Four-year-old children often have stomach pain, there are several possibilities: First, acute attack of chronic appendicitis, small children with low resistance may be recurrent appendicitis, the patient can be manifested as a fixed pressure pain in the right lower abdomen, chronic inflammation of acute attack, the patient will appear nausea, vomiting, abdominal pain, abdominal distension and other manifestations. Through perfect appendix ultrasound and abdominal CT can clarify the inflammation of the appendix, it is recommended that the patient as soon as possible to perform appendectomy; Second, mesenteric lymphadenitis, mesenteric lymphadenitis is most common in patients with upper respiratory tract infections or lung infections, resistance to decline caused by intra-abdominal lymph node infections, abdominal pain manifested as a fixed pressure around the umbilicus, through the enhancement of the anti-infective viral supportive therapy, the patient’s abdominal pain can be slowly relieved! Third, pediatric intestinal obstruction, due to children eat too much stool defecation is not smooth, resulting in intestinal contents of the stagnation caused by abdominal pain, abdominal distension and other clinical manifestations, by giving low-pressure enema, oral lactulose and other laxatives to promote the excretion of intestinal contents, can reduce abdominal distension, abdominal pain symptoms of the child.