According to information from the Harvard Medical Schools, a deviated septum is a nasal septum (the wall between the left and right sides of the nose) that is dramatically off-center.
The nasal septum is firm, but bendable, and it is covered by skin that has a rich supply of blood vessels. Ideally, the nasal septum should lie exactly in the center, so that the left and right sides of the nose are of equal size. In about 80% of us, however, the nasal septum is a little off-center, although most of us never notice.

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