Emphysema and Phlegm: Why Mucus Production Increases

Emphysema patients often cough up significant phlegm due to:

• Goblet cell hyperplasia: Chronic irritation increases mucus-secreting cells in airways.
• Impaired mucociliary clearance: Damaged cilia cannot effectively move mucus upward.
• Airway inflammation: Persistent inflammatory response stimulates secretion.
• Air trapping: Mucus pools in poorly ventilated regions.

Characteristics

• Often worse in morning (overnight accumulation).
• May be thick, sticky, yellow/green (suggests infection if purulent).
• Volume correlates with chronic bronchitis component (common overlap).

Management

• Hydration to thin secretions.
• Chest physiotherapy, flutter valve, active cycle of breathing.
• Mucolytics (e.g., N-acetylcysteine) in select cases.
• Antibiotics only for bacterial exacerbation (purulent sputum + increased dyspnea/volume).
• Smoking cessation: single most effective intervention to reduce production long-term.

Discuss persistent or changing phlegm with your provider—it may signal exacerbation or infection.