The spine is comprised of 26 bone discs, also known as vertebrae. The vertebrae protect your spinal cord and allow you to stand and bend. A number of issues including injuries, infections, tumors, spine deformities, bones changes due to aging can all change the structure of the spine or damage the vertebrae and surrounding tissue. Spinal diseases can often cause pain when bone changes put pressure on the spinal cord or nerves, which can also limit movement. Treatments differ by disorders, but they include medication, physical therapy, back braces and surgery.