"Gastrointestinal (GI) bleeding refers to haemorrhage into the lumen of the gastrointestinal tract."
"haematemesis: usually upper GI"
"GI bleeding is commonly clinically subdivided into whether it occurs in the upper (proximal) or lower (distal) GI tract:"
"GI bleeding is commonly clinically subdivided into whether it occurs in the upper (proximal) or lower (distal) GI tract:"
"upper GI bleeding: bleeding proximal to the ligament of Treitz, i.e. proximal to the duodenojejunal (DJ) junction"
"lower GI bleeding: bleeding distal to the ligament of Treitz, i.e. distal to the duodenojujenal junction"