A deviated septum, or nasal septum deviation (NSD), is when the septum (the thin wall separating the two nasal passageways in the nose) is off-center. A deviated septum curves to one side ...

A deviated septum occurs when the nasal septum is off-center. The nasal septum is the thin wall within the nose separating the nasal cavity. When this tissue is significantly displaced to one side ...