A deviated septum occurs when the thin wall between the nostrils, called the septum, is displaced to one side. This condition can lead to breathing difficulties, nasal congestion, and increased susceptibility to sinus infections. It can be caused by genetics or injury to the nose. Many people with a deviated septum may not experience significant problems, but for some, it can affect sleep quality and overall health. Treatment options include medications to manage symptoms or surgery to correct the septum's position, improving airflow and reducing discomfort.