. . "In general, chronicity is installed after several attacks of acute sinusitis.Pansinusitis can be explained by several factors: allergies to hair of animals, the mites, pollen, fungi or other substances that can cause inflammation of the nasal mucosa.Other possible factors:??Smoking (active or passive)??Weakened immune system??Anatomic anomaly: a deviated nasal septum??Nasal polyps??swimmingInhali" . . .