Intussusception is one of the common acute abdominal diseases in infants and young children. 3-year-old children with intussusception are mainly characterized by paroxysmal abdominal pain, vomiting, blood in the stool, and abdominal mass, in addition to the corresponding systemic manifestations. 1. Paroxysmal abdominal pain: intussusception is an intestinal obstruction caused by part of the intestinal tube and mesentery entering into the adjacent intestinal lumen, and the mesentery is pulled during intestinal peristalsis, which triggers abdominal pain, which is often manifested as facial pallor, depression, paroxysmal crying, and refusal of food in infants and children. 2. Vomiting: one of the early symptoms of intussusception. Vomiting is caused by intestinal obstruction that prevents the contents from being discharged or irritation of the intestines. 3. Blood in stool: Jam-like stool is one of the characteristic manifestations of intussusception. It occurs within 6~12 hours from the beginning of the disease and has clinical significance for early diagnosis. 4. Abdominal mass: in most cases, the mass can be touched in the right upper abdomen under the ribs with slight tenderness, which is sausage-like, smooth and not too soft, and slightly movable. 5. Systemic symptoms: children in the early general condition is still good, body temperature is normal, no systemic toxic symptoms. With the prolongation of the disease, aggravation of the condition, complication of intestinal necrosis or peritonitis, the systemic condition worsens, often with severe dehydration, high fever, drowsiness, coma and shock and other toxic symptoms. Parents found that 3-year-old children with the above symptoms, should promptly seek medical attention, under the guidance of the doctor for targeted treatment, so as not to miss the opportunity for treatment.