Children with fever and vomiting do not want to eat, may be due to acute gastroenteritis, tonsillitis, encephalitis and other causes. 1. Acute gastroenteritis: children’s fever and vomiting do not want to eat due to children’s diet unclean, resulting in the gastrointestinal tract infected with bacteria or viruses, and the emergence of children’s fever and vomiting do not want to eat. 2. tonsillitis: tonsillitis caused by bacterial or viral infection of the tonsils of children, tonsil enlargement, resulting in fever and vomiting children do not want to eat. 3. encephalitis: pediatric encephalitis is a central nervous system infection with bacteria or viruses, leading to increased intracranial pressure, resulting in children with fever and vomiting do not want to eat. There are many other reasons why children do not want to eat with a fever and vomiting, the patient should consult a doctor in a timely manner, improve the relevant examination to clarify the cause of the disease, in the formal guidance of the doctor treatment.