Fever can be caused after chemotherapy for the following possible reasons: 1. Adverse reactions caused by chemotherapy drugs, such as after bleomycin chemotherapy, after docetaxel, paclitaxel chemotherapy, and sometimes after gemcitabine chemotherapy some patients also have fever, so clinicians will give pretreatment, such as dexamethasone given to patients orally before docetaxel chemotherapy to prevent edema and possible allergic febrile reactions. 2. Consider, it may be fever due to the lack of granulocytes after chemotherapy with bone marrow suppression, causing potential possibility of infection. Therefore, during chemotherapy, the doctor will give the chemotherapy drugs that may cause fever the corresponding pretreatment, as well as after chemotherapy, the patient will be instructed to monitor the blood picture and give the corresponding treatment in time.