Sinus headaches are caused by swollen sinus cavities, creating pressure and pain over the cheeks and possible radiation to the oral cavity. Sinus headaches are the result of a bacterial or viral infection of the mucosa lining within the sinus cavities. Allergens may also trigger a sinus headache. Sufferers often describe the pain as dull and vague, although it can escalate to severe pain.
Sinus headaches are often confused with Migraines.