Snoring vs Sleep Apnoea: How to Tell the Difference

Here’s the reassuring headline first: snoring doesn’t necessarily mean you have sleep apnoea. As the Cleveland Clinic puts it, snoring is the most common sleep apnoea symptom — but plenty of people snore without the condition.^[1] The Merck Manual states the relationship precisely: “Only some patients who snore have OSA, but most patients who have OSA snore.”^[2]

So the question isn’t really “do I snore?” — it’s “is my snoring the ordinary kind, or is it the sound of a condition that deserves treatment?” This page explains how doctors and validated screening tools tell the two apart, so you know whether your next step is a simple lifestyle change or a conversation with your GP.

What obstructive sleep apnoea actually is

In ordinary snoring, relaxed tissue vibrates but air keeps flowing. In obstructive sleep apnoea, the tissue in the back of the throat collapses far enough that breathing actually stops during sleep.^[3] Each pause (an “apnoea”) or partial obstruction (a “hypopnoea”) disturbs sleep and stresses the body. OSA is defined as five or more of these events per hour of sleep, together with symptoms.^[2]

If you want the fuller picture of why airways narrow in the first place, see our guide to what causes snoring.

How common is sleep apnoea?

The classic figures come from the Wisconsin Sleep Cohort, published in the New England Journal of Medicine in 1993: an apnoea-hypopnoea index (AHI) of 5 or more was found in 24% of men and 9% of women, while the full syndrome (AHI ≥5 plus daytime sleepiness) affected 4% of men and 2% of women.^[4]

A 2013 update painted a picture of a growing problem. Moderate-to-severe sleep-disordered breathing (AHI ≥15) affected 10% of men aged 30–49, 17% of men aged 50–70, 3% of women aged 30–49 and 9% of women aged 50–70; around 26% of adults aged 30–70 had an AHI of at least 5. Prevalence had risen by between 14% and 55% compared with the late 1980s.^[5]

Globally, a 2019 analysis in The Lancet Respiratory Medicine estimated that more than 936 million people aged 30–69 have OSA worldwide — and that more than 85% of them are undiagnosed.^[6] That last figure is why pages like this one exist: the odds are that most people with sleep apnoea don’t know they have it.

Warning signs: the checklist

Snoring alone is not diagnostic either way. What matters is the company it keeps. Warning signs identified by the Mayo Clinic and the American Academy of Sleep Medicine include:^[7][8]

• Witnessed pauses in breathing during sleep (usually reported by a partner)
• Gasping or choking sounds during sleep
• Loud, frequent snoring with silent pauses
• Excessive daytime sleepiness — dozing off when you don’t intend to
• Poor concentration or memory problems
• Morning headaches
• Sore throat on waking
• Restless sleep
• High blood pressure

In children, the signs look different: poor attention, behaviour problems and slipping school performance can all point to sleep-disordered breathing.^[7] See our guide to snoring in children.

The Epworth Sleepiness Scale: measuring daytime sleepiness

Because daytime sleepiness is such a central symptom, doctors often quantify it with the Epworth Sleepiness Scale (ESS), developed by Dr Murray Johns at Epworth Hospital in Melbourne in 1990–91.^[9]

The scale asks you to rate, from 0 (would never doze) to 3 (high chance of dozing), how likely you are to fall asleep in eight everyday situations. The eight scores are added for a total between 0 and 24.^[10]

Any score of 11 or more indicates excessive daytime sleepiness and is worth discussing with a GP.^[10] Note what the ESS is and isn’t: it measures sleepiness, not sleep apnoea itself. A high score can have other causes, and some people with OSA score in the normal range.

STOP-Bang: the eight-question apnoea screen

The STOP-Bang questionnaire is a widely used screening tool for OSA risk. Each letter stands for one yes/no question:

• S — Snoring: Do you snore loudly?
• T — Tiredness: Are you often tired or sleepy during the day?
• O — Observed apnoea: Has anyone observed you stop breathing during sleep?
• P — Pressure: Do you have (or are you being treated for) high blood pressure?
• B — BMI: Is your body mass index in the higher range?
• A — Age: Are you over the age threshold?
• N — Neck: Is your neck circumference large?
• G — Gender: Are you male?

A score of 3 or more “yes” answers indicates elevated risk of OSA.^[11] The tool is deliberately tuned to catch cases rather than miss them: a 2022 meta-analysis found a sensitivity of 85% for any OSA, 88% for moderate-to-severe OSA and 90% for severe OSA, with a negative predictive value of 93.2% for severe disease.^[12]

You can download the official questionnaire from the American Academy of Sleep Medicine’s Sleep Education site: STOP-Bang questionnaire (PDF).^[13]

One caution, and it matters: high sensitivity means STOP-Bang flags a lot of people, including many who turn out not to have OSA (older men who snore will score 3 almost by default). A high score is a reason to get assessed, not a diagnosis — and a low score is not a guarantee.

How severity is measured: the AHI

If you go on to a sleep study, the result is expressed as your apnoea-hypopnoea index — the average number of breathing interruptions per hour of sleep. The NHS classifies severity as follows:^[14]

What the tests involve — from the GP conversation to home testing versus a full sleep-laboratory study — is covered in our guide to when to see a doctor.

Why women are underdiagnosed

The headline statistics above skew heavily male, and screening tools such as STOP-Bang even award a point for being male — which can make sleep apnoea look like a men’s condition. It isn’t. Measured prevalence in women rises markedly after menopause: in one large study, sleep apnoea affected 0.6% of premenopausal women but 2.7% of postmenopausal women not using hormone replacement therapy.^[15]

If you’re a woman who snores — or whose sleepiness, headaches or restless nights don’t fit the stereotypical picture — our dedicated guide to snoring in women covers the evidence in detail.

The bottom line

Snoring and sleep apnoea sit on a spectrum, and only an assessment can place you on it. If your snoring is plain snoring, that’s genuinely good news, and our complete guide to stopping snoring covers the remedies. If any of the red flags above ring true, take them seriously: sleep apnoea is common, mostly undiagnosed, and very treatable.