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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.
Sinus headaches hurt because of a pressure build-up inside the sinus cavities. When a sinus cavity becomes infected with a bacterial or viral infection, the body sends white blood cells to the location in the sinuses to fight off the infection. White blood cells cause swelling and inflammation in the sinuses. The body also starts producing lots of mucus to help flush the bacteria and viruses out.