What happens during OSA?
During sleep, the muscles that help keep your throat open relax. In OSA, the tongue and surrounding soft tissues narrow or block the airway. Your chest and diaphragm continue trying to draw air in, but airflow is restricted.
Your brain may briefly rouse you so the airway reopens, sometimes with a snort or gasp. This pattern can repeat throughout the night. Many awakenings are too brief to remember, so a person may spend a full night in bed and still wake feeling unrefreshed. [1]
OSA, central sleep apnea, and snoring
These terms describe different things:
| Condition | What happens | What to know |
|---|---|---|
| Obstructive sleep apnea—OSA | The upper airway narrows or closes while breathing effort continues. | It is the most common type of sleep apnea. |
| Central sleep apnea | The brain does not consistently send the signals needed to breathe. | It can require a different treatment approach. |
| Snoring | Tissues vibrate as air passes through a narrowed airway. | Snoring can occur with or without OSA; its sound alone cannot establish a diagnosis. |
A sleep study helps distinguish obstructive events from central events. [1] [10]
Learn more about snoring and your next step or waking up gasping for air.
Signs of obstructive sleep apnea
You may notice symptoms yourself, or a bed partner may notice changes first.
During sleep, signs can include:
- Loud, frequent snoring
- Breathing that stops and starts
- Gasping or choking
- Trouble staying asleep
- Waking frequently to urinate
During the day, signs can include:
- Sleepiness or fatigue
- Morning headaches
- A dry mouth on waking
- Difficulty concentrating or reacting quickly
Women may report fatigue, headaches, or insomnia rather than the familiar picture of loud snoring. Symptoms vary, and similar symptoms can have other causes. Share your observations with a medical provider rather than using a checklist to diagnose yourself. [2]
The Epworth Sleepiness Scale can help describe daytime sleepiness. It does not diagnose or rule out OSA. [5]
If you are too sleepy to drive safely, do not drive. Discuss the sleepiness with your clinician promptly. [9]
What causes OSA?
OSA usually involves a combination of airway anatomy and other factors. Body weight is one factor, but people of different body sizes can develop OSA.
Factors that can increase risk include:
- Airway anatomy: the size of the tongue or tonsils and the shape of the jaw, face, and upper airway
- Body weight: fatty tissue around the neck can contribute to airway narrowing
- Age: risk increases as people get older
- Sex: OSA is more common in men
- Family history: inherited features can affect airway structure
- Hormonal conditions: including low thyroid hormone and polycystic ovary syndrome
- Certain medical conditions: heart or kidney failure can contribute to fluid buildup around the neck
- Alcohol and smoking: alcohol relaxes airway muscles, while smoking can contribute to inflammation [3]
Having a risk factor does not establish a diagnosis. Not fitting the usual stereotype does not rule OSA out.
How is OSA diagnosed?
A medical evaluation and sleep study help determine whether OSA is present.
A home sleep apnea test may be appropriate for selected adults whose symptoms suggest moderate-to-severe OSA and who do not have complicating conditions. An overnight laboratory sleep study may be more appropriate for people with significant heart or lung disease, a history of stroke, severe insomnia, or other circumstances that affect testing.
If a home test is negative, inconclusive, or technically inadequate, an overnight laboratory study may still be needed. A reassuring home result should not end the evaluation when concerns remain. [5]
A consumer sleep score, questionnaire, or device risk notification is not a standalone diagnosis. Bring any concerns or alerts to your medical provider. [5] [6]
What do mild, moderate, and severe OSA mean?
The apnea–hypopnea index, or AHI, is the average number of breathing pauses and qualifying reductions in airflow per hour of sleep.
Adult severity categories commonly use these thresholds:
| AHI: events per hour of sleep | Category |
|---|---|
| Fewer than 5 | Below the usual adult AHI threshold for OSA |
| 5 to less than 15 | Mild |
| 15 to less than 30 | Moderate |
| 30 or more | Severe |
The boundaries include decimal results: an AHI of 14.8 falls in the mild range; 15.0 falls in the moderate range. [7]
Some home tests report a respiratory event index, or REI, using monitoring time rather than measured sleep time. That difference can affect interpretation. Your clinician also considers oxygen levels, symptoms, medical history, and other findings; the event count is only part of the picture. [5]
How common is OSA?
OSA is common, although estimates vary with age, population, and how breathing events are measured.
A US study published in 2013 estimated moderate-to-severe sleep-disordered breathing in approximately:
| Group | Estimated prevalence |
|---|---|
| Men ages 30–49 | 10% |
| Men ages 50–70 | 17% |
| Women ages 30–49 | 3% |
| Women ages 50–70 | 9% |
These are historical population estimates, not a current survey or an estimate of any individual’s likelihood of having OSA. [4]
Is obstructive sleep apnea dangerous?
OSA can affect health and safety, especially when severe and untreated. Repeated breathing interruptions and disrupted sleep can contribute to daytime impairment and are linked with cardiovascular health problems. [1] [8]
OSA is particularly common among people who already have conditions such as high blood pressure, heart failure, atrial fibrillation, or stroke. This does not mean that everyone with OSA will develop those conditions. [8]
In an 18-year observational study, severe sleep-disordered breathing was associated with approximately three times the risk of death compared with no sleep-disordered breathing, after adjustment for age, sex, and body mass index. That finding describes an association across a study population; it does not predict an individual’s outcome or establish how much a particular treatment changes that risk. [7]
The practical next step is evaluation and an appropriate treatment plan.
How is OSA treated?
Effective treatments are available. The choice depends on severity, anatomy, other health conditions, preferences, and how consistently a treatment can be used.
- Positive airway pressure, including CPAP: keeps the airway open with air pressure delivered through a mask.
- Custom oral appliance therapy: uses a custom appliance to hold the lower jaw forward during sleep. At RespAir, Dr. DeSaix examines your teeth and jaw, fits the appliance, and manages adjustments. Guidelines support this option for adults with OSA who cannot tolerate CPAP or prefer an alternative, with follow-up testing to assess effectiveness. [10]
- Weight management: can improve OSA in some people and may be part of a broader treatment plan. [11]
- Medication for eligible patients: the FDA approved tirzepatide, sold as Zepbound, for moderate-to-severe OSA in adults with obesity, alongside a reduced-calorie diet and increased physical activity. A medical prescriber determines suitability. [12]
- Position changes, surgery, or implanted devices: may be appropriate for selected patients after evaluation. [11]
Some people need more than one approach. Your care team can explain how treatments fit together and how their effectiveness will be checked.
Explore sleep apnea treatment options, custom oral appliances for sleep apnea, or options when CPAP is difficult.
Do not stop or change prescribed treatment without discussing it with your treating clinician.
Getting evaluated in Raleigh
RespAir Sleep is a dental sleep medicine practice in Raleigh, North Carolina.
If you have not been tested: Write down your symptoms, how long they have been happening, and any breathing changes a bed partner has noticed. Your primary care or sleep clinician can help determine whether testing is appropriate. You can also contact RespAir with questions about getting started.
If you already have a diagnosis: Dr. Ashley DeSaix evaluates dental suitability for an oral appliance and manages oral appliance care. Medical diagnosis and assessment of treatment effectiveness belong with your sleep physician. Oral appliance treatment for OSA requires a physician’s diagnosis and prescription. [13]
Learn about your first visit and insurance and costs.
You do not need to choose a treatment before asking for help.
Common questions
What does OSA stand for in medical terms?
OSA stands for obstructive sleep apnea: repeated narrowing or closure of the upper airway during sleep that reduces or stops airflow. [1]
Is OSA the same as snoring?
Does feeling rested rule out OSA?
No. Daytime sleepiness is only one part of the evaluation. Report witnessed breathing pauses, gasping, or other concerns even if you feel rested. Questionnaires and symptoms alone cannot rule OSA in or out. [5]
Can OSA be cured?
Some people’s OSA improves substantially with treatment or changes such as weight loss. Others need ongoing treatment. Feeling better or snoring less does not establish that OSA has resolved. Ask your treating clinician whether reassessment or follow-up testing is appropriate before changing treatment. [9] [11]
Is this information for children too?
No. This guide explains adult OSA. A child with snoring or breathing concerns needs an age-appropriate evaluation through their pediatric or sleep care team. Adult testing thresholds and treatment pathways should not be applied to children.
Sources
Sources support the explanations above. Publication dates are shown where useful; the source-check date is not a clinical review date.
- NHLBI: What Is Sleep Apnea?
- NHLBI: Sleep Apnea Symptoms
- NHLBI: Causes and Risk Factors
- Peppard et al.: Increased Prevalence of Sleep-Disordered Breathing in Adults, 2013
- AASM: Clinical Practice Guideline for Diagnostic Testing for Adult OSA, 2017
- FDA: Over-the-Counter Devices to Assess the Risk of Sleep Apnea
- Young et al.: Sleep Disordered Breathing and Mortality—Eighteen-Year Follow-up, 2008
- American Heart Association: Obstructive Sleep Apnea and Cardiovascular Disease, 2021
- NHLBI: Living With Sleep Apnea
- AASM/AADSM: Oral Appliance Therapy Clinical Practice Guideline, 2015
- NHLBI: Sleep Apnea Treatment
- FDA: First Medication Approved for OSA, December 2024
- North Carolina Dental Board: Sleep-Related Breathing Disorders Policy, March 2026
About care at RespAir: Dr. DeSaix is a dentist. A sleep physician diagnoses sleep apnea and assesses treatment effectiveness. Dr. DeSaix evaluates dental suitability and manages oral appliance care. Treating OSA with an appliance requires a physician’s diagnosis and prescription.
This guide provides general education for adults. Your medical and dental care teams can explain what applies to your situation.