Normal people’s body temperature fluctuation will not exceed 0.5 ℃ a day, the body’s body temperature will be through the process of heat production and heat dissipation to achieve balance, while the body’s body temperature by the hypothalamus thermoregulation center regulation. Usually normal people in awake, quiet, fasting body temperature is low, and in the nervousness, emotional, food or satiety after the body temperature has increased. In addition, a woman’s body temperature increases during the premenstrual period, which can be used to assess the health of the body. High or low body temperatures can be detrimental to the body, and it is recommended to consult a doctor and give the appropriate medication according to the cause of the problem.