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Blocked Nose

A blocked nose can make breathing and sleeping difficult. Discover how allergies cause nasal congestion and what treatments may help restore clearer airflow.

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Condition Overview

Allergy-Related Causes of a Blocked Nose

A blocked or congested nose is a very common problem in Australia and is frequently caused by allergies. Allergic nasal symptoms are often grouped under the term allergic rhinitis, which affects millions of Australians each year and can significantly impact sleep, concentration, work productivity, and quality of life.

  • Identifying Triggers

Common Allergy Triggers

Pollen Allergies (Hay Fever)

Pollen is one of the most common causes of allergic nasal congestion in Australia.

  • Grass pollen is the leading trigger, particularly ryegrass, which is widespread in southern Australia.
  • Tree pollen (such as birch, olive, and cypress) is more common in late winter and spring.
  • Weed pollen can affect people in warmer regions and during summer.

Symptoms are often seasonal, worsening in spring and early summer, and may be more severe on windy days or after thunderstorms.

Dust Mite Allergy

House dust mites thrive in warm, humid indoor environments and are a year-round cause of blocked noses.

  • Common in bedding, carpets, soft furnishings, and mattresses
  • Symptoms are often worse:
    • In the morning
    • At night
    • Indoors

Dust mite allergy is a leading cause of persistent nasal congestion, especially in children.

Mould Allergy

Mould spores are common in many parts of Australia, particularly in:

  • Humid or coastal regions
  • Poorly ventilated homes
  • Bathrooms, laundries, and damp areas

Exposure can cause nasal blockage, sneezing, and sinus pressure, and symptoms may worsen after rain or in damp environments.

Animal Dander

Proteins found in the skin flakes, saliva, and urine of animals can trigger allergic nasal symptoms.

  • Cats and dogs are the most common triggers
  • Symptoms may persist even after the animal is no longer present, as allergens remain in carpets and furniture

Occupational and Environmental Allergens

Some people develop nasal allergies due to repeated exposure at work or in their environment, such as:

  • Flour dust (bakers)
  • Wood dust
  • Chemicals or fumes
  • Latex or laboratory animals

These allergies can lead to chronic nasal congestion if exposure continues.

  • Diagnosis Process

When to Seek Medical Advice

You should consider seeing a healthcare professional if:

  • Nasal blockage is persistent or severe
  • Symptoms interfere with sleep, school, or work
  • Over-the-counter treatments are ineffective
  • There are symptoms of sinus pain, facial pressure, or frequent infections

An allergy assessment may help identify triggers and guide appropriate treatment.

  • Treatment Options

Allergic vs Non-Allergic Blocked Nose

It’s important to distinguish allergies from other causes of nasal blockage:

Allergic Rhinitis

Common Cold

Clear nasal discharge

Thick or coloured mucus

Itchy nose and eyes

Body aches, fever

Long-lasting or seasonal

Usually resolves in 7–10 days

Triggered by allergens

Caused by viruses

If symptoms last longer than 10 days or recur frequently, allergies are more likely.

Managing Allergy-Related Nasal Congestion

Treatment may include:

Allergen avoidance strategies

Antihistamines

Corticosteroid nasal sprays

Saline nasal rinses

Allergen immunotherapy in selected cases

Early and appropriate treatment can significantly reduce nasal blockage and improve quality of life.

Summary

In Australia, allergies are a leading cause of blocked nose, most commonly due to pollen, dust mites, mould, and animal allergens. Unlike infections, allergic nasal congestion is often long-lasting and recurring. Recognising allergy triggers and managing symptoms effectively can make a significant difference to daily comfort and long-term health.

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