When the spaces in the spine start to narrow pressure is applied to the spinal cord and nerves in the spinal canal. This condition is referred to as spinal stenosis. In most instances, the lower back or neck region are the areas affected by the narrowing of the spine. Symptoms can range from very mild to severe complications. Many individuals do not experience any noticeable symptoms but others may have pain, numbness, muscle weakness, or problems with bowel or bladder function problems. Spinal stenosis is commonly attributed to aging or regular wear and tear that occur over time.