Sinusitis is inflammation of the sinus cavities. It is usually associated with infection. The sinus cavities are air-filled spaces in the skull.
Sinusitis is called acute if it lasts for less than 4 weeks, subacute if it lasts 4-12 weeks, and chronic if symptoms last for more than 3 months. You may have recurrent sinusitis if you have repeated bouts of acute sinusitis.
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Last reviewedSeptember 2014by Michael Woods, MD
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