual process of adaptation to reduce the occurrence of chest tightness and shortness of breath. If the rapid heart rate and chest tightness after strenuous exercise cannot be improved after rest, it should be considered that there may be other causes, especially pathological causes, such as pneumothorax, myocardial infarction, etc., in which case, please go to the hospital in time and follow the doctor’s instructions for treatment, so as to avoid the adverse consequences.