Pediatric acute intussusception can occur throughout the year, mostly in the spring and fall when viruses and bacteria are active. It can occur from birth to school age, and is more common in infants and young children. It is common in obese and fit infants and children under 2 years of age, with sudden onset. Intussusception can cause abdominal colic, which is characterized by the sudden onset of significant irritability and discomfort in previously quiet children, and may include generalized tonicity. The legs are flexed toward the abdomen, the expression is painful, and the symptoms are sudden and abrupt; inexpressible infants, there are paroxysmal cries and noises, with normal performance or quiet sleep between attacks. As the disease progresses, indifference and drowsiness may occur between episodes of abdominal pain. Vomiting is common, starting with undigested food, followed by vomiting of bile-like material, which may be followed by generalized writhing and breath-holding. At the beginning of intussusception, the child passes a small amount of normal stool, and later blood appears in the stool, followed by dark red blood clots or jam-like stool due to intestinal ischemia and necrosis. Etiology: Most of the causes of acute intussusception in children are the consequences of intestinal dysfunction due to viral and bacterial infections, and a few are due to congenital intestinal malformations, tumors and other abdominal organic lesions. Physical examination of acute intussusception: at the onset of the disease, a mass of variable location can be palpated in the abdomen. The mass is usually curved or salami-shaped. Anal finger examination may reveal blood or blood-tinged mucus. The longer the duration of symptoms, the greater the amount of bleeding. Children with prolonged obstruction may develop dehydration and bacteremia, leading to tachycardia and fever, and occasionally hypovolemic or infectious shock. Untimely treatment can be fatal. Treatment is divided into conservative and surgical treatment. The majority of children who are seen in time are cured by conservative treatment with air enema repositioning. Some children with late presentation require surgical treatment to cure. Intussusception due to organic abdominal pathology also requires surgery to resolve the original pathology to cure.