Lumbar Spinal Stenosis (Narrowing of the Spinal Canal in the Lower Back)

Lumbar spinal stenosis means the space around the nerves in your lower back has narrowed with age. It often causes leg pain or heaviness when you walk, which eases when you sit or bend forward. Most people manage well without surgery, and when surgery is needed, it usually works well for leg symptoms.

Reviewed by Dr. Kshitij Chaudhary — Last reviewed September 2026

What Is Lumbar Spinal Stenosis?

Your spinal nerves run down a tunnel inside the spine called the spinal canal. In stenosis, this tunnel gets narrower and squeezes the nerves that go to your legs.

It usually happens slowly, over years. Several age-related changes add up:

• Worn discs: The discs between the bones lose height and bulge a little
• Enlarged joints: Arthritis makes the small joints at the back of the spine bigger
• Thickened ligament: The ligament lining the back of the canal thickens and folds inward
• Bone spurs: Extra bone forms around arthritic joints
• A slipped vertebra: Sometimes one bone slides forward over the one below. See Spondylolisthesis (Slipping Vertebra)

Who Gets It?

It is most common after the age of 50. The L4–L5 level is affected most often. Some people are born with a narrower canal, so they get symptoms earlier.

How Serious Is It?

For most people, it is a nuisance rather than a danger. It limits how far you can walk, but it rarely causes lasting harm.

Many people over 60 show some narrowing on their MRI and have no symptoms at all. A narrow canal on your report matters only if it matches your symptoms.

What Symptoms Does It Cause?

Symptoms build up slowly. The most common are:

• Pain, heaviness, cramping or burning in the buttocks and legs when you stand or walk
• Numbness or pins and needles in the legs or feet
• Weakness in the legs
• Lower back pain, though the legs usually bother people more
• Feeling less steady on your feet

The pattern is often the clue. Doctors call it neurogenic claudication:

• You can walk only a certain distance before you have to stop
• Sitting down or bending forward brings relief within a few minutes
• Walking uphill feels easier than walking downhill
• Leaning on a shopping trolley helps you walk further
• Cycling is often easier than walking

Bending forward opens up the canal a little, which is why these positions help.

Is It My Spine or My Circulation?

Poor blood flow to the legs can also cause pain when you walk. The difference is what brings relief:

• Stenosis: You need to sit or bend forward. Standing still is often not enough
• Circulation problems: Standing still for a minute is usually enough

If it isn't clear which one you have, your doctor may check the pulses in your feet or order a blood-flow test.

How Is It Diagnosed?

• Examination: Your doctor asks how far you can walk and what eases it, then checks your strength, sensation, reflexes and balance
• MRI: The most useful test. It shows how narrow the canal is and which nerves are squeezed
• X-rays: These show alignment, arthritis and any slipped vertebra. X-rays taken while bending show whether the bones move
• CT scan: Sometimes used to see the bone in more detail
• Nerve tests: Occasionally, to rule out nerve problems from other causes such as diabetes

Will It Get Worse?

Usually slowly, if at all. Many people stay the same for years, and some improve. Sudden worsening is uncommon.

What matters is how far you can walk and how much your symptoms limit you, not how the MRI looks.

How Is It Treated Without Surgery?

Many people manage well without surgery. Treatment aims to keep you walking and active:

• Staying active: Walk within your comfort, and rest when you need to. Cycling or a stationary bike is a good way to keep fit
• Physiotherapy: Exercises improve core strength, posture and walking distance
• Medicines: Pain relievers and nerve pain medicines can ease symptoms. Do not use anti-inflammatory tablets for more than about 10 days in a row without asking your doctor
• Weight control: A healthy weight takes load off your spine
• Injections: An injection near the nerves can ease leg pain for a while in some people

Physiotherapy does not widen the canal, but it can help you do much more with it.

When Is Surgery Needed?

Surgery is worth considering when:

• Your walking distance is short and keeps you from daily life
• Leg pain continues despite proper non-surgical treatment
• Leg weakness is getting worse

The decision rests on your symptoms and your goals. The MRI alone doesn't decide it.

If you have been advised surgery and aren't sure, you can send your MRI for a second opinion before deciding.

What Does Surgery Involve?

The aim is to give the nerves more room.

• Decompression (laminectomy): Your surgeon removes the bone and thickened ligament pressing on the nerves, keeping as much normal structure as possible
• Minimally invasive decompression: In suitable cases, the same thing is done through a smaller cut with less disturbance to the muscles
• Decompression with fusion: If a vertebra has slipped or the spine is unstable, your surgeon may also join the bones with screws and rods

Surgery is done mainly for leg symptoms. Leg pain and walking distance improve most reliably. Back pain improves less predictably.

How Long Is Recovery?

Most people walk on the day of surgery and go home the next day. You return to light activity within a few weeks. Leg pain often eases quickly. Numbness and weakness take longer, sometimes months, especially if the nerves were squeezed for a long time.

Can I Prevent It?

Not fully, because age is the main cause. Staying active, keeping your core strong, not smoking and keeping a healthy weight all help your spine age better.

What Questions Should I Ask My Doctor?

• Which level is narrowed, and how much?
• Are my leg symptoms coming from my spine or my circulation?
• Is there a slipped vertebra or any instability?
• What can I try before surgery?
• If I need surgery, is decompression enough, or do I need a fusion too?
• How far should I expect to walk after recovery?

Treatments We Offer for This

• Laminectomy (Lumbar Decompression)
• Minimally Invasive Decompression
• TLIF (Spinal Fusion Surgery)

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About Dr. Kshitij Chaudhary

This page was written by Dr. Kshitij Chaudhary, a fellowship-trained spine surgeon at P.D. Hinduja Hospital, Mumbai, trained in complex spine surgery at Harvard Medical School (Beth Israel Deaconess) and the Twin Cities Spine Center, Minneapolis. 🏃🏾About Dr. Chaudhary

This information is for general education and does not replace a consultation with your doctor.