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Merck Manual Professional Version: Acute Bronchitis.
Although not curable, medications and lifestyle changes can control COPD symptoms and slow disease progression. Common symptoms include a chronic wet cough, shortness of breath, wheezing and chest tightness. Tobacco smoking and exposure to secondhand smoke accounts for most cases of COPD. These abnormalities obstruct airflow, particularly during expiration, which leads to trapping of so-called dead air and overinflation of the lungs. Over time, airway narrowing occurs along with increased mucus production and destruction of supporting tisue that diminishes lung elasticity and leads to loss of functioning air sacs.