In this study, the cases of patients under age 18 who had been admitted to the hospital over a five-year period for nasal polypectomy were reviewed for evidence of allergy or other possible predisposing conditions. Two of the children had cystic fibrosis and one had Kartagener's syndrome. Of the remaining 21 patients, 12 (57%) had four or more positive criteria for allergic disease, out of eight criteria considered. It is concluded that in the majority of children with nasal polyposis, allergy can be implicated as a causative factor.