An elaborative account of information regarding respiratory diseases has been presented in this profound book. Medicine is a dynamic science. In this aspect, respiratory medicine is not an exception and has been developing during recent years. New researches broaden our knowledge and perspectives; provide better understanding of modern methods for diagnoses; and present genetic and underlying pathophysiology of diseases and new clinical experiences. Therefore, publications of new research works along with revisions of existing ones are required. This book presents factual aspects of pulmonary diseases. It presents the result of years of experience of expert clinicians in this field from various scientific centers. The book discusses respiratory diseases based on their epidemiology, pathology, diagnosis, treatment, and prognosis. It includes latest studies on the pathogenesis and molecular aspects of different diseases and is recommended for medical students, practitioners and pulmonologists.