The causes of slow heartbeat can be categorized into physiological and pathological. Physiological causes include athletes and pathological causes include hypothyroidism. Slow heartbeat is clinically known as bradycardia, which refers to a heart rate of less than 60 beats per minute in adults. Physiological factors of bradycardia are physical differences, such as some athletes, their heart beats slower than normal due to their physical condition, usually within 50~60 beats per minute, but without any discomfort. Pathologic factors of bradycardia such as intracranial disease, severe hypoxia, hypothermia, hypothyroidism, obstructive jaundice, vasovagal syncope, sinus arrest, sinus block, atrioventricular block, etc., in addition to the application of medications such as metoprolol, amiodarone, digitalis and other drugs can also cause sinus bradycardia. Generally speaking, the heart beats slowly, such as the heart rate is not less than 50 times per minute, no obvious discomfort, and no obvious triggering factors, generally no special treatment. If the heart rate is lower than 40 times per minute, and there is weakness, palpitations, chest tightness, shortness of breath and other symptoms, it is necessary to go to the regular hospital in a timely manner, to clarify the cause of the disease and targeted treatment, the specific use of medication, please follow the doctor’s instructions.