A slipped disk, also known as herniated disk, compressed disk, or ruptured disk, is a common condition in which the intervertebral disks of the spinal column degenerate with extrusion of the central soft portion through the outer fibrous ring. The protruding material may cause back pain, or may press upon the spinal cord or on nerves as they leave the spinal cord (causing sciatica). Prolonged bed rest and anti-inflammatory medicines are effective treatments in many cases, but traction, manipulation, or surgery may also be required particularly if there is paralysis or nerve involvement.