Bronchitis is the inflammation of the airways (bronchous). If the inflammation persists for longer duration it is termed as chronic bronchitis.
The most common cause, why people develop persistent cough is 'Chronic Bronchitis'. It is a major disease having a chronic cough component. In the disease excessive mucus secretion is predominant. It is one of the obstructive airway diseases.
Infection of the bronchi is usually present. Bronchitis becomes chronic when continuous coughing results in irritation and the inflamed airways become thick and narrow. As the disease progresses, excessive mucus collects in the smaller airways and this can lead further to gasping, cyanosis etc.
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