What Is Upper Airway Resistance Syndrome?
Sleep apnea tends to get the most attention when it comes to breathing-related sleep problems, but it isn't the only condition that can quietly disrupt rest. Upper airway resistance syndrome (UARS) is a related but distinct pattern — one that often goes undiagnosed because it doesn't fit the typical picture of a sleep disorder, and one that many people have never even heard of.
A Condition That Sits Between "Normal" and "Diagnosed"
Part of what makes UARS so easy to miss is that it exists in a kind of diagnostic gray area. It doesn't meet the specific criteria used to diagnose obstructive sleep apnea, so a standard sleep study can come back looking largely normal, even when someone is experiencing real, disruptive symptoms. This means a person can go through the process of getting evaluated, be told their results are unremarkable, and still be left without an explanation for their exhaustion.
This gap between "not sleep apnea" and "actually sleeping well" is where UARS tends to live. It's a real, physiologically distinct pattern, but because sleep medicine has historically focused most of its attention and diagnostic criteria on more severe airway obstruction, milder forms of resistance can slip through without being named or addressed.
How UARS Differs from Sleep Apnea
Sleep apnea involves the airway partially or fully closing, often accompanied by loud snoring or observable pauses in breathing. Diagnostic criteria for sleep apnea typically rely on a measure called the apnea-hypopnea index, which counts how many times breathing stops or significantly decreases per hour of sleep.
UARS is subtler: the airway narrows enough to increase resistance and effort during breathing, without fully closing and often without dropping oxygen levels enough to register on standard measures. This can still fragment sleep through repeated arousals, since the body still responds to the increased breathing effort by briefly rousing itself, even though it rarely produces the loud snoring associated with sleep apnea or shows up clearly on an apnea-hypopnea index score.
Why UARS Is Easy to Miss
Because it doesn't always show up on standard sleep apnea screenings and doesn't involve the more obvious symptoms doctors are trained to look for, UARS is frequently underdiagnosed — particularly in women, who are more likely to experience this subtler pattern than the classic presentation of obstructive sleep apnea.
Part of this comes down to how sleep studies are typically scored. Many standard assessments focus primarily on oxygen desaturation and clear breathing pauses, both of which can remain within normal limits in UARS even as sleep is being meaningfully disrupted by breathing effort and resulting arousals. Without a specialized assessment looking specifically for these subtler patterns, UARS can be present and significant without ever being flagged.
Common Symptoms
Persistent fatigue, unrefreshing sleep, brain fog, and daytime exhaustion are common, even when a person appears to sleep a full night without obvious disturbance. Beyond these general symptoms, a few more specific patterns are often associated with UARS:
Difficulty falling or staying asleep, sometimes alongside a tendency toward light or anxious sleep
Cold hands or feet, or other signs sometimes associated with disrupted autonomic regulation during sleep
A wired but exhausted feeling, particularly in the evening
Frequent waking to use the bathroom, even without drinking much before bed
Jaw tension or teeth grinding noticed upon waking
A body type or facial structure sometimes associated with a naturally narrower airway, though this varies significantly and isn't required for UARS to be present
Why This Matters, Even Without a Formal Diagnosis
Because UARS doesn't always result in a clear diagnostic label, it's easy to assume that without a diagnosis, there's nothing to address. But the underlying pattern, airway resistance disrupting sleep architecture, is real and can be meaningfully improved regardless of whether it's been formally named through a sleep study. Waiting for a specific diagnosis before addressing contributing factors like jaw position, tongue posture, or breathing habits isn't necessary, particularly when symptoms are already pointing toward an airway-related cause.
How Myofunctional Therapy Fits In
Myofunctional therapy addresses jaw position, tongue posture, and airway muscle tone — factors that contribute to the airway resistance seen in UARS. By improving these functions, therapy can help reduce the effort required to breathe during sleep, addressing the underlying mechanism rather than waiting for symptoms to become severe enough to meet formal diagnostic criteria for a more advanced condition.
In practice, this involves evaluating how the tongue rests during the day, since resting tongue posture tends to influence airway support during sleep. Therapy then typically includes exercises designed to strengthen and reposition the tongue, alongside guidance on nasal breathing and, where relevant, addressing jaw tension that may be contributing to airway narrowing. Because UARS involves resistance rather than full obstruction, many people find that consistent therapy can meaningfully reduce the breathing effort involved, allowing for deeper, more consolidated sleep over time.
Frequently Asked Questions
Is UARS a recognized medical diagnosis?
Yes, though it's less widely recognized than obstructive sleep apnea and isn't always included in standard sleep study reporting. Some sleep specialists screen for it specifically, particularly when symptoms are present but a standard sleep apnea diagnosis doesn't fit.
Can I have UARS if my sleep study came back normal?
It's possible. Many standard sleep studies aren't designed to detect the subtler breathing effort changes involved in UARS, particularly if oxygen levels and apnea-hypopnea counts fall within normal range.
Does UARS get worse over time if left unaddressed?
This can vary by individual, but airway resistance patterns don't tend to resolve on their own, and factors like jaw tension or weight changes can sometimes worsen symptoms over time if the underlying muscular and structural contributors aren't addressed.
Is UARS more common in women?
Research suggests women may be more likely to experience UARS-pattern symptoms compared to the classic presentation of obstructive sleep apnea, which may partly explain why airway-related fatigue is often under-recognized in women specifically.
Next Steps
If fatigue persists without an obvious diagnosis, UARS may be worth exploring.
See if Myofunctional Therapy is for you by scheduling a 30 minute Free Assessment.
