A body temperature of 35.7°C can be physiologically low or pathologically low. Physiological hypothermia is mostly due to cold environment, after taking antipyretic drugs and sweating a lot, or measuring the body temperature for a short period of time, as well as people who have low basal body temperature. Pathological hypothermia indicates poor body resistance, and in traditional Chinese medicine, it belongs to the Yang deficiency constitution and is prone to immune system diseases, such as anemia, Raynaud’s syndrome, chemotherapy and radiation therapy, which can lead to low body temperature. In pathological hypothermia, the cause of the disease should be identified, diagnosed and treated accordingly. Physiological hypothermia does not require special treatment, and the body temperature will return to normal on its own if the temperature change is observed at any time. Hypothermia in the elderly is due to the slower metabolism of the elderly, so the body temperature tends to be low, which also needs to be combined with clinical.