The child’s old stomach pain is due to gastrointestinal dysfunction, enlarged mesenteric lymph nodes, parasitic infection, abdominal cold and other factors: 1. Children with gastrointestinal dysfunction are prone to indigestion, especially in the intake of food abnormal peristalsis of the intestines will lead to abdominal flatulence and discomfort, but also cause intestinal spasm, the child will have stomach pain. In addition to this, there will also be irregular stools, constipation and diarrhea alternately.2. Acute or chronic enlarged mesenteric lymph nodes and respiratory infections are directly related, patients are prone to nausea, vomiting, constipation and other manifestations, there will also be abdominal pain or fever and other symptoms, this disease is easily mistaken for acute appendicitis and should be treated in a timely manner.3. The parasite will not only absorb the nutrients inside the intestine after it enters the human intestine, but also lead to abdominal pain in children. 4. If you do not pay attention to the cold and warmth of the abdomen, the cool air invasion will lead to intestinal spasm and rapid peristalsis, so it will also cause stomach pain.