Patients with duodenal ulcers, if vomiting blood occurs, are advised to slightly elevate their lower limbs, position their heads lower, and lie on their side. Because when patients with duodenal ulcers vomit blood, it indicates a relatively large amount of bleeding. Elevating the lower limbs slightly can effectively promote the return of blood from the lower limbs, ensuring the blood supply to vital organs, and lying on the side helps prevent the possibility of choking following vomiting. Once vomiting blood due to a duodenal ulcer occurs, an urgent gastroscopy is required, and hemostatic treatment should be carried out under gastroscopy.