What does " sinus disease" mean?

Paranasal Sinuses: The paranasal sinuses, or simply - sinuses - are cavities within the bones of your skull that lighten the skull and allow air and sound to resonate. The sinuses also naturally function to clean particles and filter air. Sinus disease indicates an abnormality in these normal/natural processes. Most commonly, there can be an anatomical or structural blockage, allergy, inflammation...