Common Causes Of Nasal Congestion
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9 August 2026
Nasal congestion (a blocked or stuffy nose) happens when the nasal lining becomes swollen or produces excess mucus. Common causes include:
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Common cold: One of the most frequent causes, often comes with a runny nose, sore throat or cough
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Allergies: Dust, pollen, pet dander or mould can cause congestion, sneezing and itchy/watery eyes
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Sinus infection (sinusitis): Congestion may come with facial pressure/pain, thick mucus and reduced sense of smell
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Allergic or non-allergic rhinitis: Irritation from weather changes, strong smells, smoke, pollution or spicy foods can trigger congestion even without an infection
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Deviated nasal septum: Structural narrowing can cause persistent or one-sided blockage
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Nasal polyps: Soft growths inside the nose can lead to long-term congestion and reduced smell
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Dry air or irritation: Very dry environments, smoke and air pollution can irritate the nasal passages
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Overuse of decongestant nasal sprays: Using sprays such as oxymetazoline for too long can cause rebound congestion
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Hormonal changes: Pregnancy and some hormonal fluctuations can cause nasal swelling
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