Body temperature 36.8 ℃ is normal, normal body temperature is not a specific temperature value, but the temperature range, oral sublingual temperature is 36.3-37.2 ℃, rectal temperature 36.5-37.7 ℃, rectal temperature is 0.2-0.5 ℃ higher than the oral temperature, axillary temperature is 36-37 ℃, to traditional mercury thermometer measurement of axillary temperature 5-10 minutes shall prevail. In a healthy state, if the diet is normal and appropriate clothing, the human body temperature is generally relatively constant, remaining at 37 ℃, roughly between 36.2-37.2 ℃, will not change because of changes in external environmental temperature, the measurement of normal human body temperature can choose to measure once in the morning and once in the evening, the most stable value for several days of continuous measurement is the normal body temperature.