Asthma is a predisposition to chronic inflammation of the lungs in which the airways (bronchi) are reversibly narrowed. During asthma attacks (exacerbations of asthma), the smooth muscle cells in the bronchi constrict, the airways become inflamed and swollen, and breathing becomes difficult. Asthma affects 7% of the population of the United States. Experts agree that asthma is increasing. Several national reports call it an epidemic. Nearly one in 10 American children now has asthma, a sharp rise in the statistics for this disease. This book includes the most up-to-date information on many different aspects of the disease. Through a series of case studies, it discusses the causes and symptoms, treatments, effects of asthma, and ongoing research.