Peptic ulcer disease is one of the most common chronic infections amongst humans. In spite of centuries of study, this ailment still bothers a lot of people, especially those in third world countries. It can sometimes lead to serious complications like cancer or even, death. This book consists of the current information on peptic ulcer disease, contributed by distinguished researchers from various countries around the world. It discusses topics like the cause of the disease, pathophysiology and molecular-cellular mechanisms.