Also known as:
Sinus infection, Chronic sinusitis
Sinusitis is infection or inflammation of the lining of the sinus cavities. These are hollow spaces in your cheeks and around your eyes. Sinus infections often follow a cold and cause pain and pressure in your head and face.
Sinusitis can be either acute (sudden) or chronic (long-term). With chronic sinusitis, the infection or inflammation does not completely go away for eight weeks or more.