If a lung cancer patient has a high fever that does not subside, the most important thing is to reduce the fever and apply non-steroidal anti-inflammatory and antipyretic drugs to make the patient’s body temperature fall. If persistent high fever does not subside, it is a great drain on the lung cancer patient itself, which can easily cause many serious consequences, and attention should be paid to applying antipyretic drugs to reduce fever. Physical cooling or even small doses of hormone can also be used to make the body temperature ease. After controlling the temperature, the cause of the fever should be clarified for further treatment. The most common cause of fever is infection, especially if it is associated with underlying diseases such as chronic obstructive pulmonary disease, in which case hematological examination is required, and anti-infective treatment with antimicrobial agents is required to control the temperature from recurring. In addition, there is also tumor necrotizing fever, which can be controlled and relieved with antipyretic drugs and effective treatment of the tumor.