Table 3.

Causes of Lower Intestinal Bleeding

COMMONUNCOMMON
Infant• Anal fissure• Vascular lesions
• Milk protein intolerance• Hirschsprung enterocolitis
• Necrotizing enterocolitis• Meckel diverticulum
• Swallowed maternal blood• Intestinal duplication
• Intussusception
• Infectious enterocolitis
Older Child• Anal fissure• Inflammatory bowel disease (<4 years of age)
• Intussusception• Vascular malformations
• Infectious enterocolitis• Intestinal duplication
Salmonella• Henoch-Schönlein purpura
Shigella• Cecitis
Campylobacter• Infectious diarrhea
Escherichia coli O157—Cytomegalovirus colitis
Yersinia enterocolitica—Amebiasis
Clostridium difficile• Hemorrhoids
• Inflammatory bowel disease (>4 years of age)• Colonic or rectal varices
• Meckel diverticulum• Ulcer at surgical anastomosis
• Perianal streptococcal cellulitis• Solitary ulcer of the rectum
• Juvenile/inflammatory polyp• Nodular lymphoid hyperplasia
• Sexual abuse
• Rectal trauma