Loosening the mucus
When mucus becomes thick and sticky — common in bronchiectasis, cystic fibrosis, and some COPD — it is hard to cough out and can trap bacteria. A mucolytic is a drug that thins mucus or makes it less sticky, so it clears more easily. Just as important are physical methods: staying well hydrated, breathing and huffing techniques, and chest physiotherapy that uses positioning, percussion, or special devices to shift secretions. The aim is to keep airways clear so infections take hold less often.
Pulmonary rehabilitation
One of the most effective treatments in chronic lung disease is not a drug at all. Pulmonary rehabilitation is a structured programme — usually several weeks of supervised exercise plus education and breathing training. For people with COPD (and many with fibrosis or other chronic conditions) it reliably improves exercise capacity, reduces breathlessness, and lifts quality of life. It works partly by reversing the downward spiral: breathlessness leads to inactivity, inactivity weakens muscles, weak muscles make any effort more breathless still.
Prevention, and the last resort
Preventing infections protects fragile lungs. The yearly influenza vaccine and the pneumococcal vaccine (against the bacterium that causes much pneumonia) are recommended for most people with chronic lung disease, because a single chest infection can trigger a serious flare. These vaccines do not prevent every infection, but they reduce how often and how severely they happen.
When a lung is failing despite every other treatment — for example end-stage fibrosis, severe COPD, or some inherited diseases — lung transplantation can offer a new chance. It is a major operation reserved for carefully selected people, and it trades one set of problems for another: lifelong medicines to prevent rejection, a higher infection risk, and close follow-up. For the right person at the right time, it can transform both how long and how well they live.