38.1°C is considered a fever. The normal range of body temperature is 36.3 to 37.2°C, so 38.1°C is considered a fever. Fever is defined as an increase in body temperature beyond the normal range. Taking the oral temperature as a standard, 37.4℃~38℃ is low fever, 38.1℃~39℃ is moderate low fever, 39.1℃~41℃ is high fever, and 41℃ or more is super high fever. Clinical confirmation of whether the temperature is normal most of the use of axillary measurement, greater than 37.3 ℃ is fever. When fever should go to the hospital in time, to clarify the infectious fever or non-infectious fever, according to the different causes, give different treatment and symptomatic treatment.