Children with a fever of 40 ℃ belongs to high fever, high fever state needs to be taken immediately to reduce fever treatment, such as medication to reduce temperature, physical cooling, and so on. If there are antipyretic drugs at home, the child’s mental state is good, and the hands and feet are not cold, peripheral circulation is still possible, immediately apply antipyretic drugs for treatment, such as acetaminophen or ibuprofen to choose a can. After the application of antipyretic drugs, due to the high fever state, the temperature is not easy to return to normal, you need to immediately cooperate with a variety of physical cooling methods alternately, in order to make the temperature return to normal, such as hot baths, with warm water wipe, paste antipyretic patches and other ways can be. If the child’s temperature does not return to normal after medication and physical cooling, you need to take the child to the hospital for further heat treatment to avoid persistent hyperthermia leading to poor peripheral circulation, which can lead to febrile convulsions and seizures.