There are many causes for<unk>  gastrointestinal (GI) hemorrhage. Causes are usually anatomically divided into their location in the<unk>  gastrointestinal tract, which could either be esophageal (for example esophageal varices) or gastric (an example is gastric ulcer) or duodenal e.g. duodenal ulcer.  Patients are also usually stratified into having either variceal or non-variceal sources of<unk>  GI hemorrhage, as the two have different treatment algorithms and prognosis.  Other causes could be from infectious diseases, medication side effects, trauma or malignancy and e.t.c.
Upper gastrointestinal bleeding causes
Gastrointestinal perforation causes
Gastrointestinal varices causes
Epistaxis causes
Pancreatitis causes
Gastritis causes
Acute pancreatitis causes
Mallory-Weiss syndrome causes