1. Peptic ulcer : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
Normally, the lining of the stomach and small intestines are protected against the irritating acids produced in your stomach. But for a variety of different reasons, the protective process can stop working correctly, and the lining breaks down. Th...• Reviewer: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.