The causes of fever after chemotherapy for ovarian cancer are considered to be chemotherapy side effects, infectious fever, tumor fever and so on. 1. Ovarian cancer patients may cause fever after chemotherapy as a side effect of drugs, usually it is low-grade fever, and most of the fever symptoms will be relieved after patients are advised to drink more water. 2. After chemotherapy, patients are easy to cause side effects of blood system such as reduction of white blood cells, which makes patients prone to complications such as pneumonia, urinary tract infection, intestinal infection, etc. Clinical symptoms of fever will also appear, and it is usually necessary to give medicines to elevate white blood cells, control infections, and reduce fever, so as to make the body temperature return to normal. 3. After chemotherapy for ovarian cancer patients, the tumor lesions are not well controlled, thus causing tumor fever. Generally, it is necessary to change the treatment plan to control the ovarian cancer lesions, thus controlling the tumor fever.