A deviated septum occurs when the cartilage divider inside the nose, the nasal septum, is off-center or crooked, causing difficulty breathing. While this does cause problems while the person is awake, it is also a common cause of snoring. Too little oxygen enters through the nasal passages, so the lungs must exert themselves to get adequate airflow. Minimally invasive surgery usually corrects this in individuals for whom the symptoms begin impairing quality of life.
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