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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.
Fungi, Bacteria and viruses can be a cause of sinusitis. Any infection of the nasal passages that cause it to swell can affect the opening of the sinuses. If the ostium (opening) is blocked, air and mucus secretions collect and cause pressure on the sinus cavity walls. This can also cause our cilia (hair like cells responsible for the removal of mucus) not to work properly and is the main reason why we have pain during sinusitis. Mucus is an excellent culture medium for bacteria and if the mucus is not cleared quickly, bacteria can infect the sinus and an abscess may develop.