Book excerpt: Allergy is a disorder in which a person becomes hypersensitive to particular antigens (called Allergens) which provoke characteristic symptoms whenever they are subsequently encountered. This book spells out detailed information on the causes, prevention, and treatment of Asthma and all other respiratory disorders, in general in relation to allergies caused by various allergens. Various lines of treatment are suggested in a simple and understandable manner. Hopefully, this book will serve as a true guide to the readers to mitigate their asthmatic and allergic problems.