Everyday life with CPAP
CPAP and Allergies: How to Breathe Easier
Allergies cause nasal congestion that can make CPAP uncomfortable and push you to breathe through your mouth. Heated humidification, a clean filter, saline spray and treating your allergies help. If your nose is often blocked, a full face mask may work better than nasal pillows.
Signs
- Stuffy or runny nose
- Sneezing at night
- Nasal pillows pushed out or leaking
- Mouth breathing and dry mouth
- Itchy, irritated nose
Common causes
- Allergic congestion
- ResMed says allergies create nasal congestion that can dry your mouth or block your airway, and that allergic reactions can disrupt CPAP.
- Not using humidification
- ResMed says humidification takes the work of warming air off your nose so it can clear allergens with less effort.
- Nasal pillows with swollen nasal tissue
- ResMed notes pillows masks can be harder to use with allergies, especially with a deviated septum.
- Dirty filter or equipment
- Dust and allergens can collect in filters and hoses.
Fixes to try, easiest first
Replace or clean your filter
Keep the air filter clean and change it as your manual directs. A hypoallergenic filter is an option on some machines.
Use heated humidification
Turn humidity on or up in allergy season, while avoiding rainout.
Try saline spray
Saline nasal spray can ease mild congestion, according to the AASM.
Treat your allergies with your clinician
Talk to your doctor about allergy medicines. The AASM suggests talking with your doctor about medicines for congestion, runny nose or sneezing if it affects your CPAP use.
Ask about a full face mask
ResMed says a full face mask covers mouth and nose so you still get air when your nose is congested.
Keep equipment clean
Wash mask, hose and chamber as your manual directs so allergens do not build up.
See your doctor if congestion keeps you from using CPAP, if allergies are not controlled, or if you get frequent sinus infections or nosebleeds. Your doctor may also discuss a different mask or type of PAP machine.
Supplies that can help
The air inlet filter keeps dust and lint out of the machine and your airway; it is a cheap part that needs regular replacement.
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 …
Distilled water is what most CPAP humidifier chambers are meant to be filled with, because it leaves little or no mineral scale behind.
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 allergies make my CPAP stop working?
Congestion can push you to breathe through your mouth, which causes leaks with nasal masks. Treating the congestion and using the right mask keeps therapy effective.
Should I use a hypoallergenic CPAP filter?
Some machines accept a hypoallergenic filter. ResMed's AirSense 11 guide notes its approved hypoallergenic filter causes a small reduction in pressure accuracy at high leaks, so use the one made for your machine.
Is a full face mask better for allergies?
It can be. ResMed says a full face mask lets you receive air whether your nose is congested or not.
Sources
Last reviewed October 11, 2026. How we research · Report an error