Sleep apnea is extremely common. An estimated 936 million adults worldwide between the ages of 30 and 69 have some form of obstructive sleep apnea, making it one of the most prevalent chronic conditions on the planet. In the United States alone, roughly one in three men and one in six women meet the criteria. Despite those numbers, the vast majority of cases go undetected. Approximately 90% of adults with obstructive sleep apnea have never been diagnosed.
How Common Each Type Is
There are two main types of sleep apnea, and they are not equally common. Obstructive sleep apnea, where the airway physically collapses or becomes blocked during sleep, accounts for the overwhelming majority of cases. In a large study of nearly 6,000 adults, 47.6% had obstructive sleep apnea while only 0.9% had central sleep apnea, the type where the brain intermittently fails to send the right signals to the muscles that control breathing. Even among people with heart failure, a group considered high-risk for central sleep apnea, obstructive sleep apnea was still far more prevalent (55% vs. 4%). When people talk about sleep apnea in general, they’re almost always referring to the obstructive form.
Prevalence in Men vs. Women
Men develop sleep apnea at significantly higher rates than women. In the general population, the male-to-female ratio falls between 3-to-1 and 5-to-1. In sleep clinics, that gap widens even further, reaching 8-to-1 or 10-to-1, likely because men tend to have more classic symptoms like loud snoring that prompt a referral. In the U.S., 33.9% of men and 17.4% of women have at least mild obstructive sleep apnea.
The gap narrows substantially after menopause. Postmenopausal women are 3.5 times more likely to have sleep apnea than premenopausal women, and estimates of prevalence among women in their 50s and 60s range from 4% to 22%. Hormonal changes, particularly the decline of progesterone (which helps keep the upper airway open), appear to drive this shift.
How Age Affects Your Risk
Sleep apnea becomes progressively more common with age. Among men, prevalence rises from about 3% in the 20-to-44 age range to 11% in middle age (45 to 64) and 18% after age 60. Women follow a similar upward trend, going from under 1% in young adulthood to 2% in middle age and 7% after 60. The combination of age-related changes in muscle tone, increased body weight, and (in women) menopause creates a compounding effect that makes sleep apnea far more likely in later decades.
Sleep Apnea in Children
Sleep apnea is not limited to adults. Global estimates suggest 1% to 5% of children have obstructive sleep apnea, most often caused by enlarged tonsils and adenoids rather than the tissue collapse seen in adults. A large U.S. study of children aged 5 to 12 found that about 25% had at least one breathing disruption per hour of sleep, though only around 1% had disruptions frequent enough to meet the threshold for a clinical diagnosis. Regular snoring, reported by parents in about 7.5% of children, is the most common warning sign.
Rates vary by population. One study of Indian school-aged children reported a prevalence of 9.6%, and African American children are four to six times more likely to have sleep apnea compared to white children.
Weight Is the Biggest Modifiable Risk Factor
Obesity and sleep apnea are tightly linked. Among people who qualify for bariatric surgery, 77% have obstructive sleep apnea. Excess weight, particularly around the neck and upper airway, narrows the space available for airflow during sleep. This relationship also explains much of the variation seen across racial and ethnic groups. African Americans, Hispanic Americans, and Native Americans all show higher rates of sleep apnea than white Americans, but when researchers account for differences in body mass index, those disparities largely disappear. In other words, the elevated rates in these groups are driven primarily by higher rates of obesity, not by inherent biological differences in airway anatomy.
One notable exception: people of Asian descent have rates of sleep apnea comparable to white populations despite markedly lower levels of obesity. Differences in facial bone structure, particularly a smaller or more recessed jaw, appear to play a larger role in this group.
Why So Many Cases Go Undiagnosed
The roughly 90% undiagnosed rate makes sleep apnea one of the most under-recognized conditions in medicine. Several factors contribute. The most obvious symptoms, breathing pauses and loud snoring, happen while you’re asleep, so you may have no awareness of them unless a bed partner notices. Daytime symptoms like fatigue, morning headaches, and difficulty concentrating are easy to attribute to stress, poor sleep habits, or aging. Women are especially likely to be missed because they tend to present with insomnia, mood changes, or fatigue rather than the stereotypical loud snoring.
Diagnosis historically required an overnight stay in a sleep lab, which created a bottleneck. Home sleep tests have made screening more accessible, and in studies of surgical patients screened before operations, portable monitors detected sleep apnea in 82% of high-risk individuals who had never been diagnosed. If you snore regularly, wake up feeling unrefreshed despite a full night of sleep, or have been told you stop breathing at night, those are strong signals worth investigating.
Severity Ranges Widely
Not all sleep apnea is equal. Severity is measured by how many times per hour your breathing is disrupted during sleep. Mild sleep apnea involves 5 to 14 disruptions per hour, moderate involves 15 to 30, and severe means more than 30. Globally, about 936 million adults fall somewhere on this spectrum, but roughly 425 million, less than half, have moderate to severe disease. Many people with mild sleep apnea are asymptomatic or have minimal daytime impairment, which is another reason the condition flies under the radar so often. Moderate and severe cases carry significantly higher risks for high blood pressure, heart disease, stroke, and type 2 diabetes, making detection at those levels more urgent.