Body temperature is higher at night. Body temperature fluctuates with the change of day and night, and usually the fluctuation is not more than 0.5℃. The body temperature is low when a person is awake, quiet and fasting, and increases in the afternoon or after exercise. However, the body temperature will reach a balance through the process of heat production and heat dissipation, while the body temperature by the hypothalamus thermoregulation center for regulation, if the body temperature is too high or too low, for the health are harmful, it is recommended to go to the hospital in a timely manner to seek medical attention, and according to the cause of the disease to give symptomatic treatment, so as to make the body temperature back to the normal level.