Disks lie between the spinal bones (vertebra). They serve as shock absorbers. This protects the spine and helps it stay flexible. Degenerative disk disease is wear and tear on the disks. This wear and tear causes pain and other symptoms. Most people have some degeneration in disks as they age. Not all degeneration will result in symptoms of this disease.

Degenerative Disk
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The disk is usually dehydrated, and not as resilient as normal. The fibrous tissue, which holds the disk material in place, may suffer small tears. These tears lead to further damage. There is some evidence that genetics may play a part for some people.