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Allergies Health Center

Sinus Infection Directory

Sinus infection, also called sinusitis, describes sinuses and nasal passages that are irritated and inflamed. Sinus infections are treatable. Follow the links below to find WebMD's comprehensive coverage about what causes sinus infections, risk factors, treatment, and much more.

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Thumbnail: Is It a Cold or a Sinus Infection?

How can you tell the difference between a cold and a sinus infection? And how do you treat them?

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