Behcet disease (BD) is a systemic autoimmune/autoinflammatory, T helper 1-mediated condition. It is well known that the prevalence of a T helper 1-mediated disease increases in the presence of another T helper 1-mediated comorbidity. The purpose of this study was to investigate the prevalence of T helper 1-mediated chronic rhinosinusitis without nasal polyposis (CRSsNP) and T helper 2-mediated chronic rhinosinusitis with polyposis in the presence of comorbid BD. Sixty-nine patients and 74 healthy controls were included in the study. Participants were asked to complete a questionnaire for symptoms of rhinosinusitis. Nasal cavities were scored using the Lund-Kennedy endoscopy scores. Paranasal sinus computed tomography imagings were scored according to Lund-Mackay radiology scores. Skin prick tests were carried out for all participants to determine the predisposing role of allergy (T helper 2 disease) in the etiopathogenesis of rhinosinusitis among patients and controls. Patients' endoscopy, radiology, and skin prick testing scores were evaluated with regard to BD activity.