Common causes of fever include bacterial and viral infections, as well as other non-infectious diseases, such as: leukemia, rheumatic fever, malignant lymphoma, systemic lupus erythematosus, heat stroke, hyperthyroidism, etc. It is recommended to do routine examination to clarify the cause of fever. If the fever is simple, more than 38.5 ℃ and poor spirit, need to be combined with antipyretic treatment, such as: taking ibuprofen, indomethacin and other antipyretic anti-inflammatory drugs; at the same time, combined with physical hypothermia, such as: alcohol, warm water baths can be, and close monitoring of body temperature changes. Fever sweating will take away a lot of body fluids, causing dry mouth, sweating and so on, patients need to drink more water to promote the body metabolism.