The rate of pathologic lesions of PUD according to mild, moderate and severe degree respectively as followed: the rate of chronic gastritis was 100% (75.0%; 23.8%; 1.2%), active gastritis: 65.8% (62.0%; 28.5%; 9.5%), atrophic gastritis: 36.25% (66.7%; 25.3%; 8.0%), intestinal metaplasia: 25% (all lesions were mild).