Gastroesophageal reflux disease (GERD), or acid reflux disease is defined as chronic symptoms or mucosal damage produced by the abnormal reflux in the oesophagus. This is commonly due to transient or permanent changes in the barrier between the oesophagus and the stomach. This book focuses on varied topics relating to reflux disease including: the role of mucosal inflammation in reflux disease, pharmacologic treatment of GERD, paediatric gastroesophageal reflux disease, paraesophageal hernias and laparoscopic antireflux procedures, minimally invasive treatments of gastroesophageal reflux disease, obstructive sleep apnea and GERD, and others.