Early symptoms can include periodic abdominal pain, nausea, vomiting (sometimes green in color from bile), pulling legs to the chest area, and intermittent moderate to severe cramping abdominal pain. Pain is intermittent—not because the<unk> temporarily resolves, but because the intussuscepted bowel segment transiently stops contracting. Later signs include rectal bleeding, often with "red currant jelly" stool (stool mixed with blood and mucus), and lethargy. Physical examination may reveal a "sausage-shaped" mass, felt upon palpating the abdomen. Children, or those unable to communicate symptoms verbally, may cry, draw their knees up to their chest, or experience dyspnea (difficult or painful breathing) with paroxysms of pain. In neonates it may present with bilious vomiting and blood stained stools Fever is not a symptom of<unk>  However,<unk> can cause a loop of bowel to become necrotic, secondary to ischemia due to compression to arterial blood supply. This leads to perforation and sepsis, which causes fever. In rare cases,<unk> may be a complication of Henoch-Schönlein purpura (HSP), an immune-mediated vasculitis disease in children. Such patients who develop<unk> often present with severe abdominal pain in addition to the classic signs and symptoms of HSP.
Intussusception 
Pyloric stenosis
Meckel's diverticulum
Vesicointestinal fistula
Enterocele
Meconium peritonitis
Rectal foreign body
Intestinal malrotation