39 degrees 5 fever repeatedly for 4 days need to clarify the causes of persistent high fever, such as upper respiratory tract infection, pneumonia, acute pyelonephritis, deep abscess, etc., and for the cause of the disease to take drug treatment, but also antipyretic treatment. 1. Upper respiratory tract infection: it may be caused by viral or bacterial infection. If the fever is persistent, it is mostly secondary to bacterial infection, which needs to be treated with antibiotics, such as amoxicillin and cefadroxil. There may also be influenza virus infections, which need to be treated with antiviral drugs, such as oseltamivir. 2. Pneumonia: Persistent high fever is often seen in bacterial infections or mycoplasma infections. Bacterial infections can be treated with oral penicillin or cephalosporin antibiotics, such as amoxicillin and cephradine. Mycoplasma infections can use macrolide antibiotic drugs, such as roxithromycin, azithromycin. 3. Acute pyelonephritis: sensitive antibiotic drugs need to be selected, such as norfloxacin, levofloxacin, cefdinir and so on. 4. Deep abscess, such as liver abscess, is also a common cause. Need to clarify the lesion after puncture drainage. 39 degrees 5 recurrent fever also needs timely use of antipyretic drugs, such as ibuprofen, acetaminophen and so on. In addition, 39 degrees 5 recurrent fever for four days may be caused by other reasons, should be timely to the hospital, identify the cause of targeted treatment, the patient should not self-medication.