In this article, we report a case study of a 54-year old man who presented with massive gastrointestinal bleeding. Esophagogastroduodenoscopy and colonoscopy had been performed in another hospital, but the location of the bleeding could not be identified, and the patient was transferred to our hospital. An initial abdominal computed tomography scan showed only a large blood clot in the small bowel and colon, with duodenojejunal diverticulosis. Emergent angiography was performed due to persistent active bleeding. Active bleeding from the jejunum was found, and the patient received a double balloon enteroscopy, which disclosed active bleeding in one of the jejunal diverticula. Two hemoclips were applied to treat the Dieulafoy's lesion within the diverticulum. The patient had no bleeding during the month following treatment. Bleeding of the jejunal diverticulum is a rare clinical condition, and only a few cases have been reported in the literature with successful endoscopic treatment. A short review of the current methods of diagnosis and treatment of this rare disorder is provided.