Sinusitis or sinus infection is inflammation of the air cavities within the passages of the nose.
Sinusitis can be caused by infection,allergies, and chemical or particulate irritation of the sinuses.
Most people do not spread sinus infections to other people.
Sinusitis may be classified as acute sinus infection, subacute sinus infection, chronic sinus infection, infected sinusitis, and noninfectious sinusitis.
