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Hematochezia means passage of red blood per rectum. usually indicate bleeding from a source distal to the ligament of Treitz ,this can also occur from massive upper GI bleed.
It is due to the following causes
  • Bleeeding from lower Gastrointestinal  tract
  • Massive bleed from upper Gl transit time is reduced
Causes of LowerGI bleed 
This may be due to bleed from small intestine, colon, or anal canal.
Small intestine
  • Mainly vascular ectasia and tumors
  • Adenocarcinoma, lymphoma
  • Leiomyoma, Meckel's diverticulum
  • Benign polyp
  • Ischemic, Crohn's, NSAID - Erosion/ulcer
Colon/anal canal
  • Hemorrhoids, fissure in ano
  • Angiodysplasia
  • Polyposis, diverticulosis
  • IBD, Ischemic colitis
  • Ca colon, solitary rectal ulcer.