Asthma Prevalence, Health Care Use, and Mortality: United States, 2005–2009 Lara J. Akinbami Author
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Asthma is a chronic respiratory disease characterized by episodes or attacks of impaired breathing. Symptoms are caused by inflammation and narrowing of small airways and may include shortness of breath, coughing, wheezing, and chest pain. Disease severity ranges from mild with occasional symptoms to severe with persistent symptoms that impact quality of life. However, even people with mild disease may suffer severe attacks. Common attack triggers include airway irritants (e.g., tobacco smoke and air pollution), allergens, respiratory infections, stress, and exercise


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