The symptoms of cancer fever are mainly manifested in the following aspects: a. Cancer fever is a fever symptom closely related to cancer, such as non-infectious fever, or fever symptom caused in the process of tumor occurrence and development. 2. Cancer fever appears as flaccid fever, irregular fever, and some may appear as retention fever, with body temperature usually at 37.5-38.5℃, some patients have fever mainly in the afternoon or at night, some patients have no obvious systemic symptoms, may be accompanied by chills, and the fever duration may be long or short, in which case antibiotic treatment is ineffective. Third, some simple cancer fever is mainly low fever, or self-conscious fever, body temperature is not high, other symptoms are sometimes not obvious, or only fever is the main symptom.