Asthma is a disease of the airways that includes both inflammation and narrowing of the airway caused by smooth muscle tightening.
These changes lead to the typical symptoms of asthma, which include difficulty breathing, chest tightness, cough, and wheezing. Symptoms may vary from day to day and may be triggered by exposure to allergens (such as pollen, mold, dust, and animal dander), cold air, irritants (such as tobacco smoke), or certain medical conditions or medications (such as upper respiratory tract infections, allergies, or β-blockers).
Sobieraj DM, Baker WL. Medications for Asthma. JAMA. 2018;319(14):1520. doi:10.1001/jama.2018.3808
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