Lowergastrointestinal bleeding, commonly abbreviated LGIB, is any form of gastrointestinal bleeding in the lowergastrointestinal tract. … This has been divided into middle gastrointestinal bleeding (from the ligament of Treitz to the ileocecal valve) and lowergastrointestinal bleeding which involves a bleed … Approximately 85% of lowergastrointestinal bleeding involves the colon, 10% are from bleeds that are actually upper gastrointestinal bleeds, and 3–5% involve the small intestines … 
Campylobacteriosis is an infection by the Campylobacter bacterium, most commonly C. jejuni. It is among the most common bacterial infections of humans, often a foodborne illness. It produces an inflammatory, sometimes bloody, diarrhea or dysentery syndrome, mostly including cramps, fever and pain.
Symptoms of this include "currant jelly" stools and a palpable lump in the lower abdomen. … Localised periumbilical pain may be experienced in the right lower quadrant (like appendicitis). … Hemorrhage may be caused by:
Ectopic gastric or pancreatic mucosa:
Where diverticulum contains embryonic remnants of mucosa of other tissue types.
Rupture into the fourth part of the duodenum will present as upper gastrointestinal bleeding. … The signs and symptoms of a ruptured AAA may include severe pain in the lower back, flank, abdomen or groin. … For best prognosis, the condition is best identified before it ruptures as elective repair carries a lower mortality rate.