When cancer patients have fever, it depends on how many degrees of fever and what causes the fever. If cancer patients have low fever, they need to consider the possibility of tumor fever, and the necrosis and absorption of tumor substance may lead to tumor fever, and the body temperature below 38.5 degrees can apply physical cooling and deal with the fever with Chinese medicine for clearing heat and detoxifying, such as oral Xinhuang tablets. If the body temperature is very high, higher than 38.5 degrees or even above 39 degrees, it is necessary to consider the possibility of infection. Besides applying antipyretic drugs, such as ibuprofen, to relieve the patient’s symptoms, anti-inflammatory and other treatments are also needed. Lung cancer may be accompanied by obstructive pneumonia and bacterial infection in the lungs, which need to be treated with sensitive antibiotics. Cancer patients themselves may have poor resistance and are prone to infection, so they need to clarify the lesion and cause and then further treatment.