Sudden stomach pain in children may be related to acute gastroenteritis, intussusception, appendiceal perforation and other causes. 1. Acute gastroenteritis: If a child eats unclean food, it can cause gastrointestinal infection and inflammatory reaction, which can lead to sudden stomach pain. 2. Intussusception: abdominal pain due to pulling of the mesentery and strong contraction of the sheath of the intussusception, often sudden. 3. Perforated appendix: when appendix perforation occurs, the pain will spread to the right lower abdomen, or even the whole abdomen, and accompanied by muscle tension and rebound pain. Parents are advised to take their children to regular hospitals for consultation, to clarify the cause of the disease, and to carry out standardized treatment under the guidance of doctors to avoid delaying the disease.