When you have bronchitis, the lining of the bronchial tubes, which are the airways that connect your windpipe (trachea) and your lungs, swells and becomes inflamed. This causes the bronchial tubes to produce excess mucus, which partially blocks the airway and causes the wet cough that is typical of bronchitis. In cases of the less common and more severe form known as chronic bronchitis, ongoing inflammation of the bronchial tubes can cause them to thicken and become scarred, leading to long-term damage.
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