Bronchitis occurs when the bronchioles which is the lungs' air carrying tubes are infected and produce excessive mucus. There are two primary types of bronchitis: A cough that makes sputum lasts three months out of the year for at least two years is considered to have chronic bronchitis.The cough and irritation may also be brought on by a previous respiratory infection or illness, exposure to tobacco smoke, or other airborne aggravating substances.Chronic bronchitis, which can result in airflow obstruction, is referred to as chronic obstructive pulmonary disease (COPD).
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