A body temperature of 35 degrees is usually caused by physiological or pathological factors. 1. Physiological factors: If the patient has been in a low-temperature environment for a long time, or has eaten too much cold drinks and cold food, it will easily lead to a transient drop in body temperature, which will be relieved after a period of rest. It may also be an individual difference, if there is no discomfort, there is no need for treatment. 2. Pathological factors: if the patient’s body temperature often does not exceed 36 ℃, it may be a pathological phenomenon. For example, inflammation, infection, and endocrine and metabolic system diseases may cause a drop in body temperature. Therefore, if the patient’s body temperature is more than 35 degrees for a long time, exclude physiological factors, should go to the hospital in time to consult the doctor, clarify the cause of the disease, and target treatment.