Cervical Spinal Stenosis: Causes & Treatment

Cervical spinal stenosis is narrowing of the spinal canal in the neck — the bony channel that protects the spinal cord. Mild narrowing is common with age and often causes no problems, but when the narrowing presses on the spinal cord it can lead to a condition called cervical myelopathy. Understanding the difference between the narrowing itself and its effect on the cord helps explain why some people need only monitoring while others need more active treatment.

What is cervical spinal stenosis?

The spinal canal runs through the vertebrae and houses the spinal cord and nerve roots. Cervical spinal stenosis describes a reduction in the space within this canal in the neck, most often due to age-related changes such as disc bulging, bony spurs, thickened ligaments and enlarged joints.

Stenosis is a description of the narrowing. Whether it causes symptoms depends on how much space is lost and whether the cord or nerves are pressed upon. When the narrowing compresses the spinal cord and affects its function, the result is cervical myelopathy.

Which parts of the spine are affected?

Cervical spinal stenosis affects the cervical spine, the seven vertebrae of the neck. Narrowing can occur at one or several levels, most commonly in the lower neck where wear is greatest. Depending on where the narrowing is, it may affect the central canal (pressing on the spinal cord) or the side openings through which nerve roots exit (contributing to arm symptoms).

Causes and risk factors

The commonest cause is age-related wear of the spine, including:

• Bulging or degenerating discs.
• Bony spurs forming around the joints and vertebrae.
• Thickening of the ligaments within the canal.
• Enlargement of the facet joints.

Some people are born with a naturally narrower canal, which makes symptomatic stenosis more likely with age. Previous neck injury and certain conditions affecting the ligaments can also contribute.

Symptoms and warning signs (red flags)

Mild stenosis may cause no symptoms. When the cord is affected, symptoms develop gradually and may include hand clumsiness, difficulty with fine tasks such as buttons or writing, a tendency to drop objects, numbness or tingling in the arms, and unsteady walking. Neck pain and stiffness may also be present.

Seek prompt assessment if you notice any of these red flags:

• Worsening hand clumsiness or difficulty with fine movements.
• Unsteadiness, frequent stumbling or balance problems.
• Weakness or numbness in the arms or legs.
• Problems with bladder or bowel control.
• A sudden deterioration after a fall or neck injury.

These features suggest the spinal cord may be compressed and need timely evaluation.

How cervical spinal stenosis is diagnosed

Diagnosis combines a clinical examination — testing strength, reflexes, sensation, co-ordination and walking — with imaging. MRI is the most useful test, showing the spinal canal, cord and nerves and revealing where and how much narrowing is present. CT may add detail about the bone. Because narrowing is often seen on scans of people without symptoms, the imaging is always interpreted alongside the clinical picture.

Non-surgical treatment

For mild stenosis without significant cord compression, non-surgical care and monitoring are often appropriate. Options include:

• Exercise and physiotherapy to maintain movement, strength and balance.
• Posture and activity adjustments, with attention to avoiding falls.
• Simple pain relief where appropriate, used for the shortest helpful period.
• Regular review to watch for any change in symptoms.

The aim is to maintain function and detect any progression early.

When surgery is considered

Surgery is considered mainly when there are signs of spinal cord compression (myelopathy) or progressive symptoms such as worsening hand function, weakness or unsteadiness. The goal is to relieve pressure on the cord and create more space within the canal, sometimes with fusion to maintain stability. Because myelopathy can progress, timely assessment is important when cord-related symptoms appear. The decision is based on symptoms, examination findings and imaging together.

When to see a spine specialist

Consider seeing a spine specialist if you develop hand clumsiness, difficulty with fine tasks, unsteady walking, or numbness or weakness in the arms or legs — particularly if these are gradually worsening. A sudden deterioration after a neck injury, or any bladder or bowel changes, needs urgent attention. A specialist can determine whether the spinal cord is affected and advise on whether monitoring or treatment is most appropriate.