Nasal & Sinus Center

What Is Sinusitis?

Sinusitis is inflammation or infection of any of the four groups of sinus cavities in the skull, which open into the nasal passages. Sinusitis is not the same as rhinitis, although the two may be associated and their symptoms may be similar. The terms "sinus trouble" or "sinus congestion" are sometimes wrongly used to mean congestion of the nasal passage itself. Most cases of nasal congestion, though, are not associated with sinusitis.