Lumbar stenosis is a condition where the spinal canal in the lumbar (lower) spine begins to narrow. It is often caused when tissues or bones begin to grow in the openings of the spinal bones, squeezing or irritating nerves branching out from the spinal cord. The condition is usually caused by changes that happen as people age, such as the wearing out of ligaments that help to maintain spine stabilization. Symptoms may include leg pain when attempting to walk or a tingling, weakness or numbness beginning in the lower back into the buttocks and legs.