The most common cause of fever is what we usually call an upper respiratory tract infection. This period needs to be combined with blood tests, C-reactive protein, Mycoplasma pneumoniae and Chlamydia tests to see if it is a viral or bacterial infection, and then treatment and symptomatic management for the cause should be given. For obvious symptoms of respiratory tract infection, such as cough, throat, pain, fever, chills, generalized joint pain, etc., it is necessary to combine some clinical tests to identify the causative agent such as virus, bacteria, or mycoplasma, chlamydia, etc., and then give appropriate treatment. For viral infections, the first thing you can do is to take oral anti-viral solution, Shuanghuanglian oral solution, cold and flu granules, etc. If it is a bacterial infection, you can apply antibacterial agents such as penicillin or cephalosporin. If the patient’s main symptom is coughing, coughing sputum, or even chest pain and wheezing, then lung infection needs to be considered and a chest X-ray or CT examination should be performed, and sometimes a sputum culture plus drug sensitivity test is needed to help select the appropriate antimicrobial agent for anti-inflammatory treatment. For a body temperature of 38℃, you can drink a lot of water or physically lower the temperature. A body temperature >38.5℃ can be treated with oral antipyretic drugs such as acetaminophen tablets. Specific medication and dosage should be taken at a hospital interview and under the guidance of a doctor. In addition to common upper respiratory tract infections, there are also some lower respiratory tract infections (pneumonia, tuberculosis), urinary tract infections, gastrointestinal infections of the digestive system, rheumatic immune system diseases, hematological system diseases, etc. Symptoms of high fever can occur, so for fever, it is not only as simple as blindly going with antipyretic drugs, especially patients with prolonged fever should identify the cause of the fever and treat it systematically.