Rhinosinusitis headache, also called ‘sinus headache’, occurs due to increased pressure or inflammation in the sinuses. This can be triggered by allergies, an acute sinus infection, or ongoing sinus problems (which can cause chronic headache). The headache is exacerbated if pressure is applied to the facial areas overlying the sinuses (i.e., forehead, cheeks) which in themselves may be tender. The pain is most commonly perceived as frontal or facial, located towards the nasal region. If the sinuses are only blocked on one side of the face, the headache will be localised to that side as well.