Bronchitis patients often experience shortness of breath because the inflammation that causes the pulmonary airways to shrink restricts the amount of air entering and exiting the lungs. Therefore, the slightest physical exertion creates a deficit of oxygen in the body, causing breathlessness. More common in patients of chronic bronchitis, such shortness of breath can become problematic during more severe episodes. If it happens several times a day, seek professional medical help right away.

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