This is a term used to describe a bend or deformity of the nasal septum (the internal midline partition of the nose made up of cartilage and bone). This condition is known to occur in majority of the population. If severe it may cause nasal obstruction, and predispose to symptoms of sinusitis or nasal bleeding.

Usually no treatment is required if the patient does not have any symptoms. In those who do have symptoms, the deviated is corrected surgically through the nostrils by a procedure called a septoplasty.