Asthma is a chronic airway obstructive condition that affects the bronchi. It is understood to be caused by a combination of environmental and genetic factors. Exposure to air pollution and allergens can trigger asthmatic episodes, while medications such as beta blockers and aspirin can also act as potential triggers. It is classified as per the frequency of symptoms, peak expiratory flow rate, and forced expiratory volume in one second. Asthma may also be atopic or non-atopic. Asthma occurs frequently with other health conditions such as rhinosinusitis, gastro-esophageal reflux disease, and obstructive sleep apnea. Psychological disorders including mood disorders and anxiety disorders are also common. This book contains some path-breaking studies in asthma. It provides comprehensive insights into this medical condition. For all readers who are interested in asthma, the case studies included in this book will serve as an excellent guide to develop a comprehensive understanding.