If you’ve ever had a sinus infection, you know the pain and discomfort it can cause. Medically termed sinusitis, a sinus infection occurs when the cavities around your nose become swollen and inflamed.
Sinusitis is most often caused by a virus and often lasts long after the other upper respiratory symptoms are gone. Rarely, fungus or bacteria may cause a sinus infection. Allergies, nasal polyps, a tooth infection, and a deviated septum are other ways in which sinusitis may be triggered.