The spinal cord branches out to all parts of the body. The part of a nerve that connects to the spinal cord is called a nerve root. If one of these roots is injured or pinched, pain, weakness, numbness or tingling may be felt in the part of the body served by that nerve.
When a spinal disc ruptures, it may press on a nerve root.
The bones creating the spinal canal may grow inward, pinching a nerve root.
Degenerative Disc Disease
If a spinal disc weakens, vertebral bones above and below may touch, pinching nearby nerve roots. Bony spurs also may press on the nerves.