A 54-year old woman was admitted to the hospital because of massive haematochezia. Emergency surgical exploration was performed and by a simple method the source of bleeding was localized and treated. We discuss one of the major problems in all GI-bleeding that lies in establishing the diagnosis. With localization in the small bowel the problem is even bigger because this part of the bowel isn't examined by conventional endoscopy. This case-story should be a reminder of the small bowel as a source of bleeding when conventional upper and lower endoscopy does not reveal the bleeding source.