Children’s stomach pain may be caused by strenuous exercise, but also may be caused by biliary ascariasis, acute gastroenteritis and other diseases. 1. Strenuous exercise: when the human body in strenuous exercise, the pressure in the abdominal cavity increases, resulting in insufficient supply of blood and oxygen to the body, affecting the return of blood to the abdomen, and then there will be the symptom of stomach pain. 2. Biliary ascariasis: this disease is mainly caused by parasites in the intestinal tract, which can be induced by gastrointestinal dysfunction, hunger, pregnancy, poor hygiene and other factors, resulting in severe abdominal pain, chills, high fever, nausea, vomiting and other symptoms. 3. Acute gastroenteritis: This disease is mainly caused by rotavirus and other pathogens. It can be triggered by eating cold, overheated and other irritating foods, and then the child will experience abdominal pain, diarrhea, nausea, vomiting and other symptoms. In addition, children also need to consider the gastrointestinal cold, food poisoning, Crohn’s disease, chronic gastritis and other diseases. To summarize, there are many causes of tummy ache in children, so you need to go to the hospital in time to find out the exact cause.