Upper gastrointestinal bleeding, also known as upper GI bleed, is a medical condition that requires immediate attention. It is a term used to describe bleeding that occurs in the upper part of the digestive system, which refers to the esophagus, stomach, and duodenum. This condition can present with symptoms such as vomiting blood, passing dark stools, abdominal pain, and weakness. There are several synonyms for upper GI bleeding, including upper GI hemorrhage, upper GI haemorrhage, upper GI tract bleeding, upper digestive tract bleeding, and upper GI bleeding syndrome. These terms represent the same medical condition that requires prompt diagnosis and treatment to prevent further complications.