Gastrointestinal <unk>  refers to any<unk>  that starts in the gastrointestinal tract.<unk>  may come from any site along the GI tract, but is often divided into:
Upper<unk> : The upper GI tract includes the esophagus (the tube from the mouth to the stomach), stomach, and first part of the small intestine.
Lower<unk> : The lower GI tract includes much of the small intestine, large intestine or bowels, rectum, and anus.
Gastrointestinal bleeding
Internal bleeding
Lower gastrointestinal bleeding
Mucosal bleeding
Upper gastrointestinal bleeding
Burns
Gastrointestinal varices
Skin nodules