Chronic bronchitis involves excessive mucus production due to the long-term irritation and swelling of the lungs' bronchial tubes, or the air passages through which air reaches the air sacs. Learn all about this condition, here.
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Chronic bronchitis involves excessive mucus production due to the long-term irritation and swelling of the lungs' bronchial tubes, or the air passages through which air reaches the air sacs. Learn all about this condition, here.