Adults with a temperature greater than or equal to 37.3°C are considered to have a fever. The normal body temperature of adults is 36.5~37.2℃, if the body temperature is greater than or equal to 37.3℃, it means fever, between 37.3~38.0℃ belongs to low fever, between 38.1~39.0℃ belongs to moderate fever, between 39.1~41℃ belongs to high fever, and more than 41℃ belongs to ultra-high fever. When the body temperature is lower than 38.5℃, you can treat it without taking antipyretic drugs, you can drink more water, rest more, soak a towel in cold water, wet it well with water, wring it out gently, and then apply it to your forehead or neck repeatedly with a cold towel. You can also use fever-reducing patches to reduce fever. If the temperature exceeds 38.5℃, you can take antipyretic medication to lower the temperature under doctor’s supervision, such as aspirin and ibuprofen. Taking medication needs to follow the doctor’s advice. Adults with a persistent temperature of more than 38.5℃ should go to the hospital for a doctor’s diagnosis and receive treatment in time to avoid adverse consequences.