Disease caused by aging of vertebral bodies and discs

Between vertebral bodies, there are buffering discs. The round and flat discs consist of nucleus pulposus at the center and annulus fibrosus surrounding nucleus pulposus. As people age, the bones and discs lose their moisture component, become hard, shrink, and cannot absorb impacts. Through the process of degeneration under the increased pressure of the discs, the intervals between the vertebral bodies get narrower, resulting in a collision of the bones and displacement. The displaced discs and develop osteophytes can stimulate the nerve and cause pain.