If a patient has recurrent fever, the following factors are usually considered: First, infectious factors, such as bacterial, viral or fungal infections, if recurrent fever occurs to recheck blood culture and C-reactive protein, to test the cause and pathogen of the infection, and to choose the most symptomatic medication for this pathogen, in order to avoid recurrent fever. Second, we should consider whether there are other diseases that are not infections, such as connective tissue diseases that can also cause recurrent fever, such as dermatomyositis, herpes zoster, tuberculosis fever, etc. Third, whether the recurrent fever is related to endocrine metabolic diseases, such as hyperthyroidism and hyperadrenocorticism, when the clinical symptoms of recurrent fever can also occur. Fourth, find out if the recurrent fever is due to blood system and other infectious diseases, such as tumor, tuberculosis, AIDS, etc. Regardless of the above-mentioned causes of recurrent fever, the pathogenic bacteria should be identified and the most symptomatic anti-inflammatory and antibiotic drugs should be selected. Symptomatic antipyretic drugs, such as non-steroidal anti-inflammatory drugs ibuprofen, Advil, Enzyme, etc., can be applied to treat recurrent fever.