Sleep Apnea Risk Factors: Are You at Risk?

Most People With Sleep Apnea Don't Know They Have It

An estimated 80% of moderate to severe obstructive sleep apnea (OSA) cases remain undiagnosed. Many people live with fragmented sleep, chronic fatigue, and mounting cardiovascular risk for years without connecting the dots.

The good news: several well-studied risk factors can help predict whether you're likely to have OSA. The STOP-BANG questionnaire organizes eight of these factors into a quick screening tool used by sleep clinicians worldwide.

The Eight STOP-BANG Risk Factors

Snoring

Loud, habitual snoring is the most common symptom of OSA. When the airway partially collapses during sleep, air passing through the narrowed space vibrates soft tissue and produces the sound. Not everyone who snores has sleep apnea, but nearly everyone with OSA snores.

"Loud" in clinical terms means louder than talking or audible through a closed door. If a bed partner or family member has commented on your snoring, that counts.

Tiredness

Excessive daytime sleepiness, fatigue that persists despite what should be enough sleep, and difficulty staying awake during passive activities (reading, watching TV, riding as a passenger) are hallmark consequences of OSA. Each time your airway collapses, your brain briefly wakes to restore breathing. These micro-arousals fragment your sleep architecture even if you don't remember waking up.

Observed Apnea

If someone has witnessed you stop breathing, choke, or gasp during sleep, that is one of the strongest indicators of OSA. Many people are unaware this is happening. Bed partners, family members, or roommates are often the first to notice.

Blood Pressure

OSA and hypertension are closely linked. Repeated oxygen drops during apnea events trigger a stress response that raises blood pressure over time. An estimated 30–50% of people with hypertension also have OSA. If you are being treated for high blood pressure, especially if it is resistant to medication, OSA may be a contributing factor.

BMI Over 35

Excess body weight, particularly around the neck and upper airway, increases the likelihood of airway collapse during sleep. A BMI above 35 (class II obesity) is a significant risk factor. However, OSA occurs at every BMI. Thin people with certain jaw or airway anatomy can absolutely have sleep apnea.

Not sure about your BMI? The STOP-BANG screener includes a built-in BMI calculator.

Age Over 50

The prevalence of OSA increases with age. Muscle tone throughout the body decreases as we get older, and the muscles that hold the airway open during sleep are no exception. Hormonal changes, particularly after menopause in women, further increase risk.

Neck Circumference Over 16 Inches

A larger neck circumference correlates with more soft tissue around the airway, which increases the chance of collapse. The clinical threshold is 16 inches (40 cm) for men and 15 inches (38 cm) for women. A men's dress shirt collar size 16+ is a rough equivalent.

Male Sex

Men are 2–3 times more likely to have OSA than premenopausal women. Differences in fat distribution, airway anatomy, and hormonal protection all play a role. After menopause, the gap narrows significantly. Sleep apnea in women is frequently underdiagnosed because symptoms often present differently.

Risk Factors You Can Change

Some risk factors on this list are fixed: you cannot change your age, sex, or neck anatomy. But several are modifiable, and addressing them can meaningfully reduce your OSA severity.

Weight loss is the single most impactful lifestyle change. Research suggests that a 10% reduction in body weight can reduce AHI by 26% or more in overweight patients. This does not replace CPAP, but it can reduce the pressure your machine needs and improve overall outcomes.

Alcohol and sedatives relax airway muscles and worsen OSA. Avoiding alcohol within 3 to 4 hours of bedtime can reduce the number of events per night.

Sleep position matters. Sleeping on your back (supine) increases airway collapse due to gravity. Side sleeping often reduces event frequency. Positional therapy is not a standalone treatment, but it can supplement CPAP therapy.

These changes work alongside treatment, not instead of it. Discuss any modifications with your provider.

When to Get Tested

If three or more of these risk factors apply to you, the clinical recommendation is to discuss a sleep evaluation with your healthcare provider. Testing typically involves either a home sleep test or an in-lab polysomnography. Both are straightforward, and insurance commonly covers them.

You do not need to check every box. Two risk factors plus a bed partner who reports snoring and breathing pauses is worth a conversation with your doctor.

Do not put off testing because you think you would "know" if you had sleep apnea. Most people with moderate to severe OSA are unaware of their nighttime breathing pauses. The symptoms (daytime fatigue, poor concentration, morning headaches) are common enough that many people attribute them to stress, aging, or poor sleep habits rather than a treatable medical condition.

Already Diagnosed?

If you are already using CPAP therapy, you can analyze your SD card data, track your therapy score, and understand your nightly events in detail with CPAP Clarity's free analyzer.

Take the Screener

Ready to check your risk? The STOP-BANG Sleep Apnea Screener takes about two minutes and gives you an instant result with guidance on next steps.