Degenerative disc disease isn't really a disease. It's a term used to describe the normal changes in your spinal discs as you age. Spinal discs are small, spongy discs that separate the bones (vertebrae) that make up the spine. The discs act as shock absorbers for the spine. They let your spine flex, bend, and twist.
Degenerative disc disease can take place in one or more places along the spine. It most often occurs in the discs in the lower back and the neck.
The changes in the discs can cause back and neck pain. They can also lead to osteoarthritis, a herniated disc, or spinal stenosis.