Gastric ulcer, gastric ulcer symptoms, duodenal ulcer, digestive tract ulcer, duodenal ulcer symptoms. The C13 website provides a special feature on gastric ulcers for patients. Digestive tract ulcers are mainly chronic ulcers occurring in the stomach and duodenum. Gastric ulcer disease and duodenal ulcer disease have distinct differences in terms of etiology and pathogenesis. The average age of gastric ulcer patients is about 10 years older than that of duodenal bulb ulcer patients.