1. Upper gastrointestinal bleeding is defined as bleeding from a source proximal to the ligament of Treitz and is 4 times more common than lower GI bleeding, occurring more frequently in males. 2. Upper GI bleeding can be variceal, from complications of liver disease, or non-variceal, associated with peptic ulcer disease. Common clinical features include abdominal pain, vomiting blood, black tarry stools, and signs of blood loss. 3. Initial management involves airway protection, IV access, fluid resuscitation, and blood transfusions. Endoscopy allows for diagnosis and treatment with clips, cautery, or injections while angiography with embolization is used for uncontrolled arterial bleeding.