HAEMORRHAGE definition: 1. a large flow of blood from a damaged blood vessel (= a tube carrying blood around the body): 2…. Learn more. Bleeding that won't stop? Understand what causes a haemorrhage , the signs to watch for, and how it’s treated. Get caring, expert support from HCG Hospital — know when to act fast. Hemorrhage, commonly known as bleeding, means the escape of circulating blood from blood vessels due to the rupture of blood vessels. Hemorrhage is bleeding from a damaged blood vessel, which can be internal or external, mild or severe. Learn about the causes, symptoms, types and treatment of hemorrhage, and when to see a doctor.