What are the symptoms of intussusception in children?

Written by Gong Hui
Pediatrics
Updated on May 12, 2025
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Intussusception in children is the most common cause of intestinal obstruction in infants and toddlers, often seen in children aged four to ten months. The main clinical manifestations of pediatric intussusception are paroxysmal abdominal pain. Infants typically exhibit episodes of crying and fussiness, with pale complexion, cyanosis, and frequent vomiting. Prolonged intussusception may result in the passage of bloody stools, resembling jam. In these cases, it is imperative to seek medical attention at a hospital. During a physical examination, doctors can feel an abdominal mass. An abdominal ultrasound can be performed, where a circular mass may be visible, confirming the diagnosis. After diagnosis, pediatric intussusception requires surgical treatment. If the intussusception has not persisted for long, an air enema can be performed. If the intussusception has lasted longer and the general condition is poor, surgical intervention may be needed under aggressive treatment.

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Written by Hu Qi Feng
Pediatrics
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Why does intussusception cause bloody stool?

Once intussusception occurs, only a small portion of the small intestine intussusceptions can reset themselves. Due to the continuous spasm of the sheathed intestinal tract, microcirculatory disorders occur in the intussuscepted segment. Initially, venous blood flow is obstructed, leading to tissue congestion and edema, venous varicosity, and mucosal cells secrete a large amount of mucus into the intestinal lumen, which mixes with blood and feces to form a jam-like jelly substance that is expelled. The intestinal wall becomes edematous, and the obstruction of venous return worsens, affecting the arteries, resulting in insufficient blood supply, and leading to systemic toxic symptoms. In severe cases, intestinal perforation and peritonitis can occur.

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Written by Hu Qi Feng
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Can infants with intussusception sleep?

Intussusception presents as abdominal pain, which occurs in sudden, severe, and periodic episodes. The child cries restlessly with a pale face, and the pain lasts several minutes or longer. The pain then subsides, and during this relief, the child falls asleep. The pain reoccurs every ten to twenty minutes. Continuous episodes occur until the intussusception is successfully reduced, after which the child calms down and falls asleep without further crying or vomiting.

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Written by Hu Qi Feng
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Can intussusception in children cause fever?

In the early stages of intussusception, the child generally remains in good condition, with normal body temperature and no symptoms of systemic poisoning. As the disease progresses and worsens, complications such as intestinal necrosis or peritonitis may develop, leading to deterioration of the overall condition. At this point, severe dehydration, high fever, lethargy, coma, and shock, among other symptoms of poisoning, can occur. Therefore, fever can indeed appear in the later stages of intussusception.

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Written by Yao Li Qin
Pediatrics
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How is intussusception diagnosed?

Intussusception is one of the common acute abdominal conditions in infants and young children. The primary clinical symptoms include abdominal pain, vomiting, and "jam-like" stools, with a mass often palpable in the abdomen. Initially, the overall condition of the child is generally fine, but in the later stages, symptoms such as dehydration, lethargy, coma, and shock can appear. Any healthy infant or young child who suddenly experiences episodic abdominal pain or periodic, regular bouts of crying, accompanied by vomiting, bloody stools, and a sausage-shaped mass in the abdomen, should be highly suspected of having intussusception. Once intussusception is confirmed, timely enema treatment should be administered to the child, and if the opportunity for an enema has passed, surgical treatment should be considered.

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Causes of intussusception in children

The etiology of intussusception is divided into primary and secondary types, with 95% being primary, which is common in infants and young children. In infants, the mesentery of the ileocecal region is not yet fully fixed and has a larger degree of mobility, which is a structural factor conducive to the occurrence of intussusception. Secondary cases account for about 5%, often secondary to Meckel's diverticulum, intestinal polyps, intestinal tumors, intestinal duplications, and abdominal purpura causing swelling and thickening of the intestinal wall, which can lead to intussusception. Certain factors may cause a change in the rhythmic movement of the intestines leading to disorder, thereby inducing intussusception, such as changes in diet, viral infections, and diarrhea.