Obstructive Sleep Apnea

Introduction

Obstructive sleep apnea, often shortened to OSA, is one of the most common long-term breathing disorders. If you have been told you snore loudly, if a partner has seen you stop breathing in your sleep, or if you feel exhausted during the day despite spending enough hours in bed, OSA may be the reason — and it may already be on your doctor’s list of possibilities.

OSA is more than a snoring nuisance. Over time, the repeated drops in oxygen and the fragmented sleep place strain on the heart, blood vessels, brain, and metabolism. The good news is that OSA is highly treatable. With an accurate diagnosis and consistent therapy, most people sleep better, feel better, and lower their long-term health risks.

This guide is written for adults who suspect they have OSA, who are being evaluated for it, or who have already been diagnosed and are now planning the next phase of care. It explains what OSA is, how it is diagnosed, the main treatment options including CPAP, BiPAP, oral appliances, and surgery, and what to expect as you live with the condition long-term. A section on OSA in children is included for parents.

What Is Obstructive Sleep Apnea?

Obstructive sleep apnea is a condition in which the muscles and soft tissues at the back of the throat relax too much during sleep, narrowing or completely blocking the upper airway. Each time this happens, breathing becomes shallow (a hypopnea) or stops entirely for several seconds (an apnea). The body responds with a brief arousal — often too short to remember — that reopens the airway and restarts breathing.

These events can happen anywhere from a few to several hundred times a night. Even when you are not aware of them, they prevent the deep, continuous sleep your body needs to repair itself.

OSA sits within a broader group of sleep-disordered breathing conditions. The other main types are:

• Central sleep apnea, where the brain briefly fails to send the signal to breathe. The airway is open; the drive is missing.
• Mixed or complex sleep apnea, where features of both obstructive and central apnea appear.
• Upper airway resistance syndrome, where increased breathing effort disturbs sleep without meeting the formal threshold for OSA.

This article focuses on obstructive sleep apnea, by far the most common form.

How Severity Is Measured

• Mild OSA: AHI of 5 to less than 15 events per hour
• Moderate OSA: AHI of 15 to less than 30 events per hour
• Severe OSA: AHI of 30 or more events per hour

Doctors also consider oxygen levels during sleep (how low they fall and for how long), symptoms during the day, and the presence of other health conditions such as high blood pressure or heart disease when deciding how aggressively to treat OSA. Two people with the same AHI can have very different clinical pictures, and treatment decisions are made on the whole person, not the number alone.

Causes and Risk Factors

OSA happens because, during sleep, the muscles that normally keep the upper airway open relax. In some people, the airway is already narrowed by anatomy, fat deposits, or swelling, so even normal relaxation is enough to cause collapse.

The most common risk factors include:

• Excess weight and obesity. Fat around the neck and throat narrows the airway. Weight gain is one of the strongest risk factors, and weight loss is one of the few changes that can meaningfully reduce OSA severity.
• Large neck circumference. Often linked to body weight but also to body build.
• Male sex. Men are more often affected, though risk in women rises after menopause.
• Older age. Risk increases through middle age and beyond, though it can plateau in later life.
• Family history. Both genetics and shared anatomy (jaw shape, airway size) play a role.
• Nasal obstruction. Chronic congestion, a deviated septum, or nasal polyps can worsen OSA.
• Enlarged tonsils or adenoids. A major cause in children, and sometimes relevant in adults.
• Jaw and facial structure. A small or set-back lower jaw, a large tongue, or a high arched palate can narrow the airway.
• Alcohol, sedatives, and certain medications. These further relax airway muscles and worsen breathing during sleep.
• Smoking. Causes airway inflammation and is associated with more severe OSA.
• Hypothyroidism and other endocrine conditions. May contribute when present.

Knowing your risk factors helps your doctor decide which investigations to prioritise and which treatments are most likely to help.

Signs and Symptoms

OSA produces symptoms during the night and during the day. Many people are first alerted by a bed partner who notices the nighttime signs.

Nighttime symptoms

• Loud, habitual snoring
• Witnessed pauses in breathing followed by gasping, snorting, or choking
• Restless sleep with frequent movement
• Waking up suddenly short of breath
• Frequent trips to the bathroom at night
• Dry mouth or sore throat in the morning

Daytime symptoms

• Waking up unrefreshed despite a full night in bed
• Morning headaches
• Excessive daytime sleepiness, including falling asleep while reading, watching television, or driving
• Difficulty concentrating, slowed thinking, or memory lapses
• Irritability, low mood, or anxiety
• Reduced sex drive

Not everyone with OSA snores loudly, and not every loud snorer has OSA. Daytime sleepiness can also be subtle — some people adapt to it over years and only realise how tired they were once treatment begins.

Diagnosis

If your doctor suspects OSA, the next step is a structured evaluation. This usually combines a clinical assessment with a sleep study.

Clinical assessment

Your doctor or sleep specialist will ask about:

• Your sleep pattern, bedtime, and total sleep hours
• Snoring, witnessed apneas, and other nighttime symptoms
• Daytime sleepiness, often measured using the Epworth Sleepiness Scale — a short questionnaire that scores how likely you are to doze off in various situations
• Other medical conditions, especially high blood pressure, heart disease, diabetes, stroke, and atrial fibrillation
• Medications, alcohol use, and smoking

A physical examination typically includes measuring your weight, height, and neck circumference, and looking at your nose, mouth, throat, and jaw structure. Questionnaires such as the STOP-BANG may be used to estimate your risk of OSA before testing.

In-laboratory polysomnography

• Breathing pattern at the nose and mouth
• Chest and abdominal movement
• Blood oxygen levels
• Heart rate and rhythm
• Brain activity (EEG), eye movements, and muscle tone to identify sleep stages
• Leg movements
• Sleep position and snoring

From this, the AHI, oxygen desaturation index, and a detailed picture of your sleep are calculated.

Home sleep apnea testing

For many adults with a high pre-test likelihood of moderate to severe OSA and no major heart, lung, or neurological conditions, the AASM supports the use of a home sleep apnea test (HSAT). A smaller, portable device records airflow, breathing effort, oxygen, and heart rate at home. HSAT is more convenient but measures fewer signals than in-lab testing. If results are negative or unclear in someone with strong symptoms, an in-lab study is usually recommended.

Additional tests

Depending on your history, your doctor may also arrange:

• Pulmonary function tests if a lung condition such as asthma or COPD is suspected to coexist
• Echocardiogram or other heart tests if cardiac involvement is a concern
• Thyroid function tests and other blood work where relevant
• ENT examination, sometimes with nasal endoscopy or drug-induced sleep endoscopy, when surgery is being considered

Treatment Options

Treatment depends on the severity of OSA, the symptoms causing the most trouble, the underlying anatomy, and the patient’s preferences. Most people benefit from a combination of approaches rather than a single one.

Positive airway pressure (PAP) therapy

Positive airway pressure therapy is the most studied and most consistently effective treatment for moderate to severe OSA, and it is recommended by the AASM and other major sleep societies as first-line therapy in those groups. A bedside device delivers pressurised air through a mask, acting as a pneumatic splint that keeps the airway open during sleep.

The main forms are:

• CPAP (Continuous Positive Airway Pressure): delivers a single, constant pressure throughout the night. It is the most commonly prescribed form.
• APAP (Auto-titrating PAP): automatically adjusts pressure throughout the night based on what the airway needs at the moment. Useful when pressure requirements vary.
• BiPAP (Bi-level PAP): delivers a higher pressure when you breathe in and a lower pressure when you breathe out. Often used when CPAP is not tolerated, when very high pressures are needed, or when there is coexisting lung disease or central sleep apnea.

The pressure setting is determined either during a sleep laboratory titration study or, increasingly, by an APAP device that records data over several nights at home.

Masks come in several styles — nasal pillows, nasal masks, and full face masks. Finding a mask that fits comfortably and seals well is one of the most important steps to successful long-term use. It is normal to try more than one before settling.

Oral appliances

Custom-made oral appliances, usually mandibular advancement devices, are fitted by a dentist trained in sleep medicine. They hold the lower jaw and tongue forward, enlarging the airway. The AASM considers oral appliances a reasonable first-line option for adults with mild to moderate OSA, and an alternative for those with more severe OSA who cannot tolerate PAP therapy.

Side effects are usually mild and include jaw discomfort, tooth movement over time, and changes in bite. Periodic dental review is part of long-term care.

Positional therapy

In some people, OSA happens mainly or only when sleeping on the back. This is called positional OSA. Strategies that encourage side sleeping — specialised pillows, wearable position monitors, or simple tricks such as a tennis ball sewn into the back of a shirt — can reduce the AHI in these cases. Positional therapy is often combined with other treatments rather than used alone.

Weight loss and lifestyle changes

For adults whose OSA is linked to excess weight, gradual weight loss often reduces severity and sometimes resolves the condition. Even a 5 to 10 percent reduction in body weight can produce a meaningful improvement in AHI. Other helpful changes include avoiding alcohol within several hours of bedtime, stopping smoking, and treating nasal congestion.

For people with significant obesity, bariatric surgery is sometimes considered. While not a treatment for OSA in itself, it can substantially reduce OSA severity in those who lose large amounts of weight.

Surgery

Surgery is generally considered when PAP therapy and oral appliances are not tolerated or not effective, or when a specific anatomical problem is identified. Options include:

• Nasal surgery (septoplasty, turbinate reduction, polyp removal) to improve nasal airflow, which can also make PAP therapy more comfortable.
• Tonsillectomy and adenoidectomy, particularly important in children but sometimes useful in adults with very enlarged tonsils.
• Uvulopalatopharyngoplasty (UPPP) and related soft tissue procedures that remove or remodel tissue at the back of the throat.
• Maxillomandibular advancement, a major jaw surgery that moves the upper and lower jaws forward, enlarging the airway. It has the highest success rates among OSA surgeries but is a significant operation.
• Hypoglossal nerve stimulation, an implanted device that activates the tongue muscles during sleep to keep the airway open. It is available in selected centres for adults with moderate to severe OSA who cannot tolerate PAP and meet specific criteria.

Drug-induced sleep endoscopy, where the airway is examined under sedation, is often used before surgery to identify where the airway collapses.

Medications

There is no medication that reliably cures OSA. Some medications play supporting roles:

• Nasal steroid sprays or decongestants for nasal congestion
• Treatment of acid reflux when it disturbs sleep
• Thyroid hormone replacement when hypothyroidism is present
• Wake-promoting medications (such as modafinil or solriamfetol) prescribed by specialists for residual daytime sleepiness that persists despite well-controlled OSA on PAP therapy

Newer drug treatments aimed directly at OSA are being studied but are not yet standard care.

Living with CPAP and Other Devices

Starting PAP therapy is a significant adjustment. Most people who use it consistently find that, within a few weeks to a few months, they wake feeling more rested and notice clear improvements in daytime function. Studies also show reductions in blood pressure and improvements in mood and concentration in those who use PAP regularly.

Common early challenges include:

• Mask discomfort or air leaks
• Dry nose or mouth, often helped by a heated humidifier
• Nasal congestion
• A sensation of too much pressure, which can sometimes be eased by “ramp” features that start at lower pressure
• Claustrophobia, which often improves with practice and with trying different mask styles
• Disturbance to a partner from device noise — modern machines are usually quiet, but mask leaks can be noisy

If you struggle in the first weeks, it is worth contacting your sleep clinic rather than abandoning the therapy. Mask refitting, pressure adjustment, humidification changes, and education sessions all improve long-term use.

Practical care of the device includes:

• Cleaning the mask and tubing regularly according to the manufacturer’s instructions
• Replacing filters, cushions, and tubing on schedule
• Using distilled water in the humidifier where recommended
• Bringing the device when travelling — most are designed for travel and many can run on battery power

For people using oral appliances, regular dental review ensures the device continues to fit well and that tooth or jaw changes are detected early.

Monitoring and Follow-up

OSA is a chronic condition, and follow-up is part of long-term care. Typical follow-up may include:

• A review within a few weeks of starting treatment to check tolerance, symptom improvement, and device data
• Regular downloads from PAP devices, which record hours of use, mask leak, and residual breathing events
• Periodic clinical review — commonly once a year — to assess symptoms, weight, blood pressure, and the need for any changes
• Repeat sleep studies if symptoms return, after significant weight change, or before and after surgery

If you change treatment (for example, switching from CPAP to an oral appliance, or after weight loss surgery), repeat assessment helps confirm that OSA remains controlled.

Complications of Untreated OSA

• High blood pressure, including hypertension that is difficult to control with medication
• Atrial fibrillation and other heart rhythm problems
• Coronary heart disease and heart failure
• Stroke
• Type 2 diabetes and worsened blood sugar control
• Depression and anxiety
• Cognitive problems and increased risk of motor vehicle and workplace accidents from daytime sleepiness
• Increased risk of complications during surgery and after general anaesthesia

Treatment does not erase these risks instantly, but consistent therapy is associated with better blood pressure control, reduced cardiovascular events, and lower accident rates in many studies.

When to Seek Urgent Care

Most OSA management happens in scheduled clinic visits. However, you should seek prompt medical attention if you develop:

• Severe daytime sleepiness that makes driving or operating machinery unsafe
• Chest pain or pressure
• Sudden, severe shortness of breath
• Episodes of fainting or near-fainting
• Confusion or marked change in mental state on waking
• Worsening leg swelling along with breathlessness

These may signal heart or lung complications that need urgent evaluation.

Obstructive Sleep Apnea in Children

OSA in children differs from OSA in adults in causes, presentation, and treatment.

Causes in children

Enlarged tonsils and adenoids are the most common cause of OSA in children, especially between the ages of about three and eight, when this lymphoid tissue is largest relative to the airway. Other contributors include obesity, allergies and nasal congestion, certain craniofacial syndromes (for example Down syndrome and Pierre Robin sequence), and neuromuscular conditions.

How it shows up

Children with OSA may snore loudly, breathe through the mouth, sweat heavily at night, sleep in unusual positions (such as with the neck extended), wet the bed beyond the usual age, or wake unrefreshed. Daytime symptoms are often different from those in adults — rather than obvious sleepiness, children may show:

• Difficulty concentrating at school
• Behavioural problems, hyperactivity, or irritability
• Poor growth or, conversely, weight gain
• Morning headaches

Diagnosis and treatment in children

Diagnosis is made by a paediatric sleep specialist, usually with a sleep study interpreted using paediatric criteria. The American Academy of Pediatrics recommends evaluation for any child with regular snoring plus other suggestive symptoms.

The most common first treatment is adenotonsillectomy — surgical removal of the tonsils and adenoids — which is curative or near-curative in many children. For children where surgery is not enough, where the cause is not tonsillar, or where surgery is not suitable, other options include:

• CPAP or BiPAP therapy with paediatric masks
• Weight management when relevant
• Treatment of allergies and nasal disease
• Orthodontic approaches such as rapid maxillary expansion in selected children

Untreated OSA in children can affect growth, learning, behaviour, and long-term cardiovascular health, so timely evaluation matters.

Practical Tips for Better Sleep with OSA

Alongside medical treatment, daily habits make a real difference:

• Keep a regular sleep schedule, going to bed and waking at similar times each day
• Aim for adequate total sleep time — most adults need seven to nine hours
• Avoid alcohol in the hours before bed
• Avoid heavy meals close to bedtime
• Be cautious with sleeping tablets and sedatives, which can worsen OSA
• Manage nasal congestion actively, especially if you use PAP therapy
• Exercise regularly, which improves both sleep quality and overall health
• Tell any doctor or surgeon treating you that you have OSA, particularly before procedures involving sedation or general anaesthesia

Frequently Asked Questions

Will I need to use CPAP for the rest of my life?

OSA is usually a long-term condition, and for most adults, treatment is ongoing. That said, some people are able to stop or reduce PAP therapy after substantial weight loss, successful surgery, or other significant changes — ideally confirmed with a repeat sleep study. The decision is made with your sleep specialist, not by stopping the device on your own.

If I lose weight, will my OSA go away?

Weight loss often reduces OSA severity and sometimes resolves it, especially in people whose OSA is closely linked to excess weight. However, OSA can persist even after meaningful weight loss because anatomy, age, and other factors also matter. A repeat assessment is the best way to know where you stand.

Can I drink alcohol if I have OSA?

Alcohol relaxes the airway muscles and worsens OSA, particularly in the hours before bed. Most sleep specialists advise limiting alcohol, especially in the evening, and avoiding it altogether on nights when you do not use your PAP device.

Is snoring without daytime sleepiness still a problem?

Loud habitual snoring with witnessed apneas can indicate OSA even in people who do not feel sleepy. Some people adapt to chronic sleep disturbance and do not perceive it. If a partner has noticed pauses in breathing or gasping, evaluation is worth pursuing regardless of how you feel during the day.

Can OSA affect driving?

Yes. Untreated OSA increases the risk of motor vehicle accidents. Many regions have rules about driving with untreated moderate to severe OSA, particularly for professional drivers. Your sleep specialist can advise based on local guidance.

What if I cannot tolerate CPAP?

Difficulties with CPAP are common in the first weeks. Mask refitting, pressure adjustment, humidification, treating nasal problems, and education often solve the issue. If CPAP truly does not work, alternatives include APAP, BiPAP, oral appliances, positional therapy, weight loss, surgery, and in selected cases hypoglossal nerve stimulation. The choice depends on severity, anatomy, and other health factors.

Does OSA increase risk during surgery?

Yes. OSA can increase the risk of breathing problems during and after operations that involve sedation or general anaesthesia. Tell your surgeon and anaesthetist that you have OSA, and bring your PAP device with you to hospital if you use one.

Who treats OSA?

OSA is most often managed by pulmonologists or sleep medicine physicians. ENT (ear, nose, and throat) specialists are involved when surgery is considered. Dentists trained in sleep medicine fit oral appliances. Many patients are cared for by a team rather than a single doctor.

Conclusion

Obstructive sleep apnea is common, often under-recognised, and meaningfully linked to long-term health. It is also one of the most treatable chronic conditions in adult medicine. A clear diagnosis through a sleep study, a treatment plan matched to your severity and anatomy, and consistent follow-up can transform daytime energy, mood, and concentration, and lower the strain that untreated OSA places on the heart, brain, and metabolism.

Whether your path involves PAP therapy, an oral appliance, weight loss, surgery, or a combination, the most important steps are getting an accurate evaluation, finding a treatment you can use night after night, and staying in touch with the team looking after you over time.