AIM: To evaluate the aetiology, clinical outcome and factors related to mortality of acute upper gastrointestinal bleeding (AUGIB) in octogenarians.METHODS: We reviewed the records of all patients over 65 years old who were hospitalised with AUGIB in two hospitals from January 2006 to December of 2006. Patients were divided into two groups: Group A (65-80 years old) and Group B (>80 years old).RESULTS: Four hundred and sixteen patients over 65 years of age were hospitalized because of AUGIB. Group A included 269 patients and Group B147 patients. Co-morbidity was more common in octogenarians (P=0.04). The main cause of bleeding was peptic ulcer in both groups. Rebleeding and emergency surgery were uncommon in octogenarians and not different from those in younger patients. In-hospital complications were more common in octogenarians (P=0.05) and more patients died in the group of octogenarians compared to the younger age group (P=0.02). Inability to perform endoscopic examination (P=0.002), presence of high risk for rebleeding stigmata (P=0.004), urea on admission (P=0.036), rebleeding (P=0.004) and presence of severe co-morbidity (P