Spinal Nerve Compression
Spinal nerves exit and pass into arms and legs from each intervertebral disc. The spinal cord and the spinal nerves send messages to the brain and then to the arms and legs to control sensation and movement. The fibers of one spinal nerve root affect a specific area of the body, so a nerve that is compressed or pinched causes symptoms in a specific region of the body. Symptoms include pain and stiffness in the neck, upper back, or lower back, and burning pain, numbness, or weakness that spreads down the legs, arms, or buttocks.
Arthritis 
