How does asthma affect the lungs?
Asthma also causes swelling of the airways and mucus in the lungs, but it's a chronic -- usually lifelong -- condition rather than a temporary one caused by an infection. If you have asthma, your lung capacity may be lower because swelling and mucus physically limits the movement of air in your lungs. During an asthma attack the airways narrow, which may make you wheeze and can become dangerous.
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