This book discusses the fundamentals as well as modern approaches of pulmonary medicine. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within this field. It is a specialized branch of medicine that deals with the diagnosis and treatment of diseases related to respiratory system and respiratory tract. Pulmonology also addresses the chronic breathing problems with the help of ventilator support. In this book, using case studies and examples, constant effort has been made to make the understanding of the difficult concepts as easy and informative as possible, for the readers. Pulmonologists, researches and students will benefit alike from this book.