The spine, a row of 26 bones in your back, allows you to stand up straight and bend over. The spine also protects your spinal cord from being hurt. In people with spinal stenosis, the spine is narrowed in one or more of three parts:
• The space at the center of the spine
• The canals where nerves branch out from the spine
• The space between vertebrae (the bones of the spine).
This narrowing puts pressure on the spinal cord and nerves and can cause pain.