Diffuse large B-cell lymphoma (DLBCL) is an aggressive malignancy that accounts for the largest proportion of non-Hodgkin lymphoma. Recurrent lymphoma is unusual to present as obscure massive small bowel bleeding, especially after long-standing remission. This case describes a 72-year-old man with a history of DLBCL presenting with gastrointestinal hemorrhage. Common causes of small bowel bleeding include underlying Crohn's disease, arteriovenous malformations, Dieulafoy's lesion, or

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... ed ulcers, and malignant neoplasms. Because massive small bowel bleeding is extremely rare, it is crucial to evaluate with a systematic approach using both radiographic and endoscopic imaging to determine the source of bleeding.