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Sinusitis is inflammation of the sinuses. The sinuses are air-filled spaces in the skull located behind the forehead, nasal bones, cheeks, and eyes. Inflammation can occur as the result of an infection from a virus, bacteria, or fungus.  Sinus headache is a common symptom described as pressure-like pain, pain behind the eyes, toothache, or tenderness of the face.

Click here for more information.  http://www.nlm.nih.gov/medlineplus/ency/article/000647.htm

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