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Updated: 05/07/2017 08:30:00AM

Common asthma triggers and potential causes

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Asthma, a chronic lung disease that results in inflamed and narrowed air passages, affects millions of people around the world. The National Heart, Lung and Blood Institute notes that more than 25 million people in the United States have asthma. Asthma is also prevalent in Canada, where the Asthma Society of Canada says more than three million people currently have asthma.

When airways narrow and swell, they can produce extra mucus. Breathing becomes quite difficult when asthma is present. The Mayo Clinic says that asthma is just a minor nuisance for some people, while others may experience life-threatening attacks. Recognizing potential triggers and avoiding them can help control symptoms.

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