The child’s stomach pain, vomiting and fever may be acute gastroenteritis, acute appendicitis and bacterial encephalitis. 1. Acute gastroenteritis: mainly due to infection with bacteria, viruses and other microorganisms, repeated stimulation of gastrointestinal mucosal tissues, easy to cause nausea, vomiting, diarrhea, abdominal pain, accompanied by fever and other conditions. 2. Acute appendicitis: mainly due to the obstruction of the appendix lumen, affecting the passage of stool, but also may be related to bacterial invasion, when the pathogenic bacteria repeatedly stimulate the human organism will appear fever, nausea, vomiting, accompanied by abdominal pain, mainly manifested in the right lower abdomen with fixed pressure pain. 3. Bacterial encephalitis: mainly due to the infection of bacterial brain tissue due to stimulation, the seriousness of the intracranial pressure will cause an increase in intracranial pressure, resulting in intracranial pressure edema, thus inducing nausea, vomiting and other symptoms, and will be accompanied by fever, fever, etc.; some children can be infected by the downstream infection, which causes abdominal pain. Children with stomach pain, vomiting and fever, in addition to the above factors, should also be considered as acute hepatitis and other diseases, it is recommended to consult a doctor as soon as possible, and analyze the cause of the disease through professional examination, and if necessary, cooperate with the doctor’s treatment.