In the medical field, stenosis means the abnormal narrowing of a body channel. When combined with the word spinal, it defines a narrowing of the bone channel occupied by the spinal nerves or the spinal cord.

Cervical Spinal Stenosis VideoCervical spinal stenosis is rarer and more dangerous than lumbar spinal stenosis.
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Cervical Spinal Stenosis Video

Some people are born with a congenital form, but most develop spinal stenosis as part of the degenerative cascade. A few do not feel any effects of the narrowing, but as part of the aging process, most people will eventually notice radiating pain, weakness, and/or numbness secondary to the compression of the nerves or spinal cord.

See Radiculopathy, Radiculitis and Radicular Pain

While the narrowing may occur at different parts of the spine, the symptoms of nerve compression are often similar. That is why specialists often will perform testing to determine the cause and location of the narrowing.

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Lumbar vs. Cervical Stenosis

The lower back develops lumbar stenosis, while the neck develops cervical stenosis.

Thoracic stenosis can also occur, but is less common. The thoracic part of the spine is the middle/upper portion of the spine, and mainly consists of the vertebrae that are attached to the rib cage. This stable and strong part of the spine allows for minimal movement, which is why degenerative conditions such as spinal stenosis are less likely to develop.

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Sciatica Nerve AnatomyLearn how what can happen to the sciatic nerve during the course of lumbar spinal stenosis to cause sciatica. Watch: Sciatic Nerve Anatomy Video

Spinal Stenosis and the Aging Spine

Spinal stenosis is related to degeneration in the spine and usually will become significant in the 5th decade of life and extend throughout every subsequent age group. As it is a gradual process and rarely causes immediate symptoms, the subtle changes of spinal stenosis often result in a gradual decrease in physical activity, and a development of a more kyphotic or forward flexed posture.

See All About Thoracic Kyphosis: Forward Curvature of the Upper Back

This gradual accommodation may be evident when looking at a series of oneself in pictures—over the course of several years—after around age 50. It is typical to start stooping forward more and become less active as effects of spinal stenosis increase.

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