What Is Obstructive Sleep Apnea?

Obstructive sleep apnea (OSA) is a common and potentially serious sleep disorder in which breathing repeatedly stops and starts during sleep. It's the most common type of sleep apnea.

When a healthy person sleeps, the muscles at the back of the throat keep the airway open so air can flow freely into the lungs. In someone with OSA, these muscles relax too much during sleep, allowing the airway to narrow or close. When the airway closes, breathing stops, oxygen levels fall, and the brain briefly rouses the body from sleep just enough to reopen the airway and resume breathing.

These disruptions usually last only a few seconds, but they interfere with the ability to reach deep, restorative stages of sleep, including REM sleep. Once breathing resumes, the person falls back asleep, and the cycle repeats — sometimes dozens of times an hour, all night long.

What Are the Symptoms of Obstructive Sleep Apnea?

Because the breathing pauses themselves happen during sleep, many people with OSA aren't aware anything is wrong and may believe they slept fine all night. The symptoms are usually noticed by a bed partner, or show up as daytime effects rather than anything felt during sleep itself. Common symptoms include:

• Loud, chronic snoring
• Silent pauses in breathing during sleep, often noticed by a partner
• Gasping, choking, or snorting sounds while sleeping
• Waking up with a dry mouth or sore throat
• Morning headaches
• Excessive daytime sleepiness, even after a full night in bed
• Difficulty concentrating or memory problems
• Irritability or mood changes
• Waking up frequently during the night

Do Symptoms Look Different in Men and Women?

Yes, and this is one of the more clinically important patterns in OSA. Symptoms in men more often match the "classic" presentation — loud snoring, witnessed breathing pauses, and choking or gasping sounds reported by a partner. Women with OSA are less likely to snore loudly or have witnessed apneas, and more often report symptoms that can be mistaken for other conditions, including:

Because this presentation overlaps with fatigue, mood disorders, and insomnia, sleep apnea in women is more frequently underdiagnosed or diagnosed later. If you're experiencing persistent fatigue or mood changes alongside poor sleep quality, it's worth discussing sleep apnea specifically with a healthcare provider, even without loud snoring.

What Causes Obstructive Sleep Apnea?

OSA occurs when the muscles in the back of the throat relax too much during sleep to maintain normal breathing. These muscles support the soft palate, the uvula (the triangular piece of tissue hanging from the soft palate), the tonsils, and the tongue.

When these muscles relax, the airway narrows or closes as you breathe in, and airflow can become inadequate for 10 to 20 seconds or longer. This drop in airflow lowers the oxygen level in the blood. The brain senses this and briefly rouses the body from sleep so the airway can reopen — an awakening that's usually so brief the person doesn't remember it. This pattern can repeat five to 30 times or more per hour, all night long, and it's what prevents people with OSA from reaching deep, restful sleep.

What Increases the Risk of Sleep Apnea?

Several factors are commonly associated with a higher risk of OSA, including excess weight, a naturally narrow airway, a thicker neck circumference, nasal congestion, smoking, alcohol or sedative use, and a family history of sleep apnea. Risk also increases with age, and while OSA is more commonly diagnosed in men, the risk for women rises notably after menopause. For a fuller breakdown, see our dedicated guide on Sleep Apnea Risk Factors.

How Is Sleep Apnea Diagnosed?

Sleep apnea is typically diagnosed through a sleep study, either an in-lab polysomnography or a home sleep apnea test, which measures how often breathing pauses occur during sleep along with oxygen levels and other indicators. The results are used to calculate a measure called the apnea-hypopnea index (AHI), which helps a healthcare provider determine whether sleep apnea is present and how severe it is. If you suspect you may have sleep apnea, a conversation with your doctor is the right first step toward getting an accurate diagnosis.

How Is Sleep Apnea Treated?

Continuous positive airway pressure (CPAP) therapy is the most common and widely recommended treatment for obstructive sleep apnea. A CPAP machine delivers a steady stream of pressurized air through a mask, keeping the airway open throughout the night so breathing doesn't stop. For some patients, a BiLevel (BiPAP) machine, which delivers different pressure levels for inhaling and exhaling, may be prescribed instead. Other treatment options can include oral appliances, positional therapy, weight management, and in some cases surgery, depending on the cause and severity of a person's OSA. Your sleep physician can help determine which treatment approach is right for your specific diagnosis.

If you've been prescribed CPAP or BiLevel therapy, GoCPAP carries a full range of Auto-Adjusting CPAP Machines, BiLevel & BiPAP Machines, and CPAP Masks to fit your prescription and comfort needs.

When Should You See a Doctor?

Talk to a healthcare provider if you or a bed partner notices loud snoring, witnessed pauses in breathing, gasping or choking during sleep, or if you experience ongoing daytime sleepiness, morning headaches, or difficulty concentrating despite getting what should be a full night's sleep. Untreated sleep apnea is associated with a range of health complications over time, covered in more detail in our guide on Sleep Apnea Complications.

Frequently Asked Questions

Can you have sleep apnea without snoring?

Yes. While loud snoring is a common symptom, especially in men, some people with sleep apnea, particularly women, don't snore loudly or have witnessed breathing pauses at all. Fatigue, insomnia, and morning headaches can be the more prominent signs instead.

Is sleep apnea dangerous?

Left untreated, sleep apnea can contribute to a range of health issues over time. See our Sleep Apnea Complications guide for more detail, and speak with your doctor about your specific health risks.

What's the difference between obstructive and central sleep apnea?

Obstructive sleep apnea happens when the throat muscles relax and physically block the airway. Central sleep apnea is different: it occurs when the brain doesn't send the correct signals to the muscles that control breathing, even though the airway itself isn't blocked. OSA is far more common of the two.

What is the machine used to treat sleep apnea called?

The most common treatment device is a CPAP (continuous positive airway pressure) machine. Some patients are prescribed a BiLevel or BiPAP machine instead, which delivers two different pressure levels for inhaling and exhaling.

Can sleep apnea be cured, or only managed?

For many people, sleep apnea is a long-term condition managed with CPAP therapy, weight management, or other approaches rather than something that's permanently cured. In some cases, particularly when a specific anatomical cause is identified, surgery may significantly reduce or resolve symptoms. Your sleep physician can advise on the outlook for your specific situation.