Body temperature at 35.5 degrees is lower than the normal level, may be physiological factors do not need to take medication, may be pathological factors need to take medication (such as hypothyroidism, need to take levothyroxine sodium tablets for treatment), need to be specifically analyzed. 1. Physiological factors: If the environmental temperature is too low, it will cause the human body temperature to decrease, you can turn on the heater and other ways to increase the ambient temperature, or increase the clothing, eat more high-calorie food (such as meat, eggs, milk, etc.), appropriate exercise, and so on. 2. Pathological factors: If you suffer from hypothyroidism, due to the lack of thyroid hormone levels, resulting in low metabolism, there will be a decrease in body temperature, etc. Thyroid function tests can assist in the definitive diagnosis, and you need to take levothyroxine sodium tablets orally for treatment. If you have a low body temperature, you need to look for the cause, and if necessary, you need to consult a doctor in a timely manner to make a clear diagnosis and avoid delaying your condition.