Sinuses are bony, hollow, air-filled cavities inside the face and skull. They are located in the low-center of the forehead, behind the eyes and in bones behind the nose.
Cedars-Sinai Medical Center says the sinuses lighten the skull and produce a mucus that moisturizes the inside of the nose. Unfortunately, when colds or the flu strike, sinuses may become one of the first spots affected by these illnesses.
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