Why does asthma often present with wheezing during exhalation?

💡 Explanation

Asthma exacerbations cause bronchoconstriction via mast cell activation and histamine release, leading to airway narrowing. Wheezing occurs because air is forced through these constricted bronchioles during exhalation. Therefore, bronchoconstriction is the main cause of wheezing, rather than alveolar tension, mucus plugging, or diaphragm fatigue.

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