DefinitionBy Mayo Clinic staff
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Chronic sinusitis is a common condition in which the cavities around nasal passages (sinuses) become inflamed and swollen. Chronic sinusitis lasts 12 weeks or longer despite treatment attempts.
Also known as chronic rhinosinusitis, this condition interferes with drainage and causes mucus to build up. If you have chronic sinusitis, it may be difficult to breathe through your nose. The area around your eyes and face may feel swollen, and you may have throbbing facial pain or a headache.
Chronic sinusitis may be caused by an infection, but it can also be caused by growths in the sinuses (nasal polyps) or by a deviated nasal septum. Chronic sinusitis most commonly affects young and middle-aged adults, but it also can affect children.
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