Slow heart rate may be related to physiological, disease, drugs and other factors. 1. Physiological factors: the heart rate of the elderly will gradually slow down with age, followed by athletes after a long period of exercise will also be slowed down, this is a physiological phenomenon, do not need special treatment. 2. Disease factors: For example, when the thyroid gland is hypothyroid, the body’s metabolic level decreases, and the heart rate will slow down. By the sinus node branch of the blood supply and other effects of sinus bradycardia, can appear slow heart rate. 3. Drug factors: most often seen in taking too much of the drugs that can cause heart rate slowing, such as digitalis poisoning, can inhibit the sinus node, reduce its autonomic, and sinus bradycardia, etc., the heart rate slows down. When the heart rate slows down, it is recommended to consult a doctor, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and to carry out targeted treatment or therapy.