If the patient’s temperature is lower than 36°C, it may be due to a low metabolic state, such as hypothyroidism, and it is important to rule out whether the patient’s temperature is currently being measured correctly. Some people may have unexplained hypothermia, and there may be a correlation with familial hereditary causes. If the body temperature is too high, it may be caused by fever, inflammatory infections, or hyperthyroidism. When the patient’s temperature is lower than 36℃, the initial screening of thyroid function can be done, if no cause is found and the patient does not have any uncomfortable symptoms, regular observation can be done, because people with family hereditary hypothermia often do not have any uncomfortable symptoms in the clinic.