Central vs obstructive sleep apnea: key differences

Updated 2026-11-05

Central and obstructive sleep apnea are different breathing disorders that occur during sleep. In obstructive sleep apnea, the airway becomes blocked and airflow stops despite continued breathing effort; in central sleep apnea, the brain temporarily fails to signal the muscles to breathe, so airflow stops with little or no effort. Both can cause fragmented sleep, daytime sleepiness, and cardiovascular problems, and a person can have both conditions.

What is the central vs obstructive sleep apnea difference?

The key difference is what happens to the airway and breathing muscles.

With obstructive sleep apnea (OSA), the throat muscles relax during sleep and the airway narrows or closes. The chest and diaphragm continue trying to move, sometimes causing snoring, choking sounds, or brief arousals. Oxygen levels may fall when breathing repeatedly stops or becomes reduced.

With central sleep apnea (CSA), the airway may remain open, but the brain’s respiratory control system temporarily stops initiating a breath. The chest may remain still because the body is not receiving the expected signal to inhale. CSA can occur with certain heart, kidney, neurologic, or medication-related conditions, although its specific cause may not always be clear.

The terms “central vs obstructive sleep apnea” are sometimes used as if the disorders always exist separately. In practice, some people have complex sleep apnea, involving central events, obstructive events, or both. A sleep study is usually needed to distinguish the patterns.

Feature	Central sleep apnea	Obstructive sleep apnea
Main problem	Temporary lack of respiratory effort	Repeated airway blockage or narrowing
Airway	Usually remains open	Upper airway becomes blocked or collapses
Breathing effort	Often little or none	Usually present, sometimes forceful
Common sound pattern	Quiet pauses or sudden changes in breathing	Snoring, snorting, choking, or gasping
Typical triggers	Medical conditions, medications, or other sleep mechanisms	Sleep-related relaxation of tongue, throat, or airway tissues
Main treatment approach	Address the underlying cause; support breathing when appropriate	Keep the airway open, commonly with CPAP or another prescribed option

What do central and obstructive sleep apnea symptoms look like?

Both forms can cause frequent awakenings, unrefreshing sleep, and difficulty concentrating. People may also experience morning headaches, irritability, and excessive sleepiness. These symptoms are not enough to determine which type of sleep apnea is present.

OSA is more strongly associated with loud snoring, witnessed breathing pauses, and a choking or gasping sensation during sleep. CSA may involve repeated quiet pauses or periods of unusually rapid breathing afterward. Sometimes a bed partner or wearable device notices the episodes before the sleeper does.

Other conditions can resemble sleep apnea, including insomnia, restless legs syndrome, asthma, and nighttime anxiety. The National Heart, Lung, and Blood Institute explains that sleep apnea can cause breathing interruptions during sleep, while the CDC emphasizes that symptoms may include loud snoring, breathing pauses, and daytime sleepiness.

How do doctors distinguish the two types?

Doctors usually begin with the person’s symptoms, medical history, medications, and examination. They may ask about observed breathing pauses, snoring, sleep position, heart or kidney conditions, and use of sedatives or opioids.

The main diagnostic test is a polysomnography, or sleep study, which records breathing, oxygen level, heart rhythm, and sleep stages. A home sleep apnea test may also be used for some adults. The American Academy of Sleep Medicine provides patient and clinician information about sleep testing and the diagnosis of sleep apnea.

The distinction usually depends on whether breathing effort continues during an event. In an obstructive event, airflow falls while respiratory effort persists. In a central event, airflow falls because breathing effort is absent or markedly reduced. Testing can also measure patterns, oxygen changes, body position, and other sleep-related events.

How are the two types treated differently?

Treatment for CSA starts by identifying and addressing contributing factors. A clinician may review medications that affect breathing, treat an underlying heart, kidney, or neurologic condition, or use a nasal oxygen device when appropriate. Some people with CSA also benefit from positive airway pressure. Treatment decisions depend on the type and severity of central events.

For OSA, a common first-line treatment is continuous positive airway pressure (CPAP), a device that delivers air through a mask to keep the airway open. Oral appliances, positional therapy, weight-management support when appropriate, and selected surgical or implanted treatments may also be considered. The Cleveland Clinic provides an overview of common treatment options.

Treatment is not the same for everyone. A sleep specialist can help select a device, check whether an effective pressure or setting has been reached, and address persistent symptoms or equipment problems. Medicare coverage rules for diagnostic sleep studies can vary by plan and circumstances; coverage for home testing and portable devices may also differ, as summarized by Medicare.

How do you choose the right evaluation and treatment?

The right path depends on symptoms, health history, and the results of testing rather than symptoms alone. A suspected CSA case may require attention to an underlying condition or medication, while suspected OSA often leads to airway-stabilization treatment.

What happens from concern to treatment?

Recognize the pattern: Note or record snoring, witnessed pauses, gasping, restless sleep, morning headaches, or excessive sleepiness.
Arrange clinical evaluation: A primary care clinician or sleep specialist reviews symptoms, health conditions, medications, and examination findings.
Complete appropriate testing: A sleep study measures airflow, breathing effort, oxygen levels, and sleep stages to distinguish obstructive, central, or mixed events.
Identify contributing factors: Clinicians evaluate conditions or medications that may be causing central events and assess factors contributing to airway obstruction.
Start and review treatment: The prescribed approach is monitored for control of breathing events, sleep quality, daytime symptoms, adherence, and possible side effects.

When to see a doctor

Seek prompt medical advice if you experience any of the following:

Repeated breathing pauses, choking, or gasping during sleep
Loud snoring with daytime sleepiness or witnessed pauses
Chest pain, severe shortness of breath, or marked trouble breathing while awake
Fainting, confusion, or severe morning headaches
Sleepiness that creates a serious driving, work, or safety risk
A new irregular heartbeat, fainting episode, or worsening swelling while sleeping
Persistent breathing changes after starting a sleep-apnea device or new medication

Urgent medical care is appropriate for severe breathing difficulty, chest pain, fainting, or signs of a significant cardiovascular or respiratory emergency. Routine evaluation is appropriate when repeated symptoms are affecting sleep, work, driving, or quality of life.

FAQ

Can I have central and obstructive sleep apnea at the same time?

Yes. A person can have obstructive, central, and mixed breathing events during the same sleep study. This is sometimes called complex sleep apnea. The proportions and causes of those events help clinicians select treatment.

Is central sleep apnea more dangerous than obstructive sleep apnea?

Neither type is automatically more dangerous. Risk depends on the number and duration of breathing events, oxygen changes, heart effects, symptoms, and underlying illnesses. Both conditions can be medically important and should be evaluated.

Does snoring always mean obstructive sleep apnea?

No. Snoring can occur without sleep apnea, and some people with OSA do not snore loudly. Snoring becomes more suggestive of OSA when accompanied by breathing pauses, choking, gasping, or daytime sleepiness.

Can a home sleep test distinguish central from obstructive apnea?

Many home tests are designed to identify obstructive apnea using limited channels. Central events may be harder to classify without measurements of breathing effort or full sleep staging. A clinician may order an attended sleep study if results are unclear or symptoms remain concerning.

Do CPAP machines treat central sleep apnea?

CPAP can help some people, but central apnea often requires treatment directed at its cause or specialized breathing support. Device choice and settings depend on the underlying condition and test results, so treatment should be prescribed and reviewed by a qualified clinician.

Can lifestyle changes eliminate sleep apnea?

Lifestyle changes may reduce risk or improve treatment outcomes, but they do not reliably eliminate every type of sleep apnea. Weight changes, avoiding alcohol or sedatives around bedtime, and improving sleep routines may help some people, but persistent pauses or significant symptoms still warrant medical evaluation. The MedlinePlus sleep apnea guide provides additional patient information.

Sources

This article is for general information and is not medical advice.

Medical disclaimer. This article is for general information and is not medical advice. It does not replace an assessment by a qualified clinician. See our editorial policy.