Quick answer. Spinal stenosis is a narrowing of the bony spinal canal that puts pressure on the spinal cord and/or the nerves running through it, most often in the lower back or neck and usually caused by age-related “wear and tear.” It’s common in older adults, and most people are managed successfully with physiotherapy, staying active and pain relief, with surgery reserved for those whose symptoms are significant or getting worse.
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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
A useful clue for the lower-back type: leg symptoms that come on with walking or standing and ease when you sit or lean forward (for example, resting on a trolley) – a pattern called neurogenic claudication.
What spinal stenosis is
The spinal cord and the nerves branching from it travel down a bony tunnel formed by the stacked vertebrae. Spinal stenosis is a narrowing of the spaces within the spine – either the main central canal or the smaller side channels where nerves exit – which puts pressure on the spinal cord and the nerves running through it. As the space shrinks, the cord and nerves become crowded and can be compressed, producing pain, numbness, tingling, weakness or clumsiness depending on which level is affected. It most often affects the lower back (lumbar) or the neck (cervical), and it usually develops gradually over years as part of the wear that comes with age.
Symptoms – lower back (lumbar) stenosis
The hallmark of lumbar stenosis is neurogenic claudication: aching, cramping, heaviness, numbness, tingling or weakness in the buttocks and legs that comes on with walking or standing and is relieved by sitting or bending forward. Leaning forward opens the canal a little, which is why many people can walk further while pushing a trolley or shopping cart, or cycle comfortably, yet struggle to walk upright for long. Lower back pain is often present too. Symptoms typically build slowly and may come and go, and some people notice their walking distance gradually shortening.
Symptoms – neck (cervical) stenosis
Narrowing in the neck can cause neck pain and, if a nerve root is pinched, pain, numbness or weakness travelling into an arm. More importantly, if the spinal cord itself is compressed, it can affect the arms and legs together: numbness, weakness or clumsiness in the limbs, changes in fine hand movements (difficulty with buttons, coins, keys or handwriting), and balance problems with an unsteady walk. Because cord compression in the neck can worsen over time and neck manipulation should be avoided, these symptoms deserve prompt review by a doctor.
Causes and who is at risk
Spinal stenosis is usually caused by the age-related wear that affects most spines over time. As discs lose height, the body forms bony growths (bone spurs), the small facet joints enlarge with osteoarthritis, and the ligaments that support the spine thicken – together narrowing the canal. Bulging discs can add to the crowding. Other contributors include a previous back or neck injury, and being born with a naturally narrower canal, which can lead to symptoms at a younger age. The condition becomes more common with older age, and is a frequent cause of leg and back symptoms in later life.
How it is diagnosed
Diagnosis begins with your history and a physical and neurological examination, in which the doctor asks about the pattern of your symptoms and checks your strength, sensation, reflexes, balance and walking. Imaging – usually an MRI scan – is the most helpful test, because it shows the spinal cord, the nerves and the soft tissues, and reveals where and how much the canal is narrowed. Where MRI is unsuitable, a CT scan or other imaging may be used. Scan findings are always interpreted alongside your symptoms, since some narrowing is common with age and does not always cause problems. Additional tests may be arranged to exclude other conditions that can mimic stenosis, such as nerve or circulation problems in the legs.
Treatment – usually starting conservatively
Most people are managed well without surgery, and treatment usually starts with conservative care:
- Staying active within limits: keeping gently active rather than resting completely, and modifying activities to work around what brings symptoms on;
- Physiotherapy and exercises: a programme to strengthen the trunk and legs, improve flexibility and posture, and build walking tolerance – often including forward-bending (flexion) exercises that many people find comfortable;
- Pain relief: medication as advised by your doctor to keep you moving;
- Steroid injections: an injection around the affected nerves may help some people with significant nerve pain, as one part of a wider plan.
Many people manage their symptoms successfully with these measures and never need an operation.
When surgery is considered
Surgery is generally considered when symptoms are severe or progressively worsening, when there is significant weakness, or when the symptoms are badly affecting quality of life despite conservative treatment. The main operation aims to create more space for the cord and nerves (a decompression, such as removing part of the bone or thickened ligament), and in some cases the spine is stabilised at the same time with a fusion if it is unstable. For cord compression in the neck, surgery is more often recommended earlier to protect the spinal cord. A spine specialist – an orthopaedic (spine) surgeon or a neurosurgeon – will explain the options, likely benefits and risks for your particular situation.
Living with it and self-care
Day to day, several habits can help you stay comfortable and keep moving. Staying active within your limits – walking, swimming or cycling as tolerated – helps maintain strength and fitness. Reaching and keeping a healthy weight reduces load on the spine. Regular exercises for core and leg strength, flexibility and posture, ideally guided by a physiotherapist, are worthwhile. Good posture and simple ergonomic adjustments at work and home ease strain, and pacing your activities – breaking up long periods of standing or walking with short rests, and using forward-leaning positions that relieve you – helps you do more with less discomfort.
When to see a doctor
See your GP if leg or back symptoms are limiting your walking or daily activities, or are not improving with self-care, so you can be assessed and referred for physiotherapy or imaging if needed. Seek prompt review for symptoms suggesting neck cord compression – clumsy hands, changes in fine movements, or new unsteadiness on your feet. And seek emergency care at A&E or by calling 995 for the red flags above: new bladder or bowel control problems, saddle numbness around the back passage, genitals or inner thighs, or severe or rapidly worsening weakness or numbness in the legs. HealthHub has further general information on back and spine health for Singapore readers.
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Sources
- OrthoInfo (AAOS) — Lumbar spinal stenosis: causes, neurogenic claudication, the “better leaning forward” pattern, MRI, treatment ladder.
- OrthoInfo (AAOS) — Cervical spondylotic myelopathy: cord compression, hand/balance symptoms, often surgical, never manipulate.
- NHS — Spinal stenosis: symptoms, self-care and when to get help.
- Cleveland Clinic — Spinal stenosis: causes, symptoms and treatment (corroboration).
