A deviated septum occurs when the thin wall (nasal septum) between the nostrils shifts to one side. In many people, the nasal septum is offside. In many people, the nasal septum is off-center or deviated, making one nostril smaller.

When the deviated septum is severe, it can block part of the nose and reduce airflow, causing shortness of breath.

Exposure of a deviated septum to the drying effect of airflow through the nose can sometimes contribute to crusting or bleeding in certain individuals.

A blocked stuffy nose (obstruction) can occur from a deviated nasal septum, inflammation of the tissues lining the nose, or both.

Treatment of nasal obstruction may include medications to reduce swelling. To correct a deviated septum you will need surgery.