35.7℃ is not a low fever in terms of axillary temperature, anal temperature or oral temperature, and it is a low body temperature. The normal range of armpit temperature is 36℃～37℃, the normal range of anal temperature is 36.5℃～37.5℃, and the normal range of oral temperature is 36.3℃～37.2℃, which will not appear the phenomenon that the body temperature is lower than 36℃, and if the body temperature is lower than the normal range, it belongs to the low body temperature. There are many reasons for low body temperature during measurement, which may be caused by measurement errors, such as measuring the thermometer clamped for a shorter period of time or not clamped. It can also be caused by prolonged exposure to cold temperatures, resulting in a drop in body temperature. It is recommended that when measuring low body temperature, several measurements should be taken, and the thermometer must be clamped and measured for 5 to 10 minutes, and attention should be paid to keeping warm and avoiding prolonged exposure to low temperatures. If the body temperature is still low and accompanied by uncomfortable symptoms, timely consultation is required.