In adults, a temperature of 37 degrees Celsius measured in the armpit is not considered a fever and is a normal temperature. In adults, an axillary temperature between 36 degrees Celsius and 37.2 degrees Celsius is within the normal range. If the temperature is between 37.3 degrees Celsius and 38.0 degrees Celsius it is a low fever, between 38.1 degrees Celsius and 39.0 degrees Celsius it is a moderate fever, between 39.1 degrees Celsius and 41.0 degrees Celsius it is a high fever, and greater than 41 degrees Celsius it is a super high fever. Therefore, an adult underarm temperature of 37 degrees Celsius is not considered a fever and is a normal body temperature. It is possible for adult underarm temperature to fluctuate, for example, after strenuous exercise, the temperature may increase, and this fluctuation is normal. If the patient is not feeling well, he or she can be treated with physical cooling and drink plenty of water to promote metabolism in the body. Patients need to continue to monitor their body temperature, and if it continues to rise, they should go to the hospital in time to receive proper treatment under the guidance of a doctor.