- A deviated septum (a misaligned nasal wall) is more common than most people realise, affecting around 30% of the population.
- It can restrict airflow through one or both nasal passages, which may lead to mouth breathing, snoring, and disrupted sleep.
- A deviated septum is not the same as sleep apnoea (a condition involving repeated breathing pauses during sleep), though the two can co-exist.
- Septoplasty (surgery to straighten the septum) may be considered when symptoms do not respond to medical management.
Many people who have a deviated nasal septum do not know it. The deviation may be mild enough to go unnoticed during the day, but significant enough to restrict airflow at night, causing you to snore and disrupting your sleep.
In this article, we explain what a deviated septum is, how it contributes to snoring and poor sleep, and when surgery may be worth considering.
What Is A Deviated Nasal Septum?
The nasal septum is the wall of cartilage and bone that divides your nose into a left and a right passage. When the deviation is significant enough to narrow one or both passages, it can affect the way you breathe.
Nasal Septum Structure Explained
Your nasal septum runs from the base of your nose to the back of your nasal cavity, made up of cartilage at the front and bone at the back, both covered by the mucosa (the moist lining of the nasal passages). In a straightforward anatomy, it sits centrally and allows equal airflow through both sides.
When The Septum Is Not Centered
A deviated septum occurs when the thin wall dividing the two nasal passages is displaced to one side. It may be present from birth, develop after a nose injury, or become more noticeable over time.
How Does A Deviated Nasal Septum Affect Breathing?
- A deviated septum does not always cause obvious symptoms during the day. Breathing restriction may become noticeable in these situations:
One Side May Feel More Blocked
The most common day-to-day symptom is a persistent feeling that one nostril is partially blocked.
This is partly due to the nasal cycle (the natural process by which each side alternates between congestion and clearance every few hours). If your septum is already narrowing one passage, the congested phase can make that side feel almost completely blocked.
Reduced Airflow Through The Nose
When nasal airflow is reduced, your body compensates by breathing through your mouth. This has been shown to impair sleep quality and cognitive functioning in people with structural nasal issues.
Worse Congestion During Illness Or Allergies
If your nasal airflow is already restricted, even mild swelling from a cold, sinus infection, or allergies can significantly worsen the blockage. What feels like minor congestion for most people may leave you struggling to breathe through your nose.
Why Do Symptoms Feel Worse At Night?
Many people with a deviated septum notice their symptoms during the day are manageable, but bedtime is a different story.
Lying Down Increases Nasal Congestion
When you are upright, gravity assists drainage from the nasal tissues. Lying flat allows fluid to pool in the nasal lining and soft tissue to swell, which is why a septum that allows reasonable airflow during the day can feel like a near-complete obstruction at night.
Breathing Becomes More Noticeable At Rest
Breathing tends to feel more noticeable at rest. During the day, movement and distractions often mask mild airflow limitations.
At night, when the body is still and attention shifts to each breath, even partial nasal obstruction can become more apparent and harder to ignore.
Night-Time Airflow Limitation Feels Stronger
Positional swelling and the natural nasal cycle can make a narrowed nasal passage feel more congested at night. When enlarged turbinates are also present, the combined effect can further reduce airflow, making nasal blockage more noticeable when lying down.
Waking up tired with a blocked nose most mornings? At The Rhinoplasty Clinic, we can assess whether a structural issue is behind your symptoms. Book a consultation today.
Can A Deviated Septum Make You Snore?
Here’s how a deviated septum often leads to snoring and poor sleep.
Increased Mouth Breathing During Sleep
Mouth breathing during sleep bypasses the nose entirely, meaning the air reaching your airway is less filtered, less warm, and less humid. This changes the dynamics of airflow through your upper airway in ways that can trigger or worsen snoring.
Airflow Vibration Causing Snoring
Snoring occurs when airflow causes the soft tissues of the throat and palate to vibrate. When you breathe through your mouth during sleep, these tissues are more prone to vibration.
A deviated nasal septum does not directly cause snoring, but the mouth breathing it encourages frequently does.
Dry Mouth And Poor Sleep Quality
Mouth breathing during sleep draws moisture from your mouth and throat, commonly producing a dry mouth or sore throat on waking. It also pushes you toward lighter, more fragmented sleep rather than the deeper stages your body needs.
Is It Deviated Septum Or Sleep Apnoea?
A deviated septum and obstructive sleep apnoea (OSA) are related but distinct conditions, and it is worth understanding the difference.
| Deviated Septum | Obstructive Sleep Apnoea (OSA) | |
| Snoring pattern | Continuous, linked to mouth breathing | Often loud with gasping or pauses |
| Breathing interruptions | No | Yes — airway collapses repeatedly during sleep |
| Daytime fatigue | Possible if sleep quality is poor | Common, often disproportionate to hours slept |
| Diagnosis | Clinical nasal assessment | Sleep study (polysomnography) required |
When Both Conditions Co-Exist
Both can co-exist, and nasal obstruction may worsen OSA by increasing breathing effort during sleep. Addressing structural nasal obstruction can be part of a broader treatment plan, though a sleep study should be completed if OSA is suspected.
Not sure whether your symptoms point to a structural nasal issue or something more? Speak with Dr Tan Kar Su at The Rhinoplasty Clinic for a thorough nasal assessment.
When Septoplasty May Be Considered
For many people, a deviated septum can be managed with nasal steroid sprays, antihistamines, or saline rinses. When these measures are insufficient, septoplasty (surgical correction of the septum) may be appropriate.
Septoplasty addresses the septum internally, while functional rhinoplasty covers a broader range of structural nasal issues that may also affect breathing. Your surgeon will advise which is appropriate based on your anatomy.
Septoplasty may be worth discussing with a specialist if any of the following apply:
- Nasal congestion persists despite consistent use of steroid sprays or antihistamines
- You have a confirmed deviated septum on clinical assessment
- Your snoring or mouth breathing is linked to nasal obstruction
- Sleep disruption is affecting your daily functioning
Book a Consultation at The Rhinoplasty Clinic
If you suspect a structural nasal cause behind your snoring or poor sleep, a thorough assessment is the logical first step.
At The Rhinoplasty Clinic, Dr Tan Kar Su will examine your nasal anatomy and discuss whether septoplasty or functional rhinoplasty may help.
Frequently Asked Questions
Can A Deviated Nasal Septum Get Worse Over Time?
Will Surgery Completely Stop Snoring?
Is Septoplasty A Functional Or Cosmetic Procedure?
Septoplasty addresses the internal alignment of the septum to improve airflow and is not performed for aesthetic reasons. If you have both functional and cosmetic concerns, a combined procedure may be discussed as an option.
How Long Is Recovery After Septoplasty?
Most patients return to light daily activities within one to two weeks. Internal swelling typically settles over four to six weeks, with full improvement in breathing usually felt by six to 12 weeks. Your surgeon will provide specific post-operative guidance based on your procedure.
Can A Deviated Septum Cause Daytime Fatigue?
It can contribute to it. If nasal obstruction is disrupting your sleep at night, the resulting fatigue during the day is a predictable consequence.
Untreated nasal obstruction has been linked to sleep-disordered breathing, behavioural issues, and cognitive decline, particularly when left unaddressed over a long period.
Do All Deviated Septums Need Surgery?
No. Many people have a degree of septal deviation that causes few or no symptoms. Surgery is considered only when symptoms are persistent, significant, and have not responded to medical management.
Choosing a Surgeon for Septorhinoplasty in Singapore
With septorhinoplasty, it is crucial to consult a surgeon experienced in both the functional and aesthetic aspects of the nose, particularly for Asian facial features.
At The Rhinoplasty Clinic in Singapore, Dr. Tan Kar Su oversees your care, drawing on training from his time at a rhinoplasty centre in Gangnam, Seoul, and experience treating both Asian and international patients.
We offer:
- Customised care plans – designed around your facial proportions and personal goals
- Comprehensive support – from initial assessment to post-procedure recovery, as well as advice on costs for rhinoplasty procedures in Singapore
- Balanced outcomes – enhancing appearance while maintaining or improving nasal function
