Most people picture sleep apnea as a heavy-set middle-aged man who snores like a freight train and dozes off in meetings. That picture fits many men. It misses many women.

Obstructive sleep apnea (OSA) affects up to 49% of men and 23% of women. Yet up to 75% of women with OSA remain undiagnosed. One major reason is that women often have different symptoms, and those symptoms rarely make anyone think “sleep apnea.”

This article explains how OSA shows up differently in men and women, why it happens, and what to do if the symptoms sound familiar.

What Is Obstructive Sleep Apnea?

OSA happens when the airway in the throat narrows or closes during sleep. Breathing becomes shallow or stops for 10 seconds or longer. The brain senses the problem and briefly wakes you up to restart breathing. Most people never remember these wake-ups.

Doctors measure OSA with the apnea-hypopnea index (AHI). This is the number of breathing pauses or shallow breaths per hour of sleep.

• 5 to 14 per hour: mild
• 15 to 29 per hour: moderate
• 30 or more per hour: severe

Untreated OSA raises the risk of high blood pressure, heart disease, diabetes, depression, and car crashes. Getting the diagnosis right matters for both sexes.

Why OSA Looks Different in Women

The same disease behaves differently depending on anatomy, hormones, and how the brain responds to breathing problems.

Women wake up more easily. Women tend to have a lower “arousal threshold.” Their brain wakes them up sooner when breathing gets difficult. This prevents long, dramatic breathing pauses. It also breaks sleep into small pieces. The result feels like insomnia and exhaustion rather than loud snoring and gasping.

Women’s events cluster in dream sleep. In women, breathing problems tend to concentrate in REM sleep, the dreaming stage that happens mostly in the second half of the night. A population study from Germany published in 2026 confirmed this pattern. Men’s breathing events spread more evenly across the night. Because REM is a small share of total sleep, a woman’s overall AHI can look mild even when her sleep is badly disrupted.

Men have more oxygen drops and more trouble on their backs. A study of more than 1,100 patients found men had higher overall AHI, more frequent drops in blood oxygen, and much worse breathing when sleeping on their backs. Nearly half of the men (46.9%) had severe OSA, compared with about a third of women (35.2%).

Hormones protect women, until they don’t. Estrogen and progesterone help keep breathing stable and the airway open. When these hormones fall at menopause, OSA risk rises sharply. The rate of OSA in women roughly doubles after menopause and becomes similar to that of men. Women who go through menopause early, either naturally or after surgical removal of both ovaries, are at especially high risk.

Symptoms Side by Side

The table below pulls together findings from large patient registries in Turkey (7,130 patients), Spain (2,022 patients), and Italy (2,663 patients), along with recent expert reviews.

Feature	Men	Women
Loud snoring	Very common and often the main complaint	Present but more often soft, unnoticed, or not reported
Breathing pauses seen by a bed partner	Common	About half as likely to be reported
Daytime sleepiness	Classic symptom	Similar rates in some studies, but often described as tiredness
Fatigue and low energy	Less prominent	About 2.7 times more likely
Insomnia (trouble falling or staying asleep)	Less common	About 2 times more likely
Morning headaches	Less common	About 3 times more likely
Depression	Less common	About 4 times more likely
Anxiety	Less common	About 3 times more likely
Memory and concentration problems	Present	About 1.8 times more likely
Usual age at diagnosis	Younger (average about 50 in the Turkish registry)	Older (average about 57), often after menopause
What the sleep test shows	Higher AHI, more oxygen drops, worse on the back	Lower AHI, events concentrated in REM sleep, more broken sleep
Common linked conditions	High blood pressure, heart disease	High blood pressure, diabetes, asthma, thyroid disease, acid reflux, polycystic ovary syndrome (PCOS)

The pattern is clear. Men tend to show the “noisy” signs that bed partners notice. Women tend to show “quiet” signs that look like stress, poor sleep, menopause, or depression.

One more finding stands out. In the Turkish registry, women had milder OSA on testing but carried more symptoms and more related health conditions than men. A lower number on the sleep report does not mean a lighter burden.

Life Stages That Change the Picture for Women

Menstrual cycle. Symptoms can shift across the menstrual cycle as hormone levels rise and fall.

PCOS. Women with polycystic ovary syndrome have a higher risk of OSA, even at a younger age. OSA in premenopausal women is strongly linked to depression and metabolic problems.

Pregnancy. Weight gain, fluid shifts, and nasal congestion can bring on snoring and OSA, especially in the third trimester. OSA in pregnancy is linked to high blood pressure, preeclampsia, and gestational diabetes. Pregnant women with OSA often report insomnia and poor sleep quality rather than heavy daytime sleepiness.

Menopause. This is the biggest turning point. Hot flashes, night sweats, and poor sleep are often blamed on menopause alone. In some women, OSA is part of the problem and goes unrecognized.

Why Women Get Missed

Most screening questionnaires were built around symptoms common in men, such as loud snoring, witnessed pauses, and falling asleep during the day.

A study of 1,978 women tested how well common questionnaires predicted moderate to severe OSA. The results were weak.

• The Epworth Sleepiness Scale performed about as well as a coin flip.
• The Berlin Questionnaire was only slightly better.
• The STOP-Bang questionnaire did best, but still picked up only about 65% of women who had moderate to severe OSA.

Women with fatigue, insomnia, headaches, or low mood are also more likely to be treated for depression, anxiety, or menopause first. The breathing problem underneath can go untested for years.

When Insomnia and Sleep Apnea Occur Together

Many women have both insomnia and OSA at the same time. Sleep specialists call this COMISA (comorbid insomnia and sleep apnea). It is more common in women than in men.

This combination matters for heart health. A 2025 study of nearly 938,000 US veterans found that women with both conditions had about 2.2 times the risk of developing high blood pressure and about 3.4 times the risk of heart disease compared with women who had neither. Men showed a similar pattern.

If you have insomnia that has not improved with standard treatment, ask whether sleep apnea has been ruled out.

What to Do If This Sounds Like You

For women:

• If you have ongoing fatigue, insomnia, morning headaches, or low mood, and you snore even a little, ask your doctor about OSA.
• If your sleep changed around menopause, mention it. Do not assume hormones are the only cause.
• If you are pregnant and start snoring, or develop high blood pressure or gestational diabetes, tell your obstetrician about your sleep.
• If you have PCOS, thyroid disease, or treatment-resistant high blood pressure, ask whether a sleep evaluation makes sense.
• If a home sleep test comes back normal or mild but your symptoms persist, ask whether an in-lab sleep study is needed. Home tests can underestimate OSA that occurs mostly during REM sleep.

For men:

• Loud snoring plus breathing pauses seen by a partner deserves prompt testing.
• Drowsy driving is a warning sign. Get evaluated and avoid driving when sleepy.
• Notice whether snoring is worse on your back. Share this with your doctor.

A questionnaire alone cannot rule out OSA. A sleep study is the only way to know.

Treatment Works for Both Sexes

Once diagnosed, OSA is very treatable. Options include CPAP (a mask that gently pushes air to keep the airway open), oral appliances that move the jaw forward, positional therapy, weight management, and in some cases surgery or nerve stimulation devices.

Women may need lower CPAP pressures than men with similar severity and may be more bothered by mask side effects. A good mask fit and follow-up visits make a real difference. Oral appliances may work especially well for women with mild OSA.

About the Evidence

Differences in symptoms between men and women are studied by observing large groups of patients, not through randomized controlled trials. The evidence in this article comes from large national registries, a population-based study, a very large veterans cohort, and recent expert reviews published in respected journals such as Chest, Sleep Medicine, and the Journal of the American Heart Association. Findings are consistent across countries, which strengthens confidence in the overall pattern. Exact numbers vary between studies, and many studies still include fewer women than men.

The Bottom Line

• Men with OSA usually show loud snoring, witnessed pauses, and daytime sleepiness.
• Women with OSA more often show fatigue, insomnia, morning headaches, depression, and anxiety.
• Women’s sleep tests can look milder even when their symptoms and health risks are significant.
• Menopause, pregnancy, and PCOS raise OSA risk in women.
• Common screening questionnaires miss many women. A sleep study gives the real answer.

If your sleep is not restoring you, talk with a sleep specialist. The right test can change how you feel every day.

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Disclaimer: This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific symptoms or condition. Do not ignore professional medical advice or delay seeking it because of something you read here.

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