Adults with fever for three days is still not good, repeated fever, may be cold, pneumonia, tuberculosis and other diseases caused. It is recommended to pay attention to daily care and give anti-infection, anti-tuberculosis and antipyretic drugs to treat the cause of the disease. 1. Cold: it may be caused by viral infection, and the recurrent fever may last for three or four days or longer. It is recommended to increase water intake to promote the metabolism of the virus, and to give cold and fever granules and Four Seasons Anti-Viral Oral Liquid, which can promote the recovery of the disease. Bacterial infection is not controlled, may cause recurrent fever, can be given azithromycin, amoxicillin, acetaminophen and other drugs. 2. Pneumonia: recurrent fever in patients with pneumonia is related to incorrect anti-infective treatment, resistance to antibiotics, drug fever, poor sputum drainage, etc. Anti-fever patches can be used, and cefixime, cefaclor, or intravenous input of acyclovir, ribavirin and benzylpenicillin can be given to treat the disease. If combined with pyothorax, pleural effusion, need to actively carry out thoracic drainage treatment. 3. Tuberculosis: patients with tuberculosis have irrational medication, drug resistance, and large scope of lesions, which may lead to recurrent fever. It is recommended to carry out CT examination, through infusion or oral ibuprofen, naproxen, which is conducive to the decrease of body temperature. Combined with rifampicin, ethambutol and other medications. To summarize, recurrent fever in adults is related to a variety of factors, it is recommended to go to the general internal medicine department of the hospital to find the cause first, and then give treatment for the cause.