There’s a persistent myth in sleep medicine that obstructive sleep apnea (OSA) is primarily a man’s disease. The classic patient profile — overweight, middle-aged male, loud snorer — has been drilled into medical training for decades. But this narrow picture is doing real harm. Women with OSA are being missed, misdiagnosed, or told their symptoms are “just stress.”

The numbers tell a striking story. While older studies suggested a male-to-female ratio of about 8:1, more recent epidemiological data from the Wisconsin Sleep Cohort Study puts the actual ratio closer to 2:1 or 3:1. That’s a massive gap between who has OSA and who’s getting diagnosed with it.

Why Women Present Differently

The reason so many women slip through the diagnostic net comes down to how they experience the condition. Men tend to report the “textbook” symptoms: heavy snoring, witnessed apneas, daytime sleepiness. Women? Not so much.

Women with OSA more commonly report:

• Fatigue rather than classic sleepiness (there’s a real clinical difference)
• Insomnia, particularly difficulty maintaining sleep
• Morning headaches
• Mood disturbances, including anxiety and depression
• Cognitive complaints like brain fog or poor concentration

A woman might walk into her GP’s office complaining of exhaustion, trouble sleeping, and feeling down. What happens next? She’s often prescribed an antidepressant or told to practice better sleep hygiene. The possibility of a breathing disorder during sleep doesn’t even make it onto the differential.

The Hormonal Connection

Hormones play a huge role in this story, and it’s something we’re only starting to fully appreciate. Estrogen and progesterone appear to protect the upper airway musculature. Progesterone, in particular, acts as a respiratory stimulant — it literally helps keep the airway open during sleep.

This explains why OSA prevalence in women rises dramatically after menopause. Research published in the European Respiratory Journal has shown that postmenopausal women who aren’t on hormone replacement therapy have OSA rates approaching those of men in the same age group.

Pregnancy is another high-risk period. The weight gain, fluid retention, and hormonal shifts of late pregnancy can all contribute to airway narrowing. Yet routine screening for sleep-disordered breathing during pregnancy remains uncommon, despite growing evidence linking untreated OSA to gestational hypertension and preeclampsia.

Anatomical and Physiological Differences

Women’s airways tend to be anatomically different from men’s. The pharyngeal airway is generally shorter and less collapsible in premenopausal women. Fat distribution matters too — men deposit fat preferentially around the neck and upper airway, while women tend toward peripheral fat distribution until menopause shifts that pattern.

These differences mean that when women do have OSA, the polysomnographic presentation often looks different. Women are more likely to have:

• REM-predominant apneas (events clustering in REM sleep rather than throughout the night)
• Longer hypopneas with more subtle oxygen desaturations rather than complete apneas
• Lower overall AHI scores that can fall below diagnostic thresholds even when clinically significant disease is present

This last point is critical. The standard AHI cutoff of 5 events per hour was established largely through studies on male populations. A woman might have an AHI of 4 and still be suffering meaningful sleep fragmentation and daytime impairment.

What Needs to Change

First, screening tools need updating. The STOP-BANG questionnaire, widely used in clinical practice, was originally validated in surgical populations that skewed heavily male. The Berlin Questionnaire captures some female-relevant symptoms better, but we probably need purpose-built screening instruments that account for how women describe their symptoms.

Second, clinicians across all specialties need education. Psychiatrists seeing treatment-resistant depression, cardiologists managing unexplained hypertension, OB-GYNs caring for high-risk pregnancies — all of these providers should be thinking about OSA as a possibility.

Third, we should probably revisit how we interpret sleep study data in women. REM-specific AHI scoring, respiratory effort-related arousals (RERAs), and subjective symptom burden all deserve more weight in the diagnostic process.

The Personal Cost

I’ve seen women in clinic who’ve spent five, ten, even fifteen years bouncing between specialists before someone finally orders a sleep study. By that point, they’ve collected diagnoses — depression, chronic fatigue syndrome, fibromyalgia — that may have been either caused or worsened by untreated OSA.

When they finally get on CPAP or another appropriate therapy, the transformation can be remarkable. But those are years they can’t get back. Years of impaired quality of life, strained relationships, and unnecessary medications.

The fix isn’t complicated. It starts with asking the right questions and being willing to look beyond the stereotypical patient profile. Sleep apnea doesn’t care about gender stereotypes, and neither should we.