Duodenal bleeding usually has black stools. If the amount of duodenal bleeding is very large and urgent, the stools may also show dark red changes, but basically they are shown as black stools. For duodenal bleeding, it is mostly considered to be caused by duodenal ulcer. However, because duodenal ulcers do not become cancerous, patients can rest assured. If bleeding duodenal ulcer is clearly present, patients must cooperate with the specialist to give regular acid suppression and hemostatic treatment. Patients with hemorrhagic shock also need blood transfusion, massive rehydration and volume expansion, and anti-shock treatment, which requires consultation with a specialist. In conclusion, most of the feces from bleeding duodenal ulcers are black or dark red with blood changes.