Asthma
2014-07-06

       Asthma is a common chronic inflammatory disease of the airways characterized by variable and recurring symptoms such as reversible airflow obstruction and bronchospasm. Common symptoms include wheezing, coughing, chest tightness, and shortness of breath.

Asthma is thought to be caused by a combination of genetic and environmental factors. Its diagnosis is usually based on a pattern of symptoms, response to therapy over time, and spirometry. It is clinically classified according to the frequency of symptoms, forced expiratory volume in one second, and peak expiratory flow rate.