Comfort and side effects
Stuffy Nose With CPAP: Causes and Fixes for Congestion
A stuffy nose on CPAP is usually caused by dry air irritating the lining of your nose, though colds and allergies play a part too. More humidity, saline spray and sometimes a full face mask are the main fixes, and your doctor can help if medicine is needed.
Signs
- Blocked nose at night or on waking
- Mouth breathing because the nose is blocked
- Snoring or leak alarms when the nose closes up
- Sinus pressure in the morning
- Trouble keeping a nasal or pillows mask on
Common causes
- Dry air
- Dry, unhumidified CPAP air irritates the lining of your nose, which can swell in response. The AASM recommends more humidity for congestion.
- Allergies
- ResMed notes that allergic reactions create nasal congestion and can disrupt CPAP. Pillows masks can be harder to use during allergy season, especially if you have a deviated septum.
- Colds and sinus infections
- A cold swells the nose for a few days to a couple of weeks and can push you into mouth breathing.
- Dirty equipment or filters
- Dust and allergens can build up in filters, tubing and the mask if they are not cleaned and replaced on schedule.
Fixes to try, easiest first
Use saline spray or rinse
Saline spray is the first step the AASM lists for mild congestion. Use it before bed. Some people also use a saline rinse earlier in the evening.
Clean or replace your filter and wash your gear
Check your machine filter and replace it if it looks gray or clogged. Wash your mask and tubing as your manual says, with mild soap and water.
Raise humidity a step
The AASM says increasing the humidity in your device may help congestion. Change one step at a time and watch for water in the tube.
Add heated tubing in a cold room
Heated tubing lets you run more humidity without rainout, which makes it easier to keep your nose moist all night.
Switch to a full face mask while congested
If your nose is blocked, a full face mask lets you breathe through your mouth and still get therapy. ResMed suggests a full face mask for people whose allergies make nose breathing hard. Some people keep one on hand for colds and allergy season.
Ask your doctor about allergy or congestion medicine with your clinician
The AASM suggests talking with your doctor about medicines for congestion, runny nose or sneezing if they affect your CPAP use. Ask before using decongestant sprays, since some should only be used for a few days.
Call your doctor if congestion lasts more than a couple of weeks, keeps you from using CPAP, comes with fever, facial pain or thick colored discharge, or if you have ear pressure or ear pain while using CPAP. Your sleep clinician can review whether a different mask or machine type would help.
Supplies that can help
Salt water spray that moistens and clears the nose, a simple aid for the congestion and dryness some people get on CPAP.
Tubing with a built-in heating wire that keeps humidified air warm all the way to the mask, which is the main fix for rainout (water droplets …
The air inlet filter keeps dust and lint out of the machine and your airway; it is a cheap part that needs regular replacement.
Distilled water is what most CPAP humidifier chambers are meant to be filled with, because it leaves little or no mineral scale behind.
A long, flexible brush sized to reach the full length of CPAP tubing so you can scrub the inside, not just soak it.
Plain, mild dish soap is the cleaning agent most CPAP makers and the FDA point to for masks, tubing and humidifier chambers.
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Mask types this applies to
Frequently asked questions
Can CPAP cause a stuffy nose?
Yes. Dry CPAP air can irritate the lining of your nose and make it swell. Heated humidification is the most common fix.
Should I stop CPAP when my nose is blocked?
Try not to skip therapy. Use saline, more humidity, or a full face mask so you can still breathe through your mouth. If you are too uncomfortable or have ear pain, call your provider.
Does a nasal pillows mask make congestion worse?
It can feel worse, because swollen nostrils can push the pillows out and cause leak. ResMed suggests asking about a nasal or full face mask during allergy season.
Sources
Last reviewed October 11, 2026. How we research · Report an error