It is a misconception among the people that chemotherapy can prolong the survival of cancer patients. The reasons why chemotherapy causes patients to die are as follows: 1. chemotherapy drugs have lost control of the tumor, which is the fundamental reason; 2. patients did irregular treatment and did not follow the medical advice without checking blood on time, resulting in lower white blood cells combined with infection. This consequence is more serious and often leads to hemorrhage and high fever; 3. The consequence of doing chemotherapy for the patient’s condition, staging and physical state is not properly evaluated, which leads to the death of the patient who cannot tolerate chemotherapy.