There are differences in body temperature between different parts of the human body, morning and evening, and between men and women. Normal body temperature has a relatively stable range, but it is not constant. The oral temperature of normal people is 36.3℃ ~ 37.2℃, the axillary temperature is 0.3℃ ~ 0.6℃ lower than the oral temperature, and the rectal temperature is 0.3℃ ~ 0.5℃ higher than the oral temperature. In a day, the body temperature is the lowest at 2-5 am and the highest at 5-7 pm, but the temperature difference within a day should be less than 65438 0℃. In addition, women's body temperature is generally about 0.3℃ higher than that of men. Women's body temperature will also change slightly during menstruation. Above normal body temperature is a fever.