The causes of fever in cancer patients include infectious fever and cancer fever, which can effectively reduce body temperature and improve symptoms after active treatment, and the specific survival time cannot be judged. 1. Cancer patients with infectious diseases will cause fever under the stimulation of inflammatory factors, they can take antibiotics such as penicillin, roxithromycin, ceftriaxone and other drugs to control inflammation and reduce body temperature, and they can also take acetaminophen and ibuprofen and other medicines to symptomatically reduce fever. 2. Necrosis and absorption of tumor cells in cancer patients may also cause fever, which can be lowered by physical cooling or taking drugs such as ibuprofen to lower the temperature, and at the same time, active anti-tumor treatment. Due to the individual differences and the diversity of etiology, there is no absolute most effective drug, which needs to be used in accordance with the doctor’s prescription, the adverse reaction of the drug should consult the doctor in time, and the drug is forbidden to those who are allergic to the drug. After actively cooperating with professional doctors to receive treatment, can significantly reduce body temperature, improve the prognosis of the disease, prolong the survival time of patients.