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The most common cause of spinal stenosis is aging. Degenerative processes occur throughout the body as it ages. Tissues in the spine may start to thicken, and bones may get bigger, compressing the nerves. Conditions like osteoarthritis and rheumatoid arthritis may also contribute to spinal stenosis.
1 Lumbar spinal stenosis is a condition whereby either the spinal canal (central stenosis) or one or more of the vertebral foramina (foraminal stenosis) becomes narrowed. 2  Lumbar spinal stenosis is typically caused by degenerative arthritis.