This book provides comprehensive insights into the field of gastroenterology. It is a branch of medical science that deals with the study and prevention of diseases affecting the digestive system, that is, organs from mouth to anus and also the alimentary canal. Gastroenterology as a science includes various processes namely endoscopic retrograde cholangiancreatography (ERCP), endoscopy, liver biopsy, colonoscopy, etc. This book includes some of the vital pieces of work being conducted across the world, on various topics related to this field. It aims to shed light on some of the unexplored aspects of the subject and the recent researches in this area. The extensive content of this book provides the readers with a thorough understanding of gastroenterology.