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Spinal disks are small, round cushions between the vertebrae of the spinal column.
These disks have a tough, fibrous tissue on the outside and a watery, gelatinous material inside. The purpose of these disks is to cushion each vertebrae during movement. A herniated disk is a disk that has bulged out from its proper place. It may press on nearby nerves and cause severe pain. A herniated disk occurs when the disk is damaged by a number of situations.