Primary benign neoplasms of the small bowel are unusual and less common than malignant neoplasms of the small bowel. Diagnostic difficulties and nonspecific symptoms are characteristic of this pathology. We describe a case of upper gastrointestinal hemorrhage with a duodenal neoplasm found incidentally under panendoscopy. After laparotomy, a histopathologic examination revealed a tubular adenoma that measured 5×2.5×1 cm. A review of the literature revealed that similar cases have rarely been reported. However, clinicians must have a high index of suspicion for unexplained gastrointestinal hemorrhage. Only early management can ensure excellent overall survival rate and prognosis for this condition.