The inflammation causes the airways to be hyper-irritated and they respond by producing more mucus and going into spasm. Spasm means that the muscles around the airway tubes tighten and it is harder for air to move in and out. Therefore this inflammation needs to be treated, in addition to acute asthma attacks. This narrowing and extra mucus makes it difficult for air to get in and out. This is what makes them so overly sensitive.
More mucus is produced which makes the tubes more narrow.
The airway muscles around the airway tubes tighten up and squeeze shut. The material contained in this document was prepared to provide basic information. Questions concerning its application to your particular case should be directed to your physician.