A body temperature of 35.5°C is not normal. The normal range of body temperature varies with different measurements. Axillary body temperature is normally 36-37°C, oral body temperature is normally 36.7-37.7°C, and anal body temperature is normally 36.5-37.5°C. Regardless of the measurement method, a body temperature of 35.5°C is abnormal and belongs to hypothermia. Low body temperature may be caused by environmental temperature, for example, when the temperature is relatively low, it may lead to a drop in body temperature and body cold, but usually no other uncomfortable symptoms. It can also be caused by illnesses, such as anemia and low blood pressure, which often slow down blood circulation and cause hypothermia. It is important to keep your body warm and to take your temperature several times. If the temperature does not return to normal, you should go to the hospital in time to find out the cause of the illness and follow the doctor’s instructions.