Spinal canal stenosis

What is spinal canal stenosis?

Spinal canal stenosis is the narrowing of the bony channel that contains the spinal cord and nerve roots. This reduces the space available for these structures. In some people, the narrowing causes nerve or spinal cord compression and symptoms, while others have spinal canal stenosis without significant symptoms.

Stenosis is classified by location:

• Lumbar (lower back): the most common form. It compresses the nerve bundle at the base of the spine, often causing leg pain or cramping when walking.

• Cervical (neck): can narrow the space around the spinal cord and, when the cord is affected, cause problems with coordination, balance, or limb function.

• Thoracic (mid-back): less common, and, when significant, can compress the spinal cord and cause symptoms affecting the legs and lower body.

Stenosis is also classified by cause:

• Degenerative: the most frequent cause, driven by age-related wear, such as thickened ligaments, bone spurs (osteophytes), and bulging discs.

• Congenital: some people are born with a naturally narrow canal, making them more likely to experience symptoms earlier in life.

• Secondary causes: these include changes following previous surgery, spinal tumours, trauma, or conditions that alter the structure of the spine.

The symptoms of spinal canal stenosis depend on where the narrowing occurs and whether the spinal cord or nerve roots are affected. Common symptoms include:

Lumbar stenosis:

• Leg pain, heaviness, tingling, or weakness that develops progressively with walking and is relieved by sitting, squatting, or leaning forward

• Lower back pain, often bilateral

• Symptoms may affect one or both legs, depending on which nerves are affected

• Reduced walking distance over time as stenosis worsens

Cervical stenosis and myelopathy:

• Neck pain and stiffness

• Arm tingling, numbness, or weakness

• Hand clumsiness, difficulty with fine motor tasks such as buttoning clothes or writing

• Balance and gait disturbance, a broad-based unsteady gait

• Urinary urgency or dysfunction in more advanced cases

• In severe myelopathy: progressive spastic weakness of the limbs

Important: Rapidly progressive neurological symptoms including limb weakness, loss of balance, or bladder and bowel dysfunction in the context of cervical stenosis require urgent medical assessment. Spinal cord compression causing myelopathy can cause irreversible neurological damage if not addressed promptly.

Degenerative stenosis develops through cumulative age-related structural changes that progressively reduce the space available for the spinal cord and nerve roots. Contributing causes include:

• Disc wear and bulging: as spinal discs flatten and bulge, they push into the spinal canal from the front.

• Enlarged joints and bone spurs: the small joints in your spine (facet joints) can grow larger or develop bone spurs to cope with stress, taking up space from the sides and back.

• Thickened ligaments: a specific ligament in your spine (the ligamentum flavum) can become thicker and less flexible with age, causing it to buckle inward toward the nerves.

• Slipped vertebrae: known as spondylolisthesis, this happens when one bone in your spine slips forward over another, further tightening the canal.

• Natural anatomy: some people are simply born with a narrower spinal canal, meaning even minor age-related changes can cause symptoms quickly.

• Lifestyle and genetics: obesity puts extra pressure on the spine, speeding up these changes, while your family history often determines how early your joints and discs begin to wear down.

Spinal canal stenosis is detected through spinal imaging, with blood tests providing metabolic and bone health context and helping exclude other causes of similar symptoms.

Spinal MRI MRI is the best tool for diagnosing stenosis. It directly measures the width of your spinal canal and identifies exactly what is causing the narrowing, whether it is bulging discs, bone spurs, or thickened ligaments. It also checks if the spinal cord itself is being damaged (myelopathy), which is critical for preventing permanent injury. Elfcare’s full-body MRI includes the neck and lower back, often catching stenosis before it becomes a major problem.

Blood tests cannot detect spinal canal stenosis directly but identify contributing conditions and exclude alternative causes of similar symptoms. Relevant markers in Elfcare's panel include:

• Lipid profile: helps assess cardiovascular risk when vascular disease is a possible alternative explanation for leg pain during walking.

• CRP: can support the assessment of infection or inflammatory disease when these are suspected.

• HbA1c and glucose: checks for diabetes, which causes nerve damage (neuropathy) that can be easily confused with spinal pressure.

• Vitamin D, calcium and ALP: provide information about bone and mineral metabolism. ALP may be elevated in conditions with increased bone turnover, including Paget’s disease.

• TSH: screens for thyroid issues that cause muscle weakness and pain.

Why early detection matters

Spinal canal stenosis can gradually affect walking ability, mobility, and quality of life. Treatment depends on where the narrowing is located, how severe it is, and the symptoms it causes. Depending on the situation, management may include physiotherapy, exercise, activity changes, pain relief, or other treatments. Some people with persistent or severe symptoms may be considered for surgery.

Cervical stenosis requires particular attention when it causes symptoms of myelopathy, such as worsening balance, hand clumsiness, weakness, or changes in walking. In these cases, timely medical assessment is important to determine whether treatment is needed.

How Elfcare can help

Elfcare's full body MRI covers the cervical and lumbar spine as standard. It can show narrowing of the spinal canal, the structural changes causing it, and whether the spinal cord or nerve roots are being compressed. The findings can also help distinguish spinal canal stenosis from other structural problems, such as disc herniation.

Our blood panel covers the metabolic, bone health, and inflammatory markers needed to identify contributing conditions and exclude alternative diagnoses.

If our MRI or blood tests identify spinal canal stenosis or related spinal findings, we take care of further diagnostics or refer you to the appropriate specialist.