Asthma can be mild, moderate or severe. The air tubes that act as a conduit for air, become smaller as they swell and enlarge in response to the trigger. Muscles that maintain the integrity of your air tubes begin to tighten and work in concert with the swelling to constrict the airtubes. If this process is allowed to continue severe shortness of breath can decrease the oxygen level in your lungs. Attacks can be mild, moderate or severe.
Attacks can begin abruptly or can take days or weeks to develop.
However, the internal response of your air tubes has not stopped or reversed. The linings of the tubes contniue to swell and the mucous continues to be produced. What is very concerning is that this can occur despite the fact that you do not have any asthma symptoms. When the lining swells and the mucous increaes you may begin to find it more difficult to breathe. In some cases the delayed response can continue for hours days or weeks.