Can a Deviated Septum Cause Chronic Nasal Blockage?
Dr Valerie Tay
Senior Consultant ENT Surgeon
MBBS (Singapore), MRCS (Edinburgh), MMed (ORL), FAMS
Persistent nasal blockage is not always caused by allergies or sinus infections. In some cases, the cause lies in the structure of the nose itself. A deviated nasal septum, where the wall separating the two nasal passages is displaced to one side, can restrict airflow and lead to chronic nasal congestion. Understanding what a deviated septum is and how it affects breathing is the first step in determining whether it may be contributing to chronic nasal blockage.
What Is a Deviated Nasal Septum?
The nasal septum is the wall of cartilage and bone that separates the nose into two nasal passages. When this wall is off-centre or crooked, it is referred to as a deviated nasal septum, which can make one nasal airway narrower than the other. A deviated septum may occur due to:
Congenital factors (present at birth)
Trauma or injury, such as sports impacts, falls or accidents
Minor childhood injuries that become more noticeable over time
When the septum is significantly deviated, it can restrict airflow and cause persistent nasal blockage. Symptoms may worsen during colds or allergy flare-ups and surrounding structures such as the turbinates may enlarge to compensate, further narrowing the airway.
How a Deviated Septum Causes Chronic Nasal Blockage
A deviated nasal septum can cause persistent nasal blockage by narrowing one side of the nasal passage, making it harder for air to flow smoothly through the nose. When the septum is significantly off-centre, breathing may feel persistently restricted, especially on one side.
In many cases, symptoms worsen when the nasal lining becomes inflamed, such as during a cold, a sinus infection or an allergy flare-up. This swelling further reduces the already limited space in the nasal airway, leading to a blocked or congested sensation that may not fully improve with standard medications.
Over time, this imbalance in airflow may also cause other structures inside the nose, such as the turbinates, to enlarge and contribute to further obstruction.
Common Symptoms and Complications of a Deviated Septum
Not everyone with a deviated septum experiences symptoms. However, when the deviation is significant, it may lead to persistent or recurrent issues such as:
Chronic nasal blockage, often worse on one side
Difficulty breathing through the nose, especially during sleep
Mouth breathing, leading to dry mouth or sore throat
Snoring or disturbed sleep
Recurrent sinus infections due to impaired sinus drainage
Frequent nosebleeds, particularly on the narrower side
Reduced sense of smell
If left untreated, a significantly deviated septum may contribute to:
Ongoing sinus inflammation (chronic sinusitis)
Poor sleep quality and daytime fatigue
Worsening snoring or sleep-related breathing issues
Persistent facial pressure or sinus discomfort
How ENT Specialists Diagnose a Deviated Septum
Diagnosis begins with a review of your symptoms, including how long the nasal blockage has been present and whether it affects one or both sides. Your ENT specialist will also ask about related symptoms such as snoring, recurrent sinus infections, facial pressure or sleep disturbance.
A physical examination of the nose is performed to assess the septum and check for obstruction. In many cases, a nasoendoscopy (a thin, flexible camera) is used to examine the nasal passages more closely and identify contributing factors such as turbinate enlargement, polyps or inflammation.
If chronic sinus problems are suspected, a CT scan of the sinuses may be recommended. A thorough assessment helps confirm whether the deviated septum is the main cause of long-term nasal blockage and guides appropriate treatment.
Treatment Options for a Deviated Septum
Treatment depends on how severe the deviation is and how much it affects breathing and quality of life.
Non-surgical Management
For mild symptoms, conservative treatment may help relieve inflammation and improve airflow:
Nasal steroid sprays to reduce swelling
Saline rinses to clear mucus and irritants
Allergy treatment, if allergic rhinitis is contributing
These treatments can reduce symptoms but do not correct the structural deviation itself.
Surgical Treatment: Septoplasty or Septorhinoplasty
When nasal blockage is persistent and significantly affects breathing or sleep, septoplasty may be recommended. Septoplasty is a surgical procedure that straightens the nasal septum to improve airflow through the nose. In some cases, septoplasty may be combined with turbinate reduction if enlarged turbinates are also contributing to obstruction.
In more complex cases of a deviated nasal septum, especially when there is significant external nasal deformity or prior injury, septorhinoplasty may be recommended.
This procedure combines septoplasty with rhinoplasty techniques to not only correct the internal septal deviation, but also reshape and support the external nasal structure. Septorhinoplasty can improve both nasal function and appearance, and is often performed when structural abnormalities affect airflow as well as the overall shape of the nose.
When to Seek ENT Evaluation for Persistent Nasal Blockage
If nasal blockage persists despite medication or keeps recurring, it may be time to consider a structural cause such as a deviated septum. Ongoing symptoms like one-sided congestion, mouth breathing, snoring or repeated sinus infections should not be ignored. An ENT assessment can determine whether septal deviation is contributing to your breathing difficulties and whether treatment is needed.
At Aspire Ear, Nose, Throat and Snoring Clinic, persistent nasal blockage is thoroughly assessed to determine whether a deviated septum is the cause. Led by Dr Valerie Tay, the clinic offers personalised treatment plans designed to improve breathing and nasal comfort. If long-term congestion is affecting your daily life or sleep, an ENT consultation can provide clarity and effective management options.
Frequently Asked Questions About Deviated Nasal Septum
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Yes. A mildly deviated septum is very common and many people may not notice symptoms. It becomes a concern only when it causes persistent nasal blockage or related complications.
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Allergies often cause congestion on both sides and may come with sneezing, itchiness or runny nose. A deviated septum more commonly causes persistent one-sided blockage, especially if symptoms remain even when allergy treatment is used.
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The deviation itself usually does not worsen, but symptoms may become more noticeable over time due to ageing, inflammation, recurrent sinus issues or turbinate enlargement.
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No. Septoplasty improves airflow but does not treat allergies. However, better nasal airflow may help allergy medications work more effectively.
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Most patients recover within 1 to 2 weeks, although mild swelling and nasal sensitivity may take longer to settle fully. Your ENT specialist will provide personalised guidance based on the procedure performed.
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Yes. Some children are born with septal deviation, while others develop it after nasal injury. However, treatment decisions in children are made carefully based on severity and symptoms.
Meet Our Specialist
Dr Valerie Tay
Senior Consultant ENT Surgeon
MBBS (Singapore), MRCS (Edinburgh), MMed (ORL), FAMS
Dr Valerie Tay provides comprehensive ENT assessment and treatment for ear, nose, throat and snoring-related conditions. With advanced fellowship training in Facial Plastic Surgery in Seoul, she integrates both functional and aesthetic principles to achieve optimal outcomes in nasal and facial procedures. She is known for her meticulous surgical precision, strong clinical judgement, and patient-centred approach grounded in integrity and compassion. A former President of the Society of Otolaryngology Head and Neck Surgery, Singapore, Dr Tay remains deeply committed to advancing patient care and mentoring future generations of doctors.