Definition Peptic Ulcer Disease is defined as an ulcer occurring in a region that touches gastric acid(胃酸) and pepsin (胃蛋白酶) and usually refers to gastric ulcer((胃溃疡 or duodenal ulcer((二指肠溃疡Definition Peptic Ulcer Disease is defined as an ulcer occurring in a region that touches gastric acid(胃酸) and pepsin(胃蛋白酶) and usually refers to gastric ulcer(胃溃疡) or duodenal ulcer(十二指肠溃疡)