Anti-fever patches are often applied to the parts of the body where large blood vessels pass through, such as the forehead, occiput, neck, armpits, groin, popliteal fossa and other parts of the body. Fever reducer is a kind of physical cooling method, its cooling mechanism is the hydrogel in the fever reducer, which can stimulate the central nervous system, and play a thermoregulatory role. Hydrogel can also make the local vasodilatation, heat dissipation increase, can be part of the body heat out of the body, and play a cooling effect. Anti-fever patches have the characteristics of easy application, small side effects and good safety, so they are commonly used as a physical cooling method. If the body temperature does not exceed 38.5 ℃, you can consider applying antipyretic patches for antipyretic treatment, if the body temperature exceeds 38.5 ℃, it is recommended to assist in the application of antipyretic drugs, or go to the hospital for further examination and treatment.