Children with fever and vomiting are usually associated with upper respiratory tract infections, gastrointestinal disorders, neurological disorders and so on. 1. Upper respiratory tract infections: viral and bacterial infections are the main causes of upper respiratory tract infections, which usually lead to fever, vomiting, coughing and other symptoms. 2. Gastrointestinal diseases: fever and vomiting in children can also be caused by gastrointestinal diseases such as gastroenteritis and indigestion, usually accompanied by abdominal pain and diarrhea. 3. Neurological disorders: Neurological disorders such as meningitis can also lead to fever and vomiting in children, and some children may also experience convulsions and other symptoms. There may be other causes of fever and vomiting in children, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to determine the cause of the disease, and if necessary, to take active treatment.