![]() ![]() But the irritation from chronic bronchitis and/or smoking damages them. Small, hair-like structures on the inside of the bronchial tubes (called cilia) normally move mucus out of the airways. The buildup narrows the tube’s opening, making it hard to get air in and out of the lungs. In response, the tubes swell and mucus (phlegm or “snot”) builds up along the lining. ![]() COPD can progress gradually, making it increasingly difficult to breathe over time.Ĭhronic bronchitis irritates your bronchial tubes, which carry air to and from your lungs. A COPD diagnosis means you may have one of these lung-damaging diseases or symptoms of both. Chronic bronchitis and emphysema both can result in COPD. COPD Overview What is COPD (chronic obstructive pulmonary disease)?ĬOPD is an umbrella term for a range of progressive lung diseases.
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