If you’ve stuck with CPAP for weeks or months and still feel like it isn’t fixing your sleep — or it feels physically uncomfortable in a way that’s hard to describe, like a choking or gagging sensation — there may be an anatomical reason that has nothing to do with your discipline or your mask fit. Increasingly, researchers are looking at a specific, often-overlooked contributor: epiglottic collapse.
What is epiglottic collapse?
The epiglottis is the flap of tissue that sits at the base of the tongue and helps direct food into the esophagus rather than the airway. In some people with obstructive sleep apnea (OSA), it can also collapse or fold backward during sleep, contributing to airway obstruction. Estimates of how common this is vary widely — reported prevalence in the literature ranges from roughly 11% to over 70% of OSA patients evaluated — partly because it’s easy to miss. Awake airway exams generally can’t detect a problem that only shows up once someone is asleep, which is where a technique called drug-induced sleep endoscopy (DISE) comes in: it allows a specialist to observe the airway under sedation that mimics natural sleep, according to research summarized by the National Center for Biotechnology Information (NCBI) and the American Academy of Sleep Medicine (AASM).
Why CPAP can sometimes struggle with this specific issue
CPAP is, and remains, the front-line treatment for OSA, and it works very well for most people. But for the subset of patients whose obstruction is driven mainly by epiglottic collapse, some research suggests CPAP’s positive airway pressure can, in certain cases, push the epiglottis further backward, narrowing rather than opening the airway at that specific point — which may explain why some people describe CPAP as uncomfortable, poorly tolerated, or less effective than expected despite using it consistently. This doesn’t mean CPAP is the wrong treatment for everyone, or even for most people with epiglottic involvement — the relationship is described as variable and not fully predictable from person to person.
What this might mean if it sounds familiar
If you’ve been compliant with CPAP therapy — using it nightly, at the pressure your sleep study or titration recommended — and still feel unrested, or you experience a choking/gagging sensation with the mask on, it may be worth raising the possibility of epiglottic involvement with your sleep physician. Depending on the evaluation, options sometimes discussed in the literature include:
- Further evaluation with DISE to see what’s happening in your airway during sleep specifically.
- Alternative pressure delivery, such as BiPAP, which some patients tolerate differently than standard CPAP.
- Positional therapy, since airway anatomy and collapse patterns can change with sleep position.
- Oral appliance therapy, an option some sleep specialists consider for anatomically-driven OSA.
- Surgical evaluation in select, more severe cases, which would be a conversation with an ENT/sleep surgeon.
These are possibilities to discuss with a qualified sleep specialist — not a checklist to pursue on your own, since the right next step depends on your specific sleep study findings and airway anatomy.
The bottom line
Struggling with CPAP doesn’t automatically mean you’re doing something wrong. Airway anatomy varies a lot from person to person, and epiglottic collapse is one of several under-recognized reasons CPAP therapy can feel like it isn’t working as expected. If this resonates, it’s a reasonable, specific thing to bring up at your next sleep medicine appointment.
This article summarizes general findings from sleep medicine research and is not medical advice or a diagnosis. If you’re having ongoing trouble with CPAP therapy, talk to your sleep physician or an ENT familiar with sleep-disordered breathing about your specific situation.
— Gemifys
