Most common cause of upper GI bleeding?

Ans. a (Gastric ulcer). (Ref. Harrison's 16th ed., 235)UGIB (upper gastrointestinal bleeding) is defined as bleeding derived from a source proximal to the ligament of Treitz. Hematemesis and melena are the most common presentations of acute UGIB, and patients may present with both symptoms. Occasionally, a brisk UGIB manifests as hematochezia.Differential diagnoses for UGIB:# Peptic ulcer - 50% cases- Esophageal varices- Gastric varices# Mallory-Weiss tear- Esophagitis- Neoplasm# Hemorrhagic gastritis- Angiodysplasia- Hemobilia# Pancreatic pseudocyst- Pancreatic pseudoaneurysm- Aortoenteric fistula# Dieulafoy lesion (submucosal persistent caliber artery in stomach)