Actually the term 'Slipped Disc' does really describe, it's because the disc does not only slip out of place but bulges out towards the spinal cord. Furthermore, when the advancing age and body weakness it allowing the soft part to swell.

For many years, it was assumed that back pain was usually the result of spinal degeneration or injury, especially damage to the inter-vertebral disks. These are structures located between the vertebrae that act as cushions.