Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Asthma is the common chronic inflammatory disease of the airways and is characterized by variable and recurring symptoms, reversible airflow obstruction, and bronchospasm. Its well-known symptoms include wheezing, coughing, chest tightness, and shortness of breath. Asthma is caused by a combination of genetic and environmental factors and its acute symptoms are usually treated with a short-acting salbutamol inhaler. Other symptoms can be prevented by avoiding triggers, such as allergensand irritants, and by inhaling corticosteroids...