pursed-lip breathing

Pursed-lip breathing is a way of breathing out slowly through narrowed lips, as if gently blowing through a straw or whistling, while breathing in normally through the nose. People with chronic obstructive lung disease often discover it on their own because it eases their breathlessness, and it is also taught formally in rehabilitation.

The trick works through back-pressure. In diseases like emphysema, the floppy small airways tend to collapse during exhalation, trapping air behind them. Breathing out against the slight resistance of pursed lips keeps a little extra pressure inside the airways, splinting them open long enough to let trapped air escape. Exhalation also slows and lengthens, which steadies the breathing rhythm and lets each breath empty more completely.

Over a few breaths this reduces the sense of breathlessness, lowers the breathing rate, and can nudge oxygen levels up slightly. It is simple, free and within the patient's own control, which is part of its value. Pursed-lip breathing manages a symptom and improves comfort and exercise tolerance; it does not cure the underlying disease, and it is most useful in obstructive conditions rather than as a remedy for every kind of breathlessness.