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The nasal septum runs vertically down the middle of the nose and divides the two sides of the nasal cavity. Made of bone and cartilage, the septum has a thin sheet-like appearance and divides the nasal passages equally into the right and left sides. In some individuals, the septum may be crooked, bent, or the bony portions may have formed bone spurs that can block airflow into the nasal airway and cause difficulty breathing. This type of nasal obstruction is known as a deviated septum.