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1. www.webmd.com › asthma › asthma-attackAsthma Attack: Causes, Early Warning Signs, and Treatment - WebMD

   www.webmd.com › asthma › asthma-attack

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   2021年10月31日 · An asthma attack is a sudden worsening of asthma symptoms caused by the tightening of muscles around your airways. This tightening is called a bronchospasm. During the asthma attack, the lining of...