Intestinal Bleeding in Adolescents: Causes and Management

Primary Differential Diagnoses

The American Academy of Pediatrics recommends testing for Shiga toxin-producing organisms (STEC), Salmonella, Shigella, Campylobacter, and Yersinia in patients with bloody diarrhea, as these infections can cause intestinal bleeding in adolescents 3
Crohn's disease typically presents with focal erosion into intestinal vessels and can involve any segment of the GI tract, making it a critical consideration in adolescents with intestinal bleeding 1, 2
Ulcerative colitis causes bleeding from diffuse areas of mucosal ulceration, typically in patients with pancolitis, and is a common cause of intestinal bleeding in adolescents 1, 2
Peptic ulcer disease remains a significant cause of upper GI bleeding even in adolescents, particularly with NSAID use or Helicobacter pylori infection, and can present with melena 2, 4
Meckel's diverticulum is a congenital anomaly that can present with painless rectal bleeding in adolescents and should be considered if other causes are excluded 1, 2

The World Journal of Emergency Surgery recommends immediate assessment of hemodynamic stability followed by endoscopic evaluation in patients with intestinal bleeding, with a focus on identifying the source of bleeding 1, 2
Calculate the shock index (heart rate ÷ systolic blood pressure) immediately—a value >1 indicates hemodynamic instability and predicts poor outcomes, and check for orthostatic hypotension to assess blood loss 5, 6
Perform digital rectal examination to confirm blood presence and character (melena vs. hematochezia), and use this information to guide further diagnostic testing 5, 6
For hemodynamically unstable patients, perform CT angiography immediately to localize active bleeding, and consider catheter angiography with embolization within 60 minutes 5, 6
For hemodynamically stable patients, upper and lower GI endoscopy should be the initial diagnostic procedure, with EGD performed first if melena is present 2, 5, 6

Initiate IV fluid resuscitation immediately with goal of normalizing blood pressure and heart rate before endoscopic evaluation, and use restrictive transfusion thresholds to maintain hemoglobin >7 g/dL 5, 6, 7
Packed red blood cells should be transfused to maintain hemoglobin above 7 g/dL, with a threshold of 9 g/dL considered in patients with massive bleeding 1, 2
Avoid antidiarrheal agents (loperamide, kaolin-pectin, antimotility drugs) in patients with gastroenteritis, as these can worsen outcomes, and never give antibiotics empirically for bloody diarrhea before ruling out STEC 3
Monitor for HUS development in any patient with bloody diarrhea, especially if STEC is identified—watch for hemolytic anemia, thrombocytopenia, and acute kidney injury 3