Gastroenterology is a branch of medicine which focused on the study, diagnosis and treatment of disorders related to the digestive system. The digestive system encompasses organs such as the esophagus, stomach, small intestine, large intestine, liver, gallbladder and pancreas. The field of gastroenterology is involved in the diagnosis and management of a wide range of disorders, such as the gastroesophageal reflux disease (GERD), peptic ulcers, inflammatory bowel disease, irritable bowel syndrome (IBS), and gastrointestinal cancers. These disorders can be diagnosed by studying the medical history, physical examination, and various diagnostic procedures. These procedures may include endoscopy, imaging studies, blood tests, and stool analysis. The treatment of these disorders may include lifestyle modifications, dietary changes, medications, minimally invasive procedures, or surgery. This book explores all the important aspects of gastroenterology in the present day scenario. It will serve as a valuable source of reference for graduate and postgraduate students.