Asthma FAQs (cont.)
IN THIS ARTICLE
What Causes Asthma?
While there is no known specific cause of asthma, what all people with asthma have in common is chronic airway inflammation. Their airways are highly sensitive to various triggers. When their airways come into contact with a trigger, the airways become inflamed (they fill with mucus, swell, and narrow). Then muscles within the airways contract, causing even further narrowing of the airways. This makes breathing difficult and results in an asthma attack.
Triggers are different for different individuals. Common ones include the following:
Changes in weather can also trigger asthma attacks because of the irritants and allergens stirred up by wind and rain.
Asthma is on the rise in the United States and other developed countries. While the reasons are not clear, the following factors may contribute to the rise:
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