Cancer cells are indeed afraid of heat, but not only cancer cells are afraid of heat, normal cells are also afraid of heat. Because the blood circulation in normal human tissues is rich, the blood vessels in cancer tumor tissues belong to many new blood vessels, with various distortions and micro thrombi, resulting in not very good blood flow, high resistance to blood flow, and many necrosis-like structures in the middle. Under the same heat, normal tissues can carry away the heat through blood flow, but tumor tissues have poor blood flow and heat dissipation, so often under the same temperature, normal tissues can survive while cancer cells may die. However, the temperature requirement is relatively high, often above 42℃ to really kill tumor cells, and also maintain for a certain period of time. 42℃ maintained for 1-2 hours will not be tolerated by normal human body, and will also lead to very serious toxic side effects. At present, the real application of heating for tumor treatment is still mainly in the form of thermal perfusion chemotherapy in the abdominal cavity.