Snoring and Sleep Apnoea: When to Worry, What to Expect, and How ENT Assessment Helps

By Dr Vyas M.N. Prasad, FRCS (ORL-HNS) Consultant Otolaryngologist & Head and Neck Surgeon — Absolute ENT, Camden Medical Centre, Singapore

Snoring is extremely common, but it is not always harmless. When snoring is accompanied by pauses in breathing, unrefreshing sleep, or significant daytime fatigue, it may indicate obstructive sleep apnoea — a condition where the upper airway repeatedly collapses during sleep, reducing blood oxygen and placing long-term strain on the cardiovascular system. ENT assessment identifies where and why the airway is obstructing, and guides treatment that is matched to the underlying anatomy rather than applied generically.

• Snoring is common and often harmless, but loud, frequent snoring with gasping or witnessed pauses in breathing points to obstructive sleep apnoea (OSA)

• OSA is associated with serious health consequences including hypertension, heart disease, and stroke if untreated

• Diagnosis requires a sleep study; treatment options range from lifestyle changes and CPAP to surgery

• An ENT assessment is the first step to identifying whether the airway has a structural cause

I was recently interviewed on OneFM about snoring and sleep apnoea — what it actually is, why it matters, and what patients can do about it. You can listen to the full interview here:

Dr Vyas Prasad on OneFM — Snoring and Sleep Apnoea

Dr Vyas Prasad speaking on OneFM Nights with Simon Lim about when snoring becomes a medical concern and what patients in Singapore can do about it.

I also wrote about this topic for the Business Times, which you can read here.

What came through clearly in both conversations was how often sleep apnoea goes unrecognised — by patients who attribute their fatigue to age or a busy life, by partners who assume snoring is just a nuisance, and sometimes by clinicians who focus on the snoring rather than the sleep-disordered breathing behind it.

This post sets out what I think every patient with a snoring problem — or a partner who snores — should understand.

Snoring Versus Sleep Apnoea — The Distinction That Matters

Snoring is a sound. It is produced when airflow through a partially narrowed upper airway causes soft tissues — the soft palate, uvula, tonsillar pillars, tongue base — to vibrate. In simple snoring, the airway narrows but does not close. Air moves through continuously. There is noise, but there is no meaningful disruption to breathing or oxygen levels.

Obstructive sleep apnoea (OSA) is different in kind, not just degree. In OSA, the airway does not merely narrow — it collapses. Breathing stops entirely. This is an apnoea — a pause in breathing that lasts at least ten seconds. The brain registers the drop in oxygen, triggers a partial arousal, and the patient gasps, snorts, or shifts position enough to reopen the airway. This cycle can repeat dozens or even hundreds of times per night. The patient rarely awakens fully and usually has no memory of it — but the cumulative effect on sleep architecture, oxygenation, and cardiovascular load is significant.

The critical point for patients is this: you cannot reliably distinguish simple snoring from sleep apnoea based on how you feel or what you hear. A sleep study — and clinical assessment of your airway anatomy — is what separates them.

Why Sleep Apnoea Is Not Just a Sleep Problem

Untreated moderate to severe OSA carries real health consequences beyond poor sleep:

Cardiovascular risk. The repeated oxygen desaturations and sleep fragmentation of OSA activate the sympathetic nervous system, raise blood pressure, and are independently associated with increased risk of hypertension, atrial fibrillation, heart failure, and stroke. This is not a theoretical concern — it is well-established in large longitudinal studies.

Metabolic effects. Sleep apnoea is associated with insulin resistance and is more common in patients with type 2 diabetes. The relationship is bidirectional — poor metabolic control worsens OSA, and OSA complicates metabolic management.

Cognitive and mood effects. Fragmented sleep impairs memory consolidation, concentration, and executive function. Patients often describe a persistent mental fog that they have normalised over years. Depression and anxiety are more prevalent in untreated OSA.

Driving safety. Excessive daytime sleepiness from OSA significantly increases the risk of road traffic accidents. In Singapore, this has medicolegal implications for patients who drive professionally.

Relationship impact. The partner of a person with severe OSA frequently suffers their own sleep deprivation and may eventually sleep in a separate room. This is a quality-of-life issue that rarely gets surfaced in clinical consultations but matters enormously to the patients I see.

What Causes the Airway to Obstruct?

OSA is not a single anatomical problem — it is the result of one or more structural factors that narrow or destabilise the upper airway during sleep, when muscle tone falls. Understanding the specific cause in each patient is the basis of effective treatment.

Nasal obstruction — a deviated nasal septum, turbinate hypertrophy, or nasal polyps force mouth breathing during sleep, which changes the mechanics of airflow and worsens airway instability. Correcting nasal obstruction alone does not always cure OSA, but it significantly improves it and is often a necessary part of any treatment plan.

Enlarged tonsils — particularly relevant in younger patients and in children, where tonsillar hypertrophy can be the dominant cause of airway obstruction during sleep.

Soft palate and uvula — a long or bulky soft palate narrows the pharynx and is a common site of vibration in snoring and collapse in OSA.

Tongue base — a large or posteriorly positioned tongue can fall back during sleep and partially obstruct the oropharynx. This is one of the more difficult anatomical causes to treat and often requires targeted tongue base procedures or positional strategies.

Neck circumference and body weight — excess adipose tissue around the neck increases the load on the airway and reduces the space available. Weight loss is one of the most effective interventions for OSA in patients who are overweight, though it is rarely sufficient as a standalone treatment in moderate to severe cases.

Skeletal factors — a retrognathic mandible (recessed jaw) reduces the bony frame supporting the upper airway. This is an important consideration in younger patients without obesity who nonetheless have significant OSA.

Recognising the Signs — in Yourself and Others

Many patients with sleep apnoea do not know they have it. They have adapted to a lower level of daily function and attributed it to age, work stress, or simply "not being a morning person." Some presenting features to be aware of:

Witnessed apnoeas — a partner observing you stop breathing, gasp, or choke during sleep is the most specific symptom of OSA. If this has been noticed, assessment should not be delayed.

Unrefreshing sleep — waking after a full night's sleep and not feeling rested. The quantity of sleep is adequate; the quality has been destroyed by repeated arousals.

Excessive daytime sleepiness — dozing off during meetings, while reading, or in passive situations. More severe cases involve sleepiness while driving.

Morning headaches — caused by overnight hypoxia and hypercapnia (elevated CO₂), which produce cerebral vasodilation.

Frequent nocturnal urination — a less well-known symptom. The negative intrathoracic pressure generated during apnoeic episodes increases atrial natriuretic peptide release, which promotes urine production. Patients who wake two or more times per night to urinate should have OSA excluded.

Mood changes and cognitive symptoms — irritability, low mood, and difficulty concentrating that have no obvious explanation.

Assessment — What Happens at a Specialist Appointment

When I see a patient for snoring or suspected sleep apnoea, I do not begin by prescribing a CPAP machine or recommending surgery. I begin by trying to understand the anatomy and the severity of the problem.

Clinical history — the duration and pattern of snoring, witnessed apnoeas, daytime symptoms, alcohol use, medications, and the patient's partner's observations all inform the assessment.

Airway examination — a structured examination of the nose, oral cavity, palate, uvula, tonsils, tongue base, and neck. This identifies the likely sites of obstruction and helps determine whether anatomical correction is likely to help.

Nasal endoscopy — a flexible endoscope passed through the nose provides direct visualisation of the nasal passages, nasopharynx, and hypopharynx. It is brief and well-tolerated.

Sleep study — formal objective measurement of breathing events, oxygen saturation, airflow, and sleep stages during an actual night of sleep. This is the only way to confirm OSA, grade its severity (mild, moderate, severe), and measure the degree of nocturnal hypoxia. Home-based sleep studies are appropriate for most patients; an in-laboratory polysomnogram is reserved for more complex cases.

The sleep study result — specifically the Apnoea-Hypopnoea Index (AHI), which counts breathing events per hour — drives treatment decisions alongside the anatomical findings.

Treatment — Matched to the Cause

There is no single treatment for sleep apnoea. The right approach depends on the severity of OSA, the anatomical findings, the patient's preferences, and comorbidities. I discuss all relevant options before any decision is made.

Lifestyle measures — for mild OSA, positional therapy (avoiding supine sleep), weight loss, and reducing alcohol in the evening can produce meaningful improvement. These are always discussed but are rarely sufficient alone in moderate to severe disease.

CPAP therapy — Continuous Positive Airway Pressure is the most well-established treatment for moderate to severe OSA. A device delivers pressurised air through a mask during sleep, acting as a pneumatic splint to keep the airway open. It is highly effective when used consistently. Tolerance and compliance vary — some patients adapt quickly, others struggle. Modern CPAP machines are quieter and more comfortable than older devices, and there are now multiple mask options.

Mandibular Advancement Device (MAD) — a custom dental appliance worn during sleep that repositions the lower jaw slightly forward, tensioning the airway and reducing collapse. Suitable for mild to moderate OSA or for patients who cannot tolerate CPAP. Less effective in severe OSA.

Targeted surgical treatment — where there is a clear anatomical cause, surgery can produce lasting improvement without the need for a nightly device. Procedures are specific to the site of obstruction and may include septoplasty and turbinate reduction for nasal obstruction, tonsillectomy where tonsillar hypertrophy is the dominant cause, palate surgery (uvulopalatopharyngoplasty or a modified variant) for soft palate collapse, or tongue base procedures where posterior tongue obstruction is identified. Surgery is not suitable for every patient and is not offered as a first resort — but for carefully selected patients with the right anatomy, surgical results can be transformative.

A Note on What I Discussed on Air

In the OneFM interview, I was asked what surprises patients most when they come in for assessment. My answer was that most patients expect either to be told they're fine or to be immediately offered a CPAP machine. What surprises them is the level of anatomical detail involved — that there are specific identifiable reasons why their airway is collapsing, and that treatment can be matched to those reasons.

The other thing that comes up consistently is how long people wait before seeking assessment. The average patient I see has been snoring — and their partner has been suffering — for years before they come in. Sleep apnoea is not a condition where watchful waiting is benign. Earlier assessment, earlier diagnosis, and earlier treatment protects both sleep quality and long-term health.

Frequently Asked Questions

What is the difference between snoring and sleep apnoea? Snoring is the sound produced by airflow vibrating the soft tissues of a partially narrowed upper airway. Sleep apnoea occurs when the airway collapses completely, causing breathing to stop repeatedly during sleep. Snoring is one of the most common symptoms of sleep apnoea, but not everyone who snores has OSA. A sleep study is required to distinguish between them.

How is sleep apnoea diagnosed? Diagnosis requires a sleep study that measures breathing events, oxygen levels, airflow, and sleep stages during an actual night of sleep. This can usually be done at home with a portable device. The key metric is the Apnoea-Hypopnoea Index (AHI) — the number of breathing events per hour. Clinical ENT assessment to evaluate airway anatomy is done alongside the sleep study to guide treatment planning.

Can sleep apnoea be treated without surgery? Yes, for many patients. CPAP therapy, a mandibular advancement device, and lifestyle measures are all non-surgical options and are highly effective. Surgery is only recommended where there is a specific anatomical cause that a targeted procedure can address and where the patient is a suitable candidate. Non-surgical options are always discussed first.

Is snoring dangerous if I feel fine during the day? Not necessarily — but it warrants assessment. Many patients with moderate OSA have adapted to a lower baseline of alertness and do not recognise it as abnormal. Feeling fine is not the same as sleeping well. A consultation can determine whether a sleep study is indicated.

How long does recovery take after airway surgery? It depends on the procedure. Nasal surgery typically involves one to two weeks of congestion and reduced physical activity. Palate or throat surgery involves seven to ten days of throat discomfort and a soft diet. Specific recovery guidance is provided before any procedure is undertaken.

Is sleep apnoea dangerous if left untreated? Moderate to severe OSA that is untreated over years is associated with hypertension, cardiovascular disease, increased stroke risk, metabolic dysfunction, and impaired cognitive performance. It also significantly affects quality of life and — in patients who drive — road safety. Early assessment and appropriate treatment is strongly advisable.

My partner snores but refuses to see a doctor. What can I do? This is one of the most common situations I hear about. The most useful information to share is that sleep apnoea is a medical condition with real health consequences, not just a social nuisance — and that assessment is straightforward, non-invasive in the first instance, and may reveal something very treatable. Sometimes an appointment booked on their behalf, with their agreement, is the simplest way forward.

What should I do if I think I have sleep apnoea? Book a specialist ENT assessment. Bring your partner if they have observed your breathing during sleep — their account is genuinely useful clinically. Come prepared to describe your symptoms, your sleep patterns, and how you feel during the day. From there, the assessment will guide next steps.

Book an Assessment at Absolute ENT, Singapore

If you or your partner are concerned about snoring or sleep apnoea, specialist ENT assessment is the right next step. A thorough clinical evaluation identifies the underlying cause, determines whether a sleep study is needed, and allows a personalised treatment plan to be developed around your anatomy and circumstances.

Dr Vyas Prasad sees patients at Absolute ENT, Camden Medical Centre, 1 Orchard Boulevard, #09-08, Singapore. Contact the clinic by WhatsApp on +65 8060 8079 or by email at camden.mmc@gmail.com.