The paranasal sinuses are mucosa-lined chambers in the bone of the skull and face. There are several of them surrounding the nasal passages. Normally, mucous secretions that are produced in the sinuses flow out of openings into the nasal passage. However, if a sinus is obstructed so that its contents cannot exit, the pressure inside the sinuses can build up. This can occur with mucosal swelling associated with allergy (allergic rhinitis or hay fever) or with infection such as a cold or sinus infection. When pressure builds up inside a sinus, it can cause pain. While some sinuses (such as the large maxillary sinuses) are in the face, most are associated with the base of the skull. This pain can be interpreted and described as headache. While these sinus headaches can occur in anyone with a “stuffed nose” of any cause, patients who have chronic sinus problems with recurrent sinus infections can often have quite severe pain associated with this condition.
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