In those who suffer from asthma, their airways become constricted and swollen, and they may also generate an increased amount of mucus. This can make it difficult to breathe and may cause coughing, a whistling sound (wheezing), and shortness of breath when you exhale. A few people with asthma only experience little discomfort from their condition. For other people, this can be a significant issue that severely limits their ability to participate in day-to-day activities and increases their risk of having a potentially fatal asthma attack.
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