If the fever is caused by common cold, the course of the disease is usually around 3-7 days, if the fever is caused by epidemic virus, the course of the disease is usually around 10 days, and the cycle can be shortened by medication. When you have fever, you need to drink more water, pay attention to rest, take vitamin C supplements, try to avoid going to crowded places to prevent cross-infection, and be alert to the phenomenon of dehydration and convulsions caused by high fever. It is important to take a light diet, eat less spicy, stimulating and greasy food, and avoid seafood such as fish and shrimp to avoid fueling fire and producing phlegm, causing symptoms of cough and aggravating the disease. If the temperature exceeds 38.5℃, you can use indomethacin suppositories in the anus, or oral antipyretic and analgesic drugs such as ibuprofen and acetaminophen, which can play a fast role in reducing fever, but indomethacin suppositories in the anus are not suitable for children under 14 years of age.