Editing Lower GI bleeding (section)

== '''Presentation''' ==

* >90% of melaena originates     from proximal to ligament of Treitz, although it can come from small bowel     or even colon
* Tends to be less severe and     intermittent compared to UGIB
* Right colon bleeding - often     dark red, mixed with stool, occasionally melaena
* Left colon - often bright red
* Haematochezia - bright red     blood, clots, or burgundy stools
* Abdominal pain, diarrhoea and     bleeding: colitis
* Minor LGIB:
** Anorectal lesions, IBD,      infectious colitis, AVM, polyps, malignancy
** Can generally be managed as      outpatients
* Major LGIB:
** Haemodynamic instability,      altered mental status, or need for transfusion
* Massive LGIB:
** MTP