Physical cooling: Fever is a defense reaction of the body, and there is no urgency to reduce fever when the body temperature is <39℃ and not accompanied by other serious diseases. As long as attention is paid to observation, most of them will fall on their own. Only when the body temperature > 39 ℃ or with heart disease patients, pregnant women, infants and children with high fever should take emergency cooling measures can be considered to reduce fever. The most significant antipyretic is alcohol, warm water baths, if there is alcohol allergy or rash is best to use warm water. Ice bags or cold water bags can be used to cool the forehead, armpits, groin and other parts of the condition, while lowering the room temperature, the cooling effect is more ideal.