Pulmonary medicine is the subspecialty of internal medicine that is involved with management and treatment of diseases affecting the respiratory system, which includes the thoracic cavity, lungs, chest wall and upper airways. It is aimed at treating a wide range of conditions and diseases, including asthma, severe acute respiratory syndrome (SARS), interstitial lung disease, lung cancer, acute respiratory distress syndrome (ARDS), chronic obstructive pulmonary disease (COPD), pulmonary hypertension, cystic fibrosis, lung transplant and pulmonary tuberculosis. Medicines taken orally or by inhalation is the most efficient and practical method of treating respiratory conditions. This book aims to shed light on some of the unexplored aspects of pulmonary medicine and the recent researches in this field. It covers in detail some existent theories and innovative concepts revolving around this domain. This book will prove to be immensely beneficial to students and researchers in this field.