This is the first in a series of books dealing simultaneously with examination technique with detail pathophysiological principles, differential diagnosis and clinical interpretation, along with applied medicine about the common gastrointestinal diseases. Medical students or postgraduates will learn history taking, clinical examination and find relevant applied medical knowledge needed for bedside assessment of the patient. The hope is that the book will guide towards a correct diagnosis by history and examination, but also provide relevant differential diagnosis, localize the disease and identify the cause. This book intends to fill this gap and inspire the reader to gain confidence not only in the performance of the examination but also to answer most bedside queries and problems. It will serve as an indispensable resource for preparation of undergraduate and postgraduate viva and short and long case examination. This text is not a replacement for standard textbooks on the subject, but should serve as collection of facts and relevant details in the clinical assessment of the patient. This book is complemented by a second volume, in which numerous diagrams and figures have been included to stimulate understanding and learning along with a picture test and MCQ.