Duodenal ulcer bleeding does not indicate cancerous changes. The duodenal area is relatively thin, so once a duodenal ulcer occurs, it is more likely to lead to complications such as ulcer bleeding and perforation. If vomiting blood occurs with a duodenal ulcer, it indicates that the patient with the duodenal ulcer has a bleeding complication. In terms of treatment, it is first necessary to complete an endoscopic examination, which can include endoscopic hemostasis; secondly, proton pump inhibitors should be used to suppress the secretion of stomach acid and increase the pH level in the stomach; additionally, treatments that protect the stomach lining, such as aluminum hydroxide and magnesium carbonate, should be used. (Medication should be taken under the guidance of a physician.)