Spinal stenosis occurs when the space around the spinal cord narrows.
This puts pressure on the spinal cord and the spinal nerve roots, and may cause pain, numbness, or weakness in the legs. It often results from the normal aging process. As people age, the soft tissues and bones in the spine may harden or become overgrown. These degenerative changes may narrow the space around the spinal cord and result in spinal stenosis.