Four-year-old children often have stomach pain, there are several possibilities: a. acute attacks of chronic appendicitis, children with low resistance may have recurrent attacks of appendicitis, patients can show fixed pressure pain in the right lower abdomen, chronic inflammation in acute attacks of patients will appear nausea, vomiting, abdominal pain, abdominal distension and other performance. The inflammation of the appendix can be clarified by perfecting appendiceal ultrasound and abdominal CT, and patients are recommended to have their appendix removed as soon as possible; second, mesenteric lymphadenitis, mesenteric lymphadenitis is mostly seen in patients with upper respiratory tract infections or lung infections, resulting in infection of the lymph nodes in the abdominal cavity due to decreased resistance, and abdominal pain is mostly manifested as fixed pressure pain around the umbilicus, and abdominal pain can be slowly relieved by strengthening anti-infective viral support therapy. The clinical manifestations of abdominal pain and abdominal distension are caused by the accumulation of intestinal contents due to the poor excretion of stool in children who have eaten too much, which can reduce the symptoms of abdominal distension and abdominal pain by giving low-pressure enemas and oral lactulose and other laxatives to promote the excretion of intestinal contents.