Sleep Apnea in Women: Why It's Underdiagnosed and What to Know

The Gender Gap in Sleep Apnea Diagnosis

Sleep apnea has long been considered a condition that primarily affects men. The stereotypical patient is an overweight, middle-aged man who snores loudly. That image has shaped how doctors screen, how studies are designed, and how the public thinks about the condition. The problem is that it's incomplete, and dangerously so.

Research estimates that women make up approximately 40% of obstructive sleep apnea (OSA) cases, yet they are diagnosed at significantly lower rates than men. A landmark study published in the journal Sleep found that women with moderate to severe OSA were substantially less likely to receive a diagnosis than men with the same severity. The Wisconsin Sleep Cohort Study estimated that roughly 90% of women with moderate to severe sleep apnea remain undiagnosed.

This isn't because women don't have sleep apnea. It's because sleep apnea often looks different in women, and both patients and providers miss the signs. If you're wondering whether you might have sleep apnea, our guide on common sleep apnea symptoms covers the classic warning signs in detail. But for women, the picture is more nuanced.

Symptoms That Look Different in Women

The textbook symptoms of sleep apnea (loud snoring, witnessed breathing pauses, gasping awake) are based largely on research in male populations. Women with sleep apnea frequently present with a different set of complaints, which is one of the main reasons they're missed.

Fatigue and Daytime Exhaustion

Both men and women with sleep apnea experience daytime sleepiness, but women are more likely to describe their primary symptom as "fatigue" or "exhaustion" rather than "sleepiness." This distinction matters clinically. Sleepiness is falling asleep during a meeting. Fatigue is feeling drained, depleted, and unable to function at your normal level even though you technically stay awake. When women report fatigue, it often gets attributed to stress, parenting demands, or depression rather than an underlying sleep disorder.

Insomnia and Difficulty Staying Asleep

Research published in the Journal of Clinical Sleep Medicine shows that women with OSA are more likely to report insomnia symptoms, including difficulty falling asleep, frequent awakenings, and early morning waking. In men, sleep apnea typically causes them to fall asleep easily but sleep poorly. In women, the pattern can look like traditional insomnia, which leads to misdiagnosis and treatment with sleep aids rather than a sleep study.

Morning Headaches

Women with sleep apnea report morning headaches at a higher rate than men. These headaches result from overnight oxygen desaturations (drops in blood oxygen levels caused by repeated breathing pauses). The headaches tend to be dull and diffuse, present upon waking, and resolve within a few hours. They're often attributed to tension, stress, or migraines.

Anxiety and Depression

Multiple studies, including research from the European Respiratory Journal, have found that women with undiagnosed sleep apnea are more likely to present with mood disorders, including anxiety, depression, and irritability. Sleep fragmentation disrupts the brain's ability to regulate mood and process emotions. When a woman visits her doctor reporting anxiety, poor sleep, and fatigue, the evaluation often stops at a mental health diagnosis without investigating a sleep disorder as the root cause.

Lighter or Absent Snoring

Women with sleep apnea are less likely to snore loudly or may snore in a way that's softer and less disruptive. This matters because snoring is the number one trigger for partners to raise the alarm. If a woman's breathing disruptions aren't audible enough to wake her partner, that critical early warning signal never fires. Learn more about why snoring is worth paying attention to, even when it seems mild.

Hormonal Factors: Menopause, Pregnancy, and Beyond

Hormones play a significant role in why sleep apnea prevalence and presentation differ between men and women.

Estrogen and Progesterone as Protective Factors

Before menopause, estrogen and progesterone appear to help maintain upper airway muscle tone and influence how the brain controls breathing during sleep. Progesterone, in particular, acts as a respiratory stimulant. These hormones may partially explain why premenopausal women have lower rates of OSA compared to men of the same age.

Menopause Increases Risk 2 to 3 Times

The protective effect of reproductive hormones diminishes during perimenopause and disappears after menopause. Research from the Sleep Heart Health Study and the Wisconsin Sleep Cohort Study shows that postmenopausal women have a 2 to 3 times higher risk of developing OSA compared to premenopausal women. Weight gain during menopause contributes as well, but even after controlling for BMI, the hormonal shift itself is an independent risk factor.

If you're going through menopause and experiencing new or worsening fatigue, insomnia, or morning headaches, sleep apnea is worth discussing with your physician. These symptoms overlap heavily with common menopausal complaints, which is exactly why they get overlooked.

Pregnancy and Sleep Apnea

Pregnancy increases the risk of sleep-disordered breathing, particularly in the second and third trimesters. Weight gain, fluid retention, nasal congestion, and hormonal changes all contribute. Research published in Obstetrics & Gynecology has linked gestational sleep apnea to increased risk of gestational hypertension, preeclampsia, and gestational diabetes.

Pregnant women who snore, experience excessive daytime sleepiness, or have witnessed breathing pauses should discuss sleep apnea screening with their OB-GYN or midwife. Treatment during pregnancy is safe, and CPAP is considered the first-line therapy for pregnant women with OSA.

Body Weight Distribution Differences

The relationship between weight and sleep apnea works differently in men and women. Men tend to accumulate fat around the neck and upper airway, which directly narrows the airway during sleep. Women tend to store fat in the hips, thighs, and lower body. This means women can have clinically significant sleep apnea at a lower BMI and a smaller neck circumference than the thresholds typically used for screening.

Standard screening questionnaires (like the STOP-BANG) use neck circumference cutoffs that were validated primarily in male populations. A woman with a neck circumference of 15 inches may not trigger a screening flag, but she may still have significant airway obstruction. This is another layer of the diagnostic gap.

For more on the relationship between weight and sleep apnea, see our guide on sleep apnea and weight loss.

How Diagnosis Differs for Women

If you suspect you have sleep apnea, the diagnostic process is the same for everyone: talk to your doctor and get a sleep study. But there are a few things women should know.

Advocate for a Sleep Study

Because women's symptoms often don't match the classic male profile, some providers may not immediately think of sleep apnea. If you report fatigue, insomnia, and morning headaches, be direct: "I'd like to rule out sleep apnea with a sleep study." You don't need to fit the stereotypical profile. A home sleep test is a convenient first step, and your doctor can order one based on your symptoms alone.

Severity May Be Underestimated

Research from the American Journal of Respiratory and Critical Care Medicine suggests that standard AHI (apnea-hypopnea index) cutoffs may underestimate severity in women. Women tend to have more hypopneas (partial airway blockages) and fewer complete apneas, and their events tend to cluster during REM sleep rather than distributing evenly across the night. A "mild" AHI in a woman may correspond to more significant symptoms than the same number would predict in a man.

CPAP Considerations for Women

Once diagnosed, CPAP therapy is highly effective for women with sleep apnea. A few considerations can make the experience more comfortable.

AutoSet for Her Mode

ResMed AirSense machines include an "AutoSet for Her" mode, which uses a different pressure delivery algorithm designed for the way women's breathing events tend to present. This mode responds more gently to flow limitation and is designed to be less disruptive to lighter sleepers. Ask your sleep physician about this option. Learn more about how ResMed AirSense machines handle your data and understanding pressure settings.

Smaller Mask Options

Women generally have smaller facial structures, and a mask that fits well is the single biggest factor in CPAP comfort and compliance. Nasal pillow masks with smaller cushion sizes and masks specifically designed for smaller faces tend to work best. The ResMed AirFit N30i (opens in new tab) (opens in new tab) is a popular option for women because of its compact cradle design and top-of-head hose connection. For an overview of all mask types and how to choose, see our CPAP mask types guide.

Mask liners (opens in new tab) (opens in new tab) can also help with skin sensitivity and reduce pressure marks, particularly for women who find that silicone cushions irritate their skin or leave red marks on their face.

Pillow Compatibility

If you sleep on your side (which many women do), a CPAP-compatible pillow (opens in new tab) (opens in new tab) with cutouts for the mask can make a significant difference in comfort and seal. Standard pillows push against the mask frame and cause leaks, especially with full-face or nasal masks. For more pillow recommendations, see our best CPAP masks for side sleepers guide.

When to Talk to Your Doctor

Consider speaking with your physician about sleep apnea screening if you experience any of the following:

• Persistent fatigue that doesn't improve with more sleep or better sleep hygiene
• Insomnia that hasn't responded to standard treatments
• Morning headaches that occur regularly and resolve on their own within a few hours
• Your partner reports snoring, breathing pauses, or restless sleep
• You are postmenopausal and experiencing new or worsening sleep problems
• You are pregnant and have developed snoring or excessive daytime sleepiness
• Anxiety or depression that developed alongside worsening sleep quality
• High blood pressure that is difficult to control with medication, particularly if it's elevated in the morning

Don't wait for a textbook presentation. Women's sleep apnea frequently doesn't look like the textbook. If multiple items on this list resonate, a sleep study is a straightforward way to get answers.

Closing the Gap

The underdiagnosis of sleep apnea in women is a well-documented problem, but awareness is growing. More sleep specialists are recognizing atypical presentations, and screening tools are evolving to account for gender differences. The most important step you can take is to advocate for yourself. If you suspect your sleep quality is affecting your health, push for a sleep study. The treatment is effective, the diagnosis is straightforward, and the difference in how you feel can be profound.

If you've already been diagnosed and started CPAP therapy, understanding your data is the next step. Your machine records detailed metrics every night, and those numbers tell you whether your therapy is working.

See how CPAP Clarity turns your SD card data into clear, actionable insights →