This book is a comprehensive guide to acute exacerbation of respiratory diseases. It examines the onset and severity of different diseases, helping clinicians diagnose and treat disorders appropriately. With contributions from international experts in the field, each chapter is dedicated to a different condition including Chronic Obstructive Pulmonary Disease (COPD), Asthma, Cystic Fibrosis, Sarcoidosis and Hypersensitivity Pneumonitis. Separate chapters cover acute exacerbation following lung transplantation, and the diagnosis and management of acute drug-induced lung disease.