A herniated disk, on the other hand, results when a crack in the tough outer layer of cartilage allows some of the softer inner cartilage to protrude out of the disk. Herniated disks are also called ruptured disks or slipped disks, although the whole disk does not rupture or slip. Only the small area of the crack is affected. Compared with a bulging disk, a herniated disk is more likely to cause pain because it generally protrudes farther and is more likely to irritate nerve roots. The irritation can be from compression of the nerve or, much more commonly, the herniation causes a painful inflammation of the nerve root.