CPAP Problems? Common Issues and How to Fix
Mask leaks, dry mouth, rainout, a noisy machine — the eight problems that come up most, and the practical fix for each.
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Sleep apnoea affects thousands of people across the UK, and Continuous Positive Airway Pressure (CPAP) therapy remains one of the most effective treatments. While CPAP machines can significantly improve sleep quality and overall health, many users experience problems during the first few weeks or after long-term use.
This guide explains the most common CPAP issues, their causes, and practical solutions to help you enjoy comfortable, uninterrupted therapy.
8 common CPAP problems, solved.
Tap each one for the cause and the fix.
1 CPAP Mask Leaks
A leaking mask is one of the most common complaints among CPAP users. Air escaping from the mask can reduce therapy effectiveness and create unwanted noise during the night.
- Incorrect mask size
- Loose or overly tight headgear
- Worn-out mask cushion
- Sleeping position causing mask movement
- Adjust your headgear for a secure but comfortable fit
- Replace mask cushions every 1–3 months
- Clean your mask daily to remove facial oils
- Consider trying a different mask style if leaks continue
2 Dry Nose or Mouth
Many CPAP users wake up with a dry nose, sore throat, or dry mouth.
The continuous airflow can dry out your airways, particularly during colder UK weather or when central heating is used.
- Use a heated humidifier
- Increase the humidity setting gradually
- Replace worn tubing if leaks are present
- If you breathe through your mouth, consider a full-face mask or a chin strap
3 Skin Irritation and Pressure Marks
Red marks or sore areas around the nose and face usually indicate excessive pressure or poor mask fit.
- Ensure your mask isn't overtightened
- Wash your face before bed
- Use CPAP mask liners for extra comfort
- Replace old cushions that have become stiff
4 Feeling Claustrophobic
Some new users feel anxious when wearing a CPAP mask.
- Wear your mask while reading or watching television before bedtime
- Start with short sessions and gradually increase usage
- Use your machine's Ramp feature to begin therapy at a lower pressure
Most users adapt within a few weeks.
5 Noisy CPAP Machine
Modern CPAP machines are generally very quiet. Unusual sounds often indicate a maintenance issue.
- Air filter condition
- Tubing for cracks or holes
- Proper water chamber installation
- Loose mask connections
If the noise continues, your machine may require servicing.
6 Condensation in the Hose (Rainout)
Condensation occurs when warm humidified air cools inside the tubing.
- Use a heated hose
- Keep your CPAP machine slightly lower than your bed
- Reduce the humidifier setting if necessary
- Insulate the tubing with a hose cover
7 Difficulty Exhaling
Some users feel they are breathing against strong air pressure. Many modern CPAP machines include pressure relief features that reduce pressure during exhalation. If you continue to struggle, speak with your sleep specialist about adjusting your prescribed settings.
8 Blocked Filters Affect Performance
Dirty air filters reduce airflow and may introduce dust into your therapy.
- Disposable filters: every month (or sooner if visibly dirty)
- Reusable filters: wash weekly and replace according to the manufacturer's guidance
Clean filters improve machine efficiency and air quality.
Proper maintenance extends the life of your equipment.
And helps ensure your therapy stays effective night after night.
- Clean your mask cushion
- Empty and rinse the humidifier chamber
- Wash tubing and water chamber with warm soapy water
- Clean reusable filters
- Allow all components to air dry completely
- Mask cushions
- Headgear
- Tubing
- Filters
- Water chamber (when worn or damaged)
Replacing consumable CPAP supplies on schedule helps maintain therapy performance and hygiene.
Even clean equipment wears out.
Normal wear reduces performance even if your equipment still looks clean.
| Accessory | Typical Replacement Interval |
|---|---|
| Mask cushions | Every 1–3 months |
| CPAP tubing | Every 6–12 months |
| Headgear | Every 6 months |
| Filters | Monthly (or as recommended) |
| Humidifier chamber | Every 6–12 months |
Replacing worn accessories can improve comfort, reduce leaks, and maintain effective therapy.
Quick answers to common questions.
Why is my CPAP mask leaking?
Can I use tap water in my humidifier?
How often should I clean my CPAP equipment?
How long does it take to get used to CPAP therapy?
Continue building your CPAP knowledge.
CPAP therapy is one of the most effective treatments for obstructive sleep apnoea, but like any medical equipment, it works best when properly maintained. Addressing common issues early, replacing worn accessories, and cleaning your equipment regularly can make therapy more comfortable and improve long-term results.
Whether you're new to CPAP or have been using it for years, keeping your equipment in excellent condition will help you enjoy better sleep, improved energy levels, and greater confidence in your treatment.
This guide is for general educational purposes only and is not a substitute for personalised medical advice. Pressure settings should only ever be adjusted by, or in consultation with, your prescribing clinician or sleep specialist.
If problems persist after trying the fixes in this guide, or you have concerns about your equipment or therapy, contact your sleep clinic or supplier for further support.