Is Sleep Apnea Overdiagnosed? The Honest Answer (2026)

I get asked this one a lot, usually by someone who just read a headline questioning whether sleep apnea diagnoses have gotten out of hand. I'm not a doctor, and I won't tell you what your own test results mean. But I can walk you through what the actual debate is about, because it's more nuanced than either "it's all overblown" or "everyone with a snore needs a machine."

Is there a real overdiagnosis debate, or is this a myth?

It's real, and it's discussed in serious clinical circles, not just online forums. The core of the argument has a few parts:

• The AHI cutoff is a drawn line, not a hard biological threshold. Sleep apnea severity is measured using the apnea-hypopnea index (AHI) - the number of breathing pauses or shallow breaths per hour of sleep. The American Academy of Sleep Medicine's cutoffs define mild as 5 to 15 events per hour, moderate as 15 to 30, and severe as more than 30. Those numbers are useful for consistency, but a person just above 5 and a person just below it aren't meaningfully different physiologically.
• A high AHI does not always mean symptoms. According to SleepApnea.org, "although a higher AHI score tends to reflect more severe OSA, it doesn't always correspond with a person's actual symptoms. In some situations, a person can have a high AHI without having any symptoms at all."
• Home testing catches more mild, borderline cases. Home sleep tests are more accessible than an in-lab study, which is good for catching people who'd otherwise go untested. But it also means more mild-AHI cases get flagged, and the evidence that treating mild, minimally symptomatic OSA changes long-term outcomes is thinner than for moderate-to-severe, symptomatic cases.
• Some major trials didn't show the cardiovascular benefit once assumed. Worth understanding carefully rather than skimming past.

What did the CPAP heart-health trials actually find?

For years, it was assumed that treating sleep apnea with CPAP would reduce heart attacks and strokes, since untreated OSA is linked to cardiovascular risk. The SAVE trial, a large randomized study published in the New England Journal of Medicine, tested that assumption in patients with moderate-to-severe OSA and existing cardiovascular disease. Over an average follow-up of 3.7 years, the composite rate of cardiovascular death, heart attack, stroke, and related hospitalizations was 17.0% in the CPAP group versus 15.4% in the group that didn't use it - essentially no difference.

The editorial response to that trial didn't conclude "stop treating sleep apnea." It concluded something narrower: "prescribing CPAP with the sole purpose of reducing future cardiovascular events in asymptomatic patients with obstructive sleep apnea and established cardiovascular disease cannot be recommended." CPAP still has a clear job - reducing snoring, daytime sleepiness, and improving quality of life, which it does well - but "will this prevent a heart attack in someone who feels fine" turned out to be a harder question than doctors expected. That's the nuance that gets lost when a study result becomes a headline. For what a real, symptomatic diagnosis is actually like day to day, what it's like to live with obstructive sleep apnea covers that from a more personal angle.

So is sleep apnea also underdiagnosed? That seems contradictory.

It's not actually contradictory, and this is the part that gets left out when "overdiagnosed" turns into a headline. Both things are true at once, for different groups of people. According to the American Academy of Sleep Medicine, "obstructive sleep apnea affects nearly 30 million Americans, and an estimated 80% of cases remain undiagnosed."

Put those two facts side by side and the picture is less "the system tests too much" and more "the system tests the wrong people." Some people with clear symptoms - loud snoring witnessed by a partner, gasping awake, heavy daytime sleepiness - go years without ever being evaluated. Meanwhile, some people with mild, incidental findings on an easily accessible home test end up with a diagnosis and treatment plan that outpaces what the evidence supports for their situation. Overdiagnosis at the mild end and underdiagnosis at the moderate-to-severe end can both be real, and neither cancels the other out.

Untreated moderate-to-severe OSA, especially with daytime sleepiness, is linked to real risks: elevated blood pressure, higher accident risk from drowsy driving, and reduced quality of life. That's not a case anyone credible is trying to talk you out of. If you're wondering how a diagnosis affects everyday things like sleep position, is it okay for people with sleep apnea to sleep face down looks at that directly.

What symptoms actually warrant getting checked?

This is the part I don't want anyone walking away confused about. "The diagnostic net might be a little wide at the mild end" is not the same as "don't bother getting tested." Cleveland Clinic lists the core symptoms worth paying attention to, including "snoring," "breathing pauses while asleep (a sleeping partner may notice this)," "waking up feeling short of breath or like you're choking," and "daytime fatigue, sleepiness or exhaustion when waking up."

• Loud, habitual snoring - especially if a partner has noticed it getting worse over time.
• Witnessed pauses in breathing during sleep - usually someone else notices this, not you.
• Excessive daytime sleepiness - not just "tired after a bad night," but a pattern of struggling to stay alert despite what seems like enough time in bed.
• Waking up gasping or choking, morning headaches, or a dry mouth most mornings.

If any of that sounds familiar, the reasonable move is the same one it's always been: get evaluated. A test result isn't a verdict you're locked into - it's information your doctor uses, alongside how you actually feel, to figure out whether treatment makes sense for you.

What does a sensible approach actually look like?

Based on everything above, here's the balanced version, not the headline version:

• Get evaluated if you have symptoms. Snoring, witnessed pauses, and daytime sleepiness are worth a conversation with your doctor, full stop.
• Ask about your specific numbers, not just the label. "Mild," "moderate," and "severe" are useful shorthand, but your AHI, your symptoms, and your overall health together tell a fuller story than the category alone.
• Treat "should I use this treatment" as separate from "do I have this condition." A diagnosis doesn't mean one specific treatment is the only path - that's a conversation for your provider, not a decision from a diagnostic report alone.
• Don't use this debate as a reason to skip testing or stop treatment you've already started. If you're on CPAP or another therapy and it's helping you feel rested, that outcome matters regardless of what a population-level trial found for a different question entirely.

If you and your doctor land on exploring options beyond CPAP, how do you treat sleep apnea without CPAP walks through what those alternatives actually involve. And if you want the fuller picture of what sleep apnea is and how it's diagnosed in the first place, our sleep apnea guide is the place to start.

None of this is a reason to self-diagnose in either direction. Our Sleep Toolkit has practical, non-medical gear for better sleep generally, but it's not a substitute for an actual evaluation if you're having symptoms.

Frequently asked questions

Related reading:

• Sleep Apnea Demystified: A Comprehensive Guide
• How Do You Treat Sleep Apnea Without CPAP?
• What Is It Like to Live With Obstructive Sleep Apnea
• Is It Okay for People With Sleep Apnea to Sleep Face Down?
• Sleep Toolkit - practical gear for better sleep generally, not a substitute for medical evaluation

Sources & review: AHI severity cutoffs and their limitations from SleepApnea.org; undiagnosed prevalence estimate from the American Academy of Sleep Medicine; CPAP cardiovascular trial results and editorial commentary via TCTMD's coverage of the SAVE trial (originally published in the New England Journal of Medicine); symptom list from Cleveland Clinic. This is general information, not medical advice, and it isn't a substitute for an evaluation by your doctor or a sleep specialist. If you have symptoms of sleep apnea, or you're already on treatment and thinking about changing it, talk to your doctor before making any decisions.