Editing Sciatica (section)

===Spinal stenosis===
{{main|Lumbar spinal stenosis}}
Other compressive spinal causes include [[lumbar spinal stenosis]], a condition in which the [[spinal canal]], the space the spinal cord runs through, narrows and compresses the spinal cord, [[cauda equina]], or sciatic nerve roots.<ref name=":2" /> This narrowing can be caused by [[Exostosis|bone spurs]], [[spondylolisthesis]], [[inflammation]], or a [[herniated disc]], which decreases available space for the spinal cord, thus pinching and irritating nerves from the spinal cord that become the sciatic nerve.<ref name=":2" /> This is the most frequent cause after age 50.<ref name=tarulli_radiculopathy/> Sciatic pain due to spinal stenosis is most commonly brought on by standing, walking, or sitting for extended periods of time, and reduces when bending forward.<ref name=tarulli_radiculopathy/><ref name=":2" /> However, pain can arise with any position or activity in severe cases.<ref name=":2" /> The pain is most commonly relieved by rest.<ref name=":2" />