Your nose feels either painfully dry and raw, or stuffed up and hard to breathe through, sometimes both on different nights. You might blow your nose in the morning and find it crusty, or wake up feeling congested even though you weren’t sick or dealing with allergies before you started CPAP. It’s the kind of thing that makes you second-guess whether you’re breathing well enough overnight, and it can make the mask itself feel less tolerable when your nose already feels irritated before you even put it on.

Why this happens

Continuous airflow through the nasal passages, especially without added moisture, can strip natural humidity from the nasal lining, leading to dryness, irritation, and swelling that then presents as congestion. Your body actually produces more mucus and the tissue swells in response to that irritation, so paradoxically the same airflow that dries your nose out can also be what makes it feel blocked. This tends to be worse in colder or drier climates, worse in winter with indoor heating, and worse if you already have some tendency toward rhinitis or nasal sensitivity, since CPAP airflow can aggravate an already reactive nasal lining, sometimes called CPAP-induced rhinitis.

Steps to troubleshoot

1. Turn on heated humidification if it isn’t already running, since this is the most consistently studied fix for CPAP-related nasal dryness and irritation
2. Add heated tubing if your setup supports it, which helps maintain consistent humidity delivery without water pooling in the tube
3. Keep your mask, tubing, and humidifier chamber clean, since built-up residue or bacteria can add to nasal irritation independent of dryness
4. If congestion is persistent, ask about a short-term saline rinse or nasal decongestant use, and check with your provider about safe duration since overuse of decongestant sprays can cause rebound congestion
5. If you have known allergies or chronic rhinitis, ask your provider about a nasal steroid spray, since these are more likely to help specifically in patients with an allergic or inflammatory nasal component
6. If nasal symptoms persist despite humidification and don’t seem allergy related, ask about an ENT evaluation, since structural issues like a deviated septum won’t respond to humidity or medication alone

Who to talk to

Your respiratory therapist can check and adjust your humidifier and heated tubing settings for your specific climate and season. Your DME can help troubleshoot equipment cleanliness or supply heated tubing if you don’t already have it. Your sleep doctor should be involved if nasal symptoms don’t improve with humidification, since they can evaluate whether allergies, chronic rhinitis, or a structural issue is contributing and refer you to an ENT specialist if needed.

Evidence

A randomized trial comparing dry CPAP, humidified CPAP, and CPAP with a nasal steroid found that adding a humidifier significantly reduced the frequency of nasal symptoms compared to the other two arms, though it’s worth being honest that this same study did not find a difference in overall CPAP adherence between groups.¹ For patients with known allergic rhinitis specifically, evidence has been more favorable toward nasal steroids: a systematic review and meta-analysis found nasal steroids improved CPAP adherence more in patients with allergic rhinitis than in those without it, which is why steroid sprays tend to be reserved for people with an identifiable allergic component rather than used broadly for everyone with CPAP-related nasal symptoms.²

References

1. Ryan S, Doherty LS, Nolan GM, McNicholas WT. Effects of heated humidification and topical steroids on compliance, nasal symptoms, and quality of life in patients with obstructive sleep apnea syndrome using nasal continuous positive airway pressure. J Clin Sleep Med. 2009;5(5):422-427.