A hissing, whistling, or blowing-in-your-eyes mask is uncomfortable for you and disruptive to your partner — and it usually means the mask isn't sealing the way it's designed to.
Why it happens
Leaks happen when the mask cushion isn't making full, even contact with your skin. Common causes include a worn-out cushion, the wrong mask size, facial hair breaking the seal, straps that are too loose (or overtightened, which distorts the cushion), or sleeping positions that shift the mask overnight.
How to fix it
- Replace the cushion on schedule. Silicone breaks down with washing and body oils — most manufacturers recommend replacing cushions every 1–3 months.
- Re-check your sizing. Sizing can vary by manufacturer even if you've always worn 'medium.' A fitting guide or DME consult helps.
- Loosen, don't tighten, to fix leaks. Over-tightening deforms the silicone and often makes leaks worse, not better.
- Try a different mask style. Side sleepers often do better with nasal pillows; back sleepers have more full-face options that seal well.
- Use a mask liner. Fabric liners absorb facial oils and can improve seal longevity between cushion replacements.
🎟️ Fresh cushions and liners across every major mask brand are in stock at TheCPAPBox — use code FRIEND5 to save on your restock.
Shop TheCPAPBox →See your doctor if: leaks continue despite a fresh cushion and correct sizing, or if you notice your machine's leak-rate data staying consistently high in your therapy app.
Related reading
How to Use Your CPAP →
Skin Irritation & Marks →