If a 16-year-old child is a teenager, if he has a fever, it mainly depends on what the fever temperature is? If it is not over 38℃, physical cooling can be done. If it is over, you should use fever-reducing drugs to reduce the discomfort caused by fever. The cause of the fever should be further clarified, whether there is a pathogenic infection. It is best to do a routine blood test to see the percentage or count of white blood cells, neutrophils, and lymphocytes. In the case of fever remission, what causes the fever should be promptly identified to prevent some symptoms from manifesting themselves after the fever has receded and delaying the condition. Therefore, symptomatic fever-reducing treatment is usually sufficient, and then the cause of the fever should be identified and treated according to the cause.