목적: Symptoms of allergic rhinitis include rhinorrhea, nasal obstruction, nasal itching, sneezing, and postnasal drip that reverse spontaneously or after treatment. Septal deviation also cause nasal obstruction. Asymptomatic allergen sensitized people with septal deviation can be confused with allergic rhinitis patients. 방법:In this Allergic Rhinitis Cohort Study (ARCO), consecutive people with rhinitis symptoms underwent skin prick tests (SPTs). People who had allergen sensitivity with at least one rhinitis symptoms were included in this cohort. Four rhinitis symptoms were evaluated using the Visual Analogue Scale (VAS), which included nasal obstruction, sneezing, watery rhinorrhea, nasal itching and eye symptoms. The patients were divided 2 groups according to septal deviation. 결과:601 people fulfilled the symptom survey and endoscopic examination. 419 (69.7%) had septal deviation. Interestingly, sneezing, watery rhinorrhea and nasal itching scores were significantly higher in the patients without septal deviation. Among the patients with septal deviation, 50 patients had moderate to severe nasal obstruction and mild other rhinitis symptoms. After exception those patients, sneezing, watery rhinorrhea and nasal itching were not significantly different between 2 groups. 결론:Asymptomatic allergen sensitized people with septal deviation can mimic allergic rhinitis. When we met the allergen sensitized people with nasal obstruction predominantly, septal deviation should be considered before diagnosis of allergic rhinitis.