What is sinusitis (sinus infection)?

Updated: Mar 01, 2018
  • Author: Itzhak Brook, MD, MSc; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Sinusitis is characterized by inflammation of the lining of the paranasal sinuses. Because the nasal mucosa is simultaneously involved and because sinusitis rarely occurs without concurrent rhinitis, rhinosinusitis is now the preferred term for this condition. Rhinosinusitis affects an estimated 35 million people per year in the United States and accounts for close to 16 million office visits per year. [1] See the image below.

Air-fluid level (arrow) in the maxillary sinus sug Air-fluid level (arrow) in the maxillary sinus suggests sinusitis.

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