flic.kr/p/a4RLsu

Asthma is a chronic lung condition that is characterized by difficulties of breathing.  People who suffer from asthma have air passages that are hyper-responsive or extra sensitive.  In the event of an asthma attack, the airways become irritated and react by constricting and narrowing, causing increased resistance to airflow, and obstruction of the flow of air through the air passages to and from the lungs. Read more . . .