Abstract: Causes of upper gastrointestinal bleeding (UGB)diagnosed withemergency endoscopy in 221 aged patients were analysed.Peptic ulceroccupied 45.2%,acute and chronic gastric mucosal damage 21.3%,neoplasma 20.8%,esophageal varices 6.8% and etc.Being different fromthe patients of other age groups,gastic ulcer accounted for most casesof this group and high location of the lesion and large ulcer occuredmore frequently.There were no typical history and symtoms of gastricdisorders in many aged patients.Stomach cancer complicating UCB wasmore concentrated in the age group of 60-70,and its incidence decreasedin patients over 70 years,while no cancer was found in cases over 80years.The percentage of esophageal varix was significantly less thanthat in other age groups.No complication of endoscopy in the 221patients occured.Therefore emergency endoscopy in aged patients withUGB is also applicable and safe.