Fever in the hands and feet and vomiting in young children may be caused by acute upper respiratory tract infection, acute gastroenteritis, acute appendicitis and so on. 1. Acute upper respiratory tract infection: at this time, fever of the hands and feet and vomiting can occur. Vomiting is mainly due to the irritation of the gastrointestinal tract caused by fever and so on, resulting in gastrointestinal discomfort. 2. Acute gastroenteritis: mostly caused by viruses, bacteria and other microorganisms, usually manifested as fever, vomiting, diarrhea, abdominal pain and other symptoms, young children may also have fever in the hands and feet. 3. Acute appendicitis: Fever in the hands and feet can occur in young children with acute appendicitis, and the inflammation of the appendix stimulates the intestinal tract, triggering intestinal spasms and leading to vomiting. The fever and vomiting of the hands and feet of young children may be due to other reasons, it is recommended to consult a doctor in time to clarify the cause, and cooperate with the doctor if necessary.