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COMMON CHARACTERISTICS
Bronchitis is an inflammation of the bronchial tubes, or bronchi (the air passages that extend from the windpipe into the lungs). The inflammation may be caused by a virus, bacteria, smoking or the inhalation of chemical pollutants or dust. When the cells of the bronchial-lining tissue are irritated beyond a certain point, the tiny hairs (cilia) within them, which normally trap and eliminate pollutants, stop functioning. Consequently, the air passages become clogged by debris and irritation increases. In response, a heavy secretion of mucus develops, which causes the characteristic cough of bronchitis.
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