When a four-year-old child has a sudden fever, we need to clarify the cause of the fever to see the symptoms accompanying the fever. If the fever is accompanied by sneezing, runny nose, mental discomfort and other symptoms, it is a symptom of a cold, which clinically belongs to the upper respiratory tract infection, and this situation can be symptomatic oral cold medicine and antipyretic drugs. If the fever is accompanied by symptoms such as nausea, vomiting and other gastrointestinal symptoms, it is considered to be acute gastroenteritis and the gastrointestinal type of the cold, and attention should be paid to the management of gastrointestinal function in addition to heat treatment. If the fever is accompanied by coughing and coughing, it is considered to be acute bronchitis. In this case, in addition to oral antipyretic medication, the child should be given medication for inflammatory airways, and if necessary, the child should be taken to the hospital for consultation. If your child has a fever with sudden hoarseness, consider acute laryngitis, which is usually a serious illness, and take your child to the hospital actively. These are the cases of sudden fever and the corresponding treatment.