Sleep apnea is remarkably common. An estimated 84 million adults in the United States have obstructive sleep apnea, translating to about 32% of adults aged 20 and older. Globally, the condition affects nearly 1 billion people. Perhaps most striking: roughly 80% of those cases remain undiagnosed.
Prevalence in the United States
A 2024 analysis published in Respiratory Medicine estimated 83.7 million American adults are living with obstructive sleep apnea. That’s nearly one in three adults. Of those, about 59% are male and 41% female, putting the prevalence at 39.1% among men and 26.0% among women after adjusting for obesity rates.
Not all cases are equally serious. Among people with the condition, roughly 52% have mild sleep apnea, 30% have moderate, and 18% have severe. Mild cases involve brief, partial breathing interruptions during sleep that may or may not cause noticeable symptoms. Severe cases involve frequent, prolonged pauses in breathing that significantly fragment sleep and stress the cardiovascular system.
Why Most Cases Go Undiagnosed
About 68.5 million American adults with sleep apnea don’t know they have it. That 80% undiagnosed rate exists partly because the hallmark symptoms, snoring and breathing pauses, happen while you’re asleep. Many people attribute their daytime tiredness to stress, aging, or poor sleep habits rather than a medical condition. Bed partners often notice the problem before the person with sleep apnea does.
This diagnostic gap carries a significant economic cost. The American Academy of Sleep Medicine estimated the annual burden of undiagnosed sleep apnea at $149.6 billion, including $86.9 billion in lost productivity, $26.2 billion from motor vehicle accidents, and $6.5 billion from workplace accidents. Diagnosing and treating every case would produce an estimated $100 billion in annual savings.
Men, Women, and Hormonal Shifts
Sleep apnea has long been considered a condition that primarily affects men, and the numbers support that: population studies consistently find that men are two to three times more likely to have it. Early research from the Wisconsin Cohort Study in the 1990s found that 24% of men had at least mild sleep-disordered breathing compared to 9% of women.
But the gap narrows significantly after menopause. The loss of estrogen and progesterone appears to remove a protective effect these hormones have on the muscles that keep the airway open during sleep. Post-menopausal women develop sleep apnea at rates similar to men of the same age. This hormonal shift also brings increased rates of obesity and cardiovascular disease, both of which compound the risk. Because sleep apnea in women often presents with different symptoms (insomnia, fatigue, and mood changes rather than loud snoring), it tends to be underdiagnosed even more frequently than in men.
How Age Changes the Numbers
Sleep apnea becomes more common with every decade of life. Among adults aged 70 to 85, roughly 33% had the condition in 2020, and projections suggest that will climb to nearly 54% by 2050. For men in that age range, the current prevalence is about 46%, expected to reach 63%. For older women, prevalence is projected to nearly double, rising from 23% to 45% over the same period.
Children get sleep apnea too, though at much lower rates. Between 1% and 5% of children are affected, with the peak occurring between ages 2 and 6, when tonsils and adenoids are largest relative to airway size. Enlarged tonsils are the most common cause in children, and surgical removal often resolves the problem entirely.
Obstructive vs. Central Sleep Apnea
When people talk about sleep apnea, they almost always mean the obstructive type, where the throat muscles relax and physically block the airway during sleep. Central sleep apnea, where the brain temporarily stops sending signals to the breathing muscles, is far less common. Data from the Sleep Heart Health Study found central sleep apnea in less than 1% of the general population. Even among people with heart failure, who are at the highest risk for the central type, obstructive sleep apnea was still far more prevalent at 55% compared to 4% for central.
The Weight Connection
Excess body weight is the strongest modifiable risk factor for obstructive sleep apnea. Fat deposits around the neck and throat narrow the airway, and abdominal fat pushes the diaphragm upward, reducing lung volume. The Wisconsin Sleep Cohort Study tracked participants over four years and found that a 10% increase in body weight produced a 32% increase in breathing disruptions during sleep and a six-fold increase in the risk of developing moderate to severe sleep apnea. That relationship works in reverse too: weight loss consistently reduces the severity of the condition, and in some cases eliminates it.
Other risk factors include having a naturally narrow airway, a large tongue, a recessed jaw, nasal congestion, smoking, and a family history of the condition. But weight is the factor with the most direct, dose-dependent relationship to severity, and it’s the one most within your control.
Signs You Might Be in the Undiagnosed Majority
Given that four out of five cases go undetected, it’s worth knowing the patterns. Loud, chronic snoring is the most recognizable sign, especially if it’s punctuated by gasping or choking sounds. But plenty of people with sleep apnea don’t snore loudly, particularly women. Other indicators include waking up with a dry mouth or headache, feeling unrested despite a full night’s sleep, excessive daytime sleepiness, difficulty concentrating, and irritability. If you regularly sleep seven or more hours and still feel exhausted during the day, sleep apnea is one of the more likely explanations.
Home sleep tests have made diagnosis considerably easier than it used to be. Rather than spending a night in a sleep lab, many people can now wear a small monitoring device at home that tracks breathing patterns, oxygen levels, and heart rate overnight. The results give a clear picture of whether breathing interruptions are occurring and how severe they are.