The history given by a patient of sinusitis suffices in most cases to diagnose the condition. Tenderness over the sinuses on pressure further confirms the diagnosis. A physical examination done by the physician will rule out or confirm conditions such as nasal polyps, deviated nasal septum, nasal tumor, dental caries, etc. that can be a cause of sinusitis.
Certain investigations may be done to confirm sinusitis thought these are rarely done: