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The sinuses are small, empty spaces behind your cheekbones and forehead that connect to the inside of the nose Sinusitis causes the lining of the sinuses to swell up This stops mucus draining into your nose and throat properly, making you feel blocked up0611 · Sinuses In humans, there are four pairs of cavities (airfilled spaces) known as paranasal sinuses These small hollow spaces, which are located within the skull or bones of the head surrounding the nose, are named for the bones that contain them, as follows Frontal sinuses over the eyes in the brow area Maxillary sinuses inside each cheekboneDefine Sinuses Sinuses synonyms, Sinuses pronunciation, Sinuses translation, English dictionary definition of Sinuses sinus n 1 A depression or cavity formed by a bending or curving 2 Anatomy a A dilated channel or receptacle containing chiefly venous blood b Pediatric Ent And Sinus Disease Sinusitis Sinuses definition