It is very common to experience fever and chills. Fever is caused by various reasons, such as viral or bacterial infections, which cause an increase in body temperature by shifting the body’s temperature setting point upward. In order to increase the body temperature, the heat production of the body increases and the heat dissipation decreases. In order to reduce heat dissipation, the capillaries on the surface of the skin are constricted, resulting in reduced blood flow. However, at the same time, it causes chills, and the skin surface often feels colder. If the temperature of fever is higher than 38.5 degrees, it is better to take antipyretic drugs, such as ibuprofen suspension and acetaminophen suspension. 2. If the temperature is below 38.5 degrees, it is better to use Chinese medicines to reduce fever, such as antelope powder, black bean curd and fever granules, cold and flu granules. The effect is better.