Stenosis in the spine is a narrowing of the canal that is around the spinal cord and nerve roots in your back. It can happen as part of aging. Sometimes bone and other tissue grow into this canal and press on the nerves that branch out from the spinal cord. This can cause pain, numbness, and weakness. When it happens in the lower part of your back, it is called lumbar spinal stenosis. It can cause problems in the legs, feet, and rear end (buttocks).
You may be able to get relief from the symptoms of spinal stenosis by taking pain medicine. Your doctor may suggest physical therapy and exercises to keep your spine strong and flexible. Some people try steroid shots to reduce swelling. If pain and numbness in your legs are still so bad that you cannot do your normal activities, you may need surgery.