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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.
Canal stenosis refers to the narrowing of the central vertebral canal that houses the spinal cord. The condition is referred to by various names, such as spinal stenosis, central spinal canal stenosis or central stenosis. Causes. Spinal stenosis can be caused by a number of conditions, many occurring as a result of the natural aging process.