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What causes a sinus infection?

Sinusitis, or a sinus infection, occurs when the sinuses and nasal passages become inflamed. Most sinus infections are caused by a virus. Sinus infections are rarely caused by bacteria. Other causes of sinusitis include:

  • allergies
  • pollutants (airborne chemicals or irritants)
  • fungal infections
  • structural problems within the nasal cavity
  • a weak immune system

Continue Learning about Sinusitis

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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.