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What causes sinus infections?

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Usually, sinus infections are caused by viruses, like a cold virus. But if the sinuses have been blocked for too long, bacteria can invade, causing a secondary infection. Having multiple sinus infections can lead to chronic (long-term) sinusitis.

From: Sinus Infections and Asthma WebMD Medical Reference

SOURCES: American Academy of Allergy, Asthma & Immunology: "Tips to Remember: Sinusitis" and "Sinusitis." American Academy of Family Physicians: "Impact of Chronic Sinusitis on Patients with Asthma." Asthma and Allergy Foundation of America: "Rhinitis and Sinusitis" and "Sinus Problems." Dixon A.E. et al, August 2006.  Slavin R.G. , 2005.




Chest,ACP Medicine

Reviewed by Louise Chang on July 05, 2018

SOURCES: American Academy of Allergy, Asthma & Immunology: "Tips to Remember: Sinusitis" and "Sinusitis." American Academy of Family Physicians: "Impact of Chronic Sinusitis on Patients with Asthma." Asthma and Allergy Foundation of America: "Rhinitis and Sinusitis" and "Sinus Problems." Dixon A.E. et al, August 2006.  Slavin R.G. , 2005.




Chest,ACP Medicine

Reviewed by Louise Chang on July 05, 2018

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