As far as asthma goes, triggers for asthma are: allergies, family history (because there is a genetic influence) dust mites, pet dander, dust, cockroaches, pollen, mold, anything like that, pollutions and factory immetions can trigger some allergies. And often your patient will give you a history of GERD and exema (especially when they were a kid).
In asthma we have reversible narrowing of the bronchioles. When they narrow they swell, so it gets hyper responsive, the airway tends to remodel
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