Obstructive Sleep Apnea: Causes, Symptoms, Risk Factors & Treatment

Obstructive sleep apnea (OSA) is the most common form of sleep apnea, affecting a significant share of adults worldwide — many of whom don't realise they have it. If you've been searching for answers about loud snoring, gasping awake at night, or exhaustion that never seems to lift, this guide covers what OSA actually is, why it happens, how doctors measure its severity, and what treatment looks like.

For a broader introduction to sleep apnea in general, see our guide on what sleep apnea is. This article goes deeper specifically into the obstructive type.

What Happens During Obstructive Sleep Apnea

OSA occurs when the soft tissue at the back of the throat relaxes enough during sleep to partially or fully block the airway. Unlike central sleep apnea, where the brain fails to send the signal to breathe, the airway itself is the problem in OSA — it physically narrows or collapses, cutting off or reducing airflow.

This blockage can happen repeatedly throughout the night, sometimes dozens or hundreds of times, each time briefly waking the brain just enough to reopen the airway and resume breathing — usually without the person remembering it the next morning.

What Causes the Airway to Collapse?

Two things typically combine to cause OSA:

• Natural muscle relaxation during sleep — normal and healthy, but a problem if the airway is already narrow to begin with
• Weakened or fatigued throat muscles — often linked to factors like ageing, excess tissue around the neck, or structural traits that make the airway more prone to collapsing

When both factors are present, the airway is far more likely to narrow or close during sleep, triggering the breathing interruptions that define OSA.

Symptoms of Obstructive Sleep Apnea

OSA symptoms show up both during sleep and throughout the day:

• Loud, chronic snoring
• Brief pauses in breathing, often noticed by a partner
• Waking up gasping or choking for air
• Excessive daytime sleepiness despite a full night in bed
• Difficulty staying asleep through the night
• Dry mouth or sore throat on waking
• Morning headaches
• Trouble concentrating or memory lapses
• Mood changes or irritability

How Doctors Measure OSA Severity

Once diagnosed through a sleep study, your severity is classified using the Apnea-Hypopnea Index (AHI) — the average number of breathing interruptions per hour of sleep:

• Mild: 5–14 events per hour
• Moderate: 15–29 events per hour
• Severe: 30 or more events per hour

Symptoms tend to overlap across all three levels — the difference is largely in how often they occur and how much they affect daily functioning. Severity is one of the key factors your doctor uses to decide on the right treatment.

Risk Factors for Obstructive Sleep Apnea

Some risk factors are lifestyle-related and can be changed; others can't. Known contributors include:

• Being overweight, particularly with extra tissue around the neck
• Being male — men are diagnosed with OSA more often, and tend to have more severe cases
• Being over 40, as muscle tone throughout the body — including the airway — naturally declines with age
• A larger neck circumference
• Taking sedatives, which relax throat muscles further
• Structural traits such as a naturally narrow airway, large tonsils, or a larger tongue
• Regular alcohol use, which increases both the likelihood and severity of episodes
• Smoking, which increases airway inflammation
• Menopause, due to related hormonal changes
• A family history of OSA
• Chronic nasal congestion or allergies

Health Risks of Untreated OSA

Left untreated, OSA is linked to more than just poor sleep. Research associates it with a higher risk of:

• High blood pressure
• Heart disease
• Stroke
• Type 2 diabetes
• Depression and mood changes
• Weight gain, partly through effects on metabolism and hunger hormones

None of this is meant to alarm you — it's simply why getting evaluated sooner, rather than waiting it out, tends to make a real difference.

Treatment Options for Obstructive Sleep Apnea

Treatment depends on your severity and your doctor's recommendation. The most effective and widely prescribed treatment for moderate-to-severe OSA is positive airway pressure therapy — a machine that keeps the airway open with a steady flow of air. We've covered the different types in detail in our CPAP, APAP & BiPAP comparison guide, and our guide to choosing the right machine if you're ready to look at options. You can browse our full range of CPAP machines, APAP machines, and BiPAP machines directly. Beyond machines, your doctor may also recommend lifestyle changes, positional therapy (avoiding sleeping on your back), or in select cases, an oral appliance or surgical option — usually considered when CPAP therapy alone isn't a good fit.

Reducing Your Risk of Obstructive Sleep Apnea

• Maintain a healthy weight
• Stay physically active
• Avoid or quit smoking
• Limit alcohol, especially close to bedtime
• Treat nasal congestion or allergies affecting your breathing at night
• Sleep on your side rather than your back

Getting Diagnosed and Treated in the UAE

If several of these symptoms sound familiar, the first step is talking to your doctor about a sleep study. Options range from an in-lab test to a home sleep apnea test like the WatchPAT One, which you can use overnight in your own bed.

Once you have a diagnosis, our team at CPAP Medical Trading in Business Bay, Dubai can help you find the right machine and mask for your prescription. You're welcome to upload your prescription when ordering, or book a free consultation if you'd like guidance first. You can also reach us directly through our contact page or WhatsApp.

— The CPAP Med Trade Team