The differences between gastric ulcers and duodenal ulcers, in terms of symptoms, include that gastric ulcers often manifest as burning pain, or dull pain, distention pain, etc., usually postprandial pain, occasionally with nighttime pain. If it occurs at the pyloric canal, it lacks typical symptoms, with intense pain likely occurring after eating, and poor drug efficacy, prone to vomiting and pyloric obstruction, perforation, and bleeding. Gastric ulcers have a minor possibility of becoming cancerous. Duodenal ulcer pain is mostly located in the upper abdomen, characterized by hunger pain and midnight pain. Abdominal pain generally eases after eating or taking some antacid medications. For ulcers occurring behind the bulb, nighttime pain and a radiating pain in the back are more common. However, the effectiveness of medication is relatively poor, and it is prone to bleeding. Duodenal ulcers are more likely to lead to perforation and pyloric obstruction, but generally do not become cancerous.