Gastrointestinal bleeding or gastrointestinal haemorrhage explains every form of hemorrhage (loss of blood) in the gastrointestinal tract, from the pharynx to the rectum. It has diverse causes, and a medical history, as well as physical examination, generally distinguishes between the main forms. The degree of bleeding ranges from undetectable to acute, massive and life-threatening bleeding. Initial emphasis is on resuscitation by infusion of intravenous fluids and blood transfusion. Treatment with proton pump inhibitors, octreotide, and antibiotics may be considered in some cases. Upper endoscopy or Colonoscopy is generally considered appropriate to identify the source of bleeding and carry out treatment.