Heart rate 46 for normal people belongs to bradycardia, can be divided into physiological and pathological causes, such as physiological causes are generally normal phenomenon. 1. Physiological reasons: normal people in the daytime quiet state heart rate is mostly in 60 ~ 100 times / min, but for the physical quality of athletes, its quiet state heart rate may be only 40 ~ 60 times / min, for the normal phenomenon. In addition, some normal people’s heart rate in sleep state can also be 46 times/minute, without special treatment. 2. Pathological causes: such as sinus node, atrioventricular node and other lesions, pathological sinus node syndrome, atrioventricular block, etc., can also lead to bradycardia, need to consult a doctor in a timely manner, under the guidance of the physician to choose medication, such as atropine, or implantation of pacemakers to treat. A heart rate of 46 beats per minute is recommended for a thorough examination if physiologic causes are excluded or if accompanied by symptoms such as dizziness.