Gastroesophageal reflux disease (GERD) is one of the most common gastrointestinal disorders in the Western world. In recent years, there have been many developments in the field of GERD. At least, all these developments have helped to find new diagnostic procedures and different treatment concepts. As well known, GERD affects patients quality of life and leads to a significant economic burden on society. Therefore, all further investigations should primary aim in an improvement of patients daily life. The challenge of this book is to critically evaluate the currently available literature and to present for all you who are interested in the field of GERD the basic.