BACKGROUNDIt is a matter of controversy that whether deviated nasal septum is contributing to Eustachian tube dysfunction. In this study, the investigator observed a number of patients with deviated nasal septum (DNS) undergoing surgical correction and was interested to find out whether DNS was contributing to the development of Eustachian tube dysfunction (ETD) in these patients. Aims of this study-(i) To find the incidence of decrease in the negativity of middle ear pressure (MEP) in patients undergoing septoplasty for deviated nasal septum, and (ii) Among patients undergoing septoplasty, to study the relative proportion of decrease in the negativity of MEP in patients who are also having allergic rhinitis and chronic sinusitis. Settings & Design-This was a prospective analytical study done in a tertiary care centre in south India.