Sinusitis is an inflammation of the membranes lining the paranasal sinuses—small air-filled spaces located within the skull or bones of the head surrounding the nose. Sinusitis can be caused by an infection or other health problem, and symptoms include facial pain and nasal discharge. Nearly 30 million adults in the United States are diagnosed with sinusitis each year, according to the Centers for Disease Control and Prevention.
The paranasal sinuses comprise four pairs of air-filled spaces:
There are two basic types of sinusitis:
NIAID supports research to better understand the causes of sinusitis and to develop new treatments for the condition.
Last Updated May 15, 2015
Last Reviewed May 15, 2015