Lower gastrointestinal bleeding is bleeding from the rectum which starts distal to the ligament of treitz, a fold of peritoneum which holds up the duodenojejunal flexure.3

It comprises:

  • Haematochezia: bright red blood passed rectally
  • Malaena: black, tarry stool, suggesting altered blood which has been partially digested after a prolonged period passing through the GI tract.
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