The sinuses are hollow areas in the skull that are arranged in pairs. Sinusitis occurs when the tissue lining the sinuses in the skull around the nose (the paranasal sinuses) becomes inflamed and infected. Acute sinusitis usually lasts about 1-4 weeks, while chronic sinusitis is diagnosed when symptoms last three or more months. The third form, recurrent acute sinusitis, occurs more than three times a year.
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