A slipped disc is the swelling in the cushion between the vertebra (individual bones of the spine). This cushion between the vertebra is called a disc and is filled with a gel-like substance that provides the mobility and flexibility to the spine. A slipped disc often presses on a nerve root which can cause pain and other symptoms in the legs. Slipped Disc is also known as Bulged disc, Herniated disc, Prolapsed disc, or Protruding disc