Customer (name blocked for privacy),
The most common cause is aging. As we age, the discs in the spine dry out and lose their ability to act as shock absorbers between the vertebra. The bones and ligaments of the spine also become less flexible and thicken. There are two studies that strongly indicate that genes for degenerative disc disease does exist. You can read more about these studies at
http://www.chirogeek.com/000_DDD_Page-2_DDD.htm
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