This is because the nerve cells of the brain (nerve cells are more sensitive to temperature changes than other tissues) are affected or even damaged by the increase in body temperature, but of course these damages can be recovered in general, which is medically called “reversible”. “In the same way, tumor cells (tumor cells are more sensitive to temperature changes than other tissues) are affected or even damaged. By the same token, tumor cells (tumor cells are more sensitive to temperature changes than normal tissues) will also be damaged when the temperature rises, and if this damage cannot be recovered, that is, irreversible, and targets all tumors, it is inactivating the tumor and achieving the clinical treatment purpose.