When would asthma be considered a chronic condition?

Asthma is an airway disease, sometimes reversible, where there is a narrowing of the airways and increased sensitivity of the lining of the airways to certain substances.  When the airways lose the ability to return to the person’s normal condition, the condition is considered chronic or non-reversible.  That is why it is so important to continue treatment for asthma even if you are not having outward symptoms.  Your airways may be changing (called re-modeling) even without obvious symptoms.