The cause of rapid heartbeat after exercise may be physiological reasons, or pathological reasons such as heart disease, endocrine diseases. 1. Physiological reasons: If the body’s oxygen consumption increases after strenuous exercise, sinus tachycardia may occur, which is especially common in people who lack exercise. 2. Pathological reasons: when the patient’s cardiac insufficiency, the heart pumping function is relatively poor, after strenuous activities, may lead to paroxysmal ventricular tachycardia and other arrhythmias. In addition, the metabolism of patients with hyperthyroidism is accelerated, and after exercise, the body’s oxygen demand increases, which can also cause the heart to beat faster. It is recommended that people with rapid heartbeat after exercise should pay attention to regular exercise, gradual and orderly, and if there is any other discomfort, consult a doctor in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.