What causes catarrh?

Catarrh is caused by outside irritating agents that end up in airways and cavities. To fight this reaction, the body sends white blood cells that protect against infection, which build up in the affected area and cause swelling a mucus production. Common infections like colds can cause catarrh, as well as allergies. Allergic rhinitis is traditional indoor and outdoor allergies like dust and pollen. Non-allergic rhinitis is when irritants like pollution and weather cause a person's blood vessels to swell. Both cause catarrh.

Nasal polyps, which are obstructing bumps inside the nose, prevent the beneficial drainage of mucus from the nose. This buildup of mucous causes catarrh.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.