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1 Ethmoid Sinus Cavities â are located in-between the eyes. 2  An infection in these sinus cavities can cause pain in-between the eyes. 3  This pain can extend to the forehead and cause headaches. 4  Frontal Sinus Cavities â are found above the eye and eye bone.
The sinuses drain through channels in the nose. When a sinus becomes inflamed, usually as the result of an allergic reaction, a tumor, or an infection, the inflammation causes swelling and increased mucus production and the channels can become blocked. The increased pressure in the sinuses causes a pain similar to that of a headache.