Acute sinusitis is a bacterial infection of the sinuses.
Sinuses are air cavities behind your cheekbones, eyebrows, and eyes. Sinus infections are one of the most common reasons for office visits by adults. If you have a sinus infection, you will probably have several of the symptoms listed below, not just one. Other conditions that make sinus infections more likely are allergies, asthma, smoking, nasal polyps, or a deviated septum. Pain or headache over the affected sinus.