Bronchiectasis
Chronic infection and inflammation destroy the structural components of the bronchial wall, causing permanent, irreversible dilatation that pools mucus and perpetuates further infection, so the disease becomes a self-sustaining cycle of damage and re-infection rather than a single resolving illness.
First principles
Bronchiectasis is permanent structural dilatation, not a functional narrowing
Repeated or severe airway infection and inflammation (from causes as varied as prior severe pneumonia, tuberculosis, cystic fibrosis, immunodeficiency or impaired mucociliary clearance) damage the elastic and muscular components of the bronchial wall. Unlike the reversible bronchospasm of asthma or the fixed but non-dilating narrowing of COPD, the airway wall itself is destroyed and permanently stretched, so the bronchi dilate abnormally and lose their normal tapering structure. This structural change, once established, does not reverse. The anatomy of the airway has been permanently altered.
Educational content pending clinical review. Not medical advice.