If the body temperature is lower than 36℃, the first thing to do is to clarify the specific cause of the disease, and then carry out the treatment for the cause. Common causes include environmental factors, physical factors, disease factors, etc. It is recommended to consult a doctor in a timely manner to clarify the cause of the disease and then treat it under the doctor’s guidance. 1. Environmental factors: If you are in a cold environment for a long time and wearing too little clothing, your body temperature may be lower than 36℃. After leaving the cold environment and increasing clothing, the body temperature will gradually return to normal. 2. Physical factors: Due to the differences in the physical condition of each person, some people are born with a low body temperature. If the body temperature is lower than 36℃, and there are no other uncomfortable symptoms, it may be due to physical factors. Usually the elderly in the night sleep state, can also lead to the phenomenon of body temperature below 36 degrees, do not worry too much, pay attention to observation, when the symptoms of hypothermia is more serious timely consultation and treatment. 3. Disease factors: usually hypothyroidism, iron deficiency anemia and other diseases, may lead to body temperature below 36 ℃ symptoms. You can take oral levothyroxine sodium tablets, ferrous gluconate and other medications as prescribed by the doctor, and you need to eat more iron-rich foods in your daily life, such as animal offal, jujubes, cherries, animal blood products and so on.