Around 24 million Americans have asthma, a chronic lung disease that inflames and narrows the airways. People with asthma go through periods of wheezing, chest tightness, shortness of breath, and coughing. This can lead to emergencies during which a person can’t get enough oxygen.

People with asthma can learn to manage the condition, with the help of clinicians, various medications, and home environments that are clear of materials that could spark an asthma attack. Dust mites, pet dander, and cigarette smoke are among the many possible triggers.

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