This lecture is a commentary on diagnosis and management of acute alimentary bleeding, with special reference to the problems of the less common causes. It is based on the experience of treating over 4,000 cases admitted to the two gastroenterological wards at the Central Middlesex Hospital.Acute and chronic peptic ulcer accounted for about 80% of the admissions. The remainder included: hiatus hernia (2-3 %), portal hypertension (2-7%), carcinoma of the stomach (2 5 %), Mallory-Weiss syndrome (3 %), and about 40 different uncommon causes (5 2%), with a residue of acute bleeds of uncertain origin.