Hot water bag cannot kill cancer cells. Hot water bag can only act on the surface of skin and cannot directly act on cancer cells, and there is no scientific basis for the claim that hot water bag can scald cancer cells to death. It is true that there exists the therapeutic method of tumor thermotherapy in tumor treatment, but it is not literally using hot water bag to apply hot compresses, but using physical energy to heat the whole body or local area of the human body. Normal tissues and tumor tissues have different temperature tolerance ability, according to this principle, tumor thermotherapy can make the temperature of tumor tissues rise to the effective treatment temperature without damaging normal tissues. If you really use hot water bag to scald the cancer cells, not only there is no therapeutic effect, but also there is a possibility of scalding the local skin. It is recommended to follow the doctor’s instructions to standardize the treatment and not to listen to the biased prescription.