External fever is relative to internal fever. According to traditional Chinese medicine, external fever is a symptom of fever caused by external evil invading the body, which is often called “fever”, “cold fever” and “strong fever” in ancient times. In ancient times, it was often called “fever”, “cold fever”, “strong fever”, etc. The external evil that causes external fever is mainly wind, cold, summer heat, dampness, dryness, fire and so on. The invasion of external evil, the immune confrontation in the child’s body, the process of fighting between good and evil, the corresponding fever, cough, nasal congestion, runny nose and a series of symptoms belong to the category of external fever.