Changes

Asthma is a chronic medical condition where the bronchial tubes (in the lungs) become easily irritated.  This leads to constriction of the airways resulting in wheezing, coughing, difficulty breathing and production of thick mucus.   

'''Asthma''' is a chronic medical condition where the [[bronchial tubes]] (in the [[lungs]]) become easily irritated.  This leads to constriction of the airways resulting in wheezing, coughing, difficulty breathing and production of thick mucus.   

The cause of asthma is not yet known but environmental triggers, drugs, food allergies, exercise, infection and stress have all been implicated.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>

The cause of asthma is not yet known but environmental triggers, [[drugs]], [[allergies]], [[exercise]], [[infection]] and [[stress]] have all been implicated.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>

==References==

==References==