Asthma is a well-known and common disease. Because you are familiar with asthma, do not assume you know all about it. This book is meant to be a guidebook to asthma. It analyzes the various complexities of asthma from what constitutes a diagnosis of asthma to what can be done to control an essentially incurable disease. This comprehensive book is meant to guide you through the issues, presenting them in a logical and understandable manner. My intention is that you will enjoy reading this book, gain useful knowledge about this complex disease, and return often to this book to revisit various issues.