How is chronic bronchitis defined?

Chronic bronchitis is defined as a condition characterized by chronic inflammation of the airways, leading to the production of excessive mucus. This condition typically involves a persistent cough and sputum production that lasts for three months or more in at least two consecutive years. The inflammation and mucus related to chronic bronchitis can result from long-term exposure to irritants, such as tobacco smoke or environmental pollutants.

Mucus production is a significant aspect of chronic bronchitis, as it contributes to airway obstruction and difficulty in breathing. This excessive mucus production, alongside inflammation, distinguishes chronic bronchitis from other respiratory conditions. It is crucial to recognize that while other options mention inflammation or changes to lung structure, they do not encapsulate the long-term and excessive mucus production that is central to the description of chronic bronchitis.