What is the primary reason asthma patients experience difficulty during expiration?

The primary reason asthma patients experience difficulty during expiration is due to inflammation of bronchial tubes. In asthma, the airways become inflamed and narrowed, which creates obstruction. This inflammation leads to increased resistance in the airways, making it challenging for a person to exhale air effectively.

During an asthmatic episode, the bronchial tubes may also undergo bronchoconstriction, where they tighten and reduce in diameter, further complicating the ability to push air out of the lungs. While excess mucus production and spasms can contribute to breathing difficulties, the inflammation is at the core of the pathophysiology of asthma, causing the primary issue during expiration.

High internal airway pressure is not a typical characteristic observed in asthma-related airway obstruction and does not directly explain the mechanism of breathing difficulties. Therefore, inflammation plays a crucial role in the difficulty experienced during expiration in asthma patients.