There is no way to bring down the heartbeat quickly. The causes of fast heartbeat include physiological factors, such as after exercise, which do not need special treatment, and pathological factors, such as hyperthyroidism and myocardial infarction, which can be treated by medication and surgery. 1. After exercise: when people are exercising, the sympathetic nerves can be excited, leading to fast heartbeat after exercise. Fast heartbeat caused by this reason does not need special treatment and can be relieved by itself after rest. 2. Hyperthyroidism: patients may have irritability, tachycardia, weight loss, hyperphagia and other phenomena. Under doctor’s guidance, patients can choose anti-thyroid drugs, such as imidazole formamide and propylthiothiophene, or use beta-blockers, such as metoprolol and propranolol, to improve the symptoms, or under doctor’s advice, undergo surgery, such as subtotal thyroidectomy, to treat the symptoms. 3. Myocardial infarction: patients may have chest tightness, dyspnea, rapid heartbeat, chest pain and other phenomena. Should immediately seek medical attention, under the guidance of the doctor, thrombolysis (such as urokinase, streptokinase, etc.) or interventional therapy to save the dying myocardium, in order to prevent the infarction from expanding the scope of the infarction, and then follow the doctor’s instructions for symptomatic treatment. In addition, heart failure, chronic obstructive pulmonary disease, digitalis intoxication with hypokalemia can also cause rapid heartbeat, patients should go to the hospital in time, identify the cause of the disease, and then follow the doctor’s instructions for treatment.