Does one nostril feel blocked even when the other allows you to breathe normally? Occasional changes in nasal airflow are common, but persistent blockage on one side of the nose may indicate an underlying condition.

One-sided nasal blockage can develop because of structural differences inside the nose, inflammation, nasal polyps, or other nasal and sinus problems. Identifying the cause is important because treatment depends on what is obstructing the nasal passage.

In this article, we discuss 7 possible causes of one-sided nasal blockage, symptoms to watch for, and when to consult an ENT specialist.

What Is One-Sided Nasal Blockage?

One-sided nasal blockage occurs when airflow through one nostril is reduced or obstructed. It may be temporary or persistent.

Sometimes the blockage changes sides throughout the day. This can be part of the normal nasal cycle, in which the nasal passages naturally alternate between being more open and more congested.

However, blockage that remains consistently on the same side, especially when accompanied by bleeding, pain, or unusual discharge, deserves medical evaluation.

7 Causes of One-Sided Nasal Blockage

1. Deviated Nasal Septum

The nasal septum is the wall of cartilage and bone that separates the two nasal passages. When it is significantly displaced to one side, it is called a deviated nasal septum.

A deviated septum may be present from birth or develop after an injury to the nose.

Common symptoms include:

• Persistent blockage in one nostril

• Difficulty breathing through the nose

• Snoring or mouth breathing during sleep

• Recurrent nasal congestion

• Frequent nosebleeds in some cases

Mild deviations may not require treatment. If the obstruction significantly affects breathing, an ENT specialist may discuss medical management or septoplasty, depending on the examination findings.

2. Nasal Polyps

Nasal polyps are soft, noncancerous growths that develop in the lining of the nose or sinuses, usually in association with chronic inflammation.

They can obstruct airflow and may cause persistent congestion, reduced smell, and nasal discharge.

Most inflammatory nasal polyps affect both sides, but a growth that appears only on one side should be examined carefully to establish its nature.

Treatment may include prescribed nasal corticosteroids, management of underlying inflammation, or surgery in selected cases.

3. Chronic Sinusitis

Chronic sinusitis, also known as chronic rhinosinusitis, involves prolonged inflammation of the nasal and sinus lining.

It can contribute to nasal blockage, thick discharge, reduced smell, and facial pressure. Symptoms may be more noticeable on one side, depending on the affected sinuses and associated anatomy.

If congestion continues for around 12 weeks or longer, medical assessment may be appropriate.

An ENT specialist may recommend nasal examination, endoscopy, or imaging when indicated to determine the cause and guide treatment.

4. Allergic Rhinitis

Allergic rhinitis occurs when the immune system reacts to allergens such as dust mites, pollen, or animal dander.

It commonly causes sneezing, itching, a runny nose, and nasal congestion. Although allergies often affect both nostrils, congestion can feel more pronounced on one side because of the normal nasal cycle or differences in nasal anatomy.

Managing allergies may help reduce symptoms. Persistent blockage limited to one nostril should not automatically be attributed to allergy without considering other causes.

5. Enlarged Nasal Turbinates

Nasal turbinates are structures inside the nose that help warm, humidify, and filter inhaled air.

When the tissue becomes enlarged because of inflammation, allergies, or other factors, it can narrow the nasal passage and make breathing difficult.

Symptoms may include:

• Nasal congestion

• Reduced airflow through one nostril

• Mouth breathing

• Snoring

• Difficulty sleeping comfortably

Treatment depends on the underlying cause and may include prescribed medication or, in selected cases, a procedure to reduce turbinate size.

6. A Foreign Object in the Nose

A foreign object lodged inside the nose is an important possible cause of one-sided blockage, particularly in children.

Other warning signs can include:

• Foul-smelling discharge from one nostril

• Blood-stained nasal discharge

• Persistent irritation

• Discomfort or difficulty breathing through the affected nostril

If a foreign object is suspected, seek medical assistance rather than attempting blind removal with fingers or instruments.

If a button battery or magnet may be lodged in the nose, seek emergency medical care immediately. These objects can cause serious tissue damage.

7. A Nasal Growth or Other Structural Abnormality

Persistent one-sided nasal obstruction can occasionally be caused by a growth or another abnormality inside the nose or sinuses.

Many nasal symptoms have benign causes, but a growth should not be assumed to be harmless without examination.

Warning signs that need prompt assessment include:

• Persistent blockage on the same side

• Repeated nosebleeds

• Blood-stained or foul-smelling discharge

• Facial swelling or persistent facial pain

• Changes around the eye or vision problems

These symptoms do not necessarily indicate cancer, but they should be evaluated to rule out significant conditions.

When Should You See an ENT Specialist?

Consult an ENT specialist if you experience:

• Nasal blockage that persists on one side

• Difficulty breathing through the nose that affects sleep

• Repeated sinus symptoms

• Reduced sense of smell

• Frequent nosebleeds

• Persistent or unusual nasal discharge

• Facial pain or swelling

Seek urgent medical attention if nasal obstruction occurs with significant facial swelling, eye swelling, vision changes, severe headache, or other rapidly worsening symptoms.

Persistent one-sided obstruction, especially with bleeding, should be evaluated promptly rather than treated repeatedly with over-the-counter decongestants.

How Is One-Sided Nasal Blockage Diagnosed?

An ENT specialist may review your medical history and examine the inside of your nose.

Depending on your symptoms, the evaluation may include:

• Nasal examination: To identify visible swelling, discharge, or structural abnormalities.

• Nasal endoscopy: A thin camera may be used to examine deeper areas of the nasal passages.

• CT scan of the sinuses: This may be recommended when sinus disease or a structural problem requires further assessment.

• Allergy assessment: Considered when symptoms suggest allergic rhinitis.

• Additional investigations: These may be needed if an unusual growth or another significant condition is suspected.

Not every patient requires imaging or endoscopy. The tests depend on the clinical findings.

How Is One-Sided Nasal Blockage Treated?

Treatment depends on the underlying cause.

• Deviated nasal septum: Observation, symptom management, or septoplasty may be considered according to severity.

• Nasal polyps: Prescribed nasal corticosteroids and treatment of inflammation may help; surgery may be considered when appropriate.

• Chronic sinusitis: Treatment may involve saline irrigation, prescribed nasal medication, or other targeted therapy.

• Allergic rhinitis: Allergen management and suitable allergy medication may improve symptoms.

• Enlarged turbinates: Treatment may include medication or a procedure in selected cases.

• Foreign objects: Removal by a trained healthcare professional may be necessary.

• Nasal growths: Further investigation and treatment depend on the nature of the growth.

Avoid using decongestant nasal sprays for longer than recommended, as prolonged use can worsen congestion.

Can One-Sided Nasal Blockage Be Prevented?

Not all causes can be prevented, especially structural conditions such as a deviated septum. However, some measures may help reduce nasal irritation and inflammation:

1. Avoid smoke and known nasal irritants.

2. Manage allergies according to medical advice.

3. Use saline nasal rinses safely when appropriate.

4. Avoid inserting objects into the nose.

5. Seek assessment for persistent or recurring symptoms rather than relying on repeated self-treatment.

Conclusion

One-sided nasal blockage can result from a deviated septum, nasal polyps, chronic sinusitis, allergies, enlarged turbinates, a foreign object, or another nasal abnormality.

Although temporary congestion is common, persistent blockage affecting the same nostril should not be ignored, particularly if it occurs with nosebleeds, unusual discharge, facial pain, or swelling.

An ENT examination can help identify the cause and determine the most appropriate treatment.

Dr. Diptiman Baliarsingh provides ENT consultation in Cuttack, Odisha, for patients experiencing nasal obstruction, sinus symptoms, and other ear, nose, and throat concerns.

Consult Dr. Diptiman Baliarsingh

Clinic Address:
JCEM Diagnostics, Tarini Lane, Near Secondary Board High School, Bajrakabati Rd, Cuttack, Odisha – 753001

Call: +91 94384 36775
Email: support@drdiptimanent.com

Clinic Hours:
Morning & Afternoon: Monday–Sunday, 10 AM–4 PM
Evening: Monday–Friday, 6 PM–8 PM