Are Schmorl’s nodes serious?

Usually not. Most are old, silent and found by accident on a scan done for something else. The version associated with pain is the one with fluid in the bone around it, and a report describes that separately when it is present.

Can a Schmorl node cause sciatica?

No. Sciatica comes from pressure on a nerve root, and a Schmorl node goes into the bone of the vertebra — the opposite direction from the nerves. If sciatica is present, something else in the report is the candidate.

The dent in the bone is permanent, but that is not the part that matters. What can settle is the reaction around it: an acute node with marrow oedema typically becomes a chronic, walled-off one over months to years, and stops being associated with pain.

Do they need treatment?

Not in themselves. Where an acute node with marrow oedema is judged to explain someone’s pain, what is treated is the pain — and that is a clinical decision made with the symptoms in front of the person making it, not from the scan.

Does having several mean my spine is deteriorating?

Not on its own. Multiple nodes are common and mostly reflect the shape and loading of that spine over years. Deterioration is judged by comparing studies over time and by what the person can actually do.

Findings explained

Schmorl’s nodes: what they are on a spine report

Read Your Scan Editorial Team·Last updated 7 September 2026·6 min read

Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →

Sagittal T2 MRI of the lumbar spine — A real sagittal T2 of the lumbar spine — the view this finding is read on. The vertebral bodies are the blocks down the front; the flat surface at the top and bottom of each one is the endplate a Schmorl node dents.Real exam · Stillwaterising · CC0 1.0

The short answer

A Schmorl node is a small dent where disc material has pushed up or down into the bone of the vertebra next to it, instead of backwards towards the nerves. Most are old, painless and found by accident on a scan done for something else. They are one of the most common incidental findings on a spine MRI.

The disc pushes into the vertebra, not into the spinal canal. A Schmorl node cannot press on a nerve — that is what makes it different from a herniation.
They are common. Large imaging studies find them in a substantial share of adults, most of whom have no back pain.
Most are long-standing and inactive. A report calling one chronic or well-corticated is describing something that finished happening years ago.
A small minority are acute, with swelling in the bone around them, and those can hurt. The report describes them differently.
They are named after the pathologist who described them; the name says nothing about severity.

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What a Schmorl node actually is

A spinal disc sits between two vertebrae, and the flat surface of bone at the top and bottom of each vertebra is called the endplate. A disc herniation is disc material pushing backwards, out of the disc space and towards the spinal canal. A Schmorl node is the same material going in a different direction: upwards or downwards, through the endplate, into the body of the vertebra itself.

The result is a small dent in the bone with disc material sitting in it. On an MRI it looks like a notch taken out of the otherwise straight line of the endplate. That direction is the single most important fact about the finding, and it is the one the name hides: it has gone into bone, away from everything that could be compressed.

They are named after Christian Georg Schmorl, the pathologist who described them in the 1920s from post-mortem specimens — which is itself a clue to how common and how silent they usually are. The name carries no grading and no implication of severity.

Sagittal MRI of the spine showing depressions in the vertebral endplates — A real sagittal spine MRI whose source study is labelled as showing Schmorl nodes. They are the small concave dents in the otherwise flat upper and lower surfaces of the vertebral bodies, where disc material has pressed up or down into the bone instead of backwards.Real exam · J. Lengerke · CC BY-SA 3.0

Why your report mentions one

Schmorl nodes are among the most frequently reported incidental findings on spine imaging. Studies of people scanned for reasons unrelated to their back find them in a large share of adults, and they turn up in people of every age, including adolescents.

The radiologist reports one for the same reason they report everything else visible: the report is an inventory of the anatomy in the field of view. A finding that is present, common and usually irrelevant still gets a sentence, because leaving out something visible is not an option. That sentence then arrives on a portal with no context, and reads like a diagnosis.

Ordinary loading over years is the usual explanation — the endplate is the weakest part of the joint and gives way slowly.
They cluster in the lower thoracic and upper lumbar spine, which is where the mechanics concentrate.
They travel with disc degeneration and with Modic changes at the same level, which is why all three often appear in one paragraph.
Some appear after an injury, and a few are associated with conditions affecting the endplate in adolescence.

Old and quiet, or new and sore

This is the distinction that decides whether the finding means anything for you, and the report usually contains it — in words that are easy to read past.

What the report says	What it is describing
Chronic Schmorl node / well-corticated	The bone has finished reacting and walled the dent off with a rim of dense bone. That takes time. This is the common, silent version.
With surrounding marrow oedema / marrow signal change	Fluid in the bone around it — the sign of something recent or still settling. This is the version associated with pain, and it is the one worth asking about.
Acute Schmorl node	Explicitly recent. Uncommon, and described as such because it changes what the finding means.
Multiple Schmorl nodes	Several levels involved. Frequency alone is not severity; it usually reflects the shape and loading of that person’s spine.
With Modic type 1 change at the same level	The endplate reaction and the node are being described together. Modic type 1 is the fluid-and-inflammation form, so this is the combination most often linked with symptoms.

Where the report says nothing about marrow oedema, it is describing a quiet finding. Silence about the bone around the node is itself information.

Sagittal T2 MRI of the lumbar spine with degenerative disc changes — A different lumbar study with degenerative change. Schmorl nodes travel with disc degeneration, which is why they so often appear in a report that mentions both.Real exam · Ptrump16 · CC BY-SA 4.0

Why it is not the herniation people are afraid of

The word most people reach for when they read about a Schmorl node is "herniation", because the technical description says intravertebral disc herniation. That is accurate and it is misleading at the same time.

A posterior disc herniation goes backwards, into a space that also contains the thecal sac and the nerve roots. It can compress them, and that is why it can cause leg pain, numbness or weakness.
A Schmorl node goes vertically, into solid bone. There are no nerves in that direction. It cannot compress a nerve root, and it cannot cause sciatica.
The two can exist at the same level in the same person and be entirely separate findings.

So a report describing a Schmorl node and nothing else has, in effect, described something that cannot produce the symptom most people are worried about when they go looking for the word.

What is worth asking

Does the report mention marrow oedema or signal change around it? That is the difference between a finding and a possible explanation.
Is it at the level my pain is at? A node in the mid-thoracic spine has nothing to do with low back pain.
Is anything else described at that level — a disc bulge, Modic change, height loss? Those usually carry more of the clinical weight.
Is there an older scan? A node that is identical to one from five years ago is settled by definition.

Back pain is assessed on symptoms, examination and how things change over time. An incidental finding on a scan has never been a reason for a procedure on its own.

Frequently asked questions

Are Schmorl’s nodes serious?: Usually not. Most are old, silent and found by accident on a scan done for something else. The version associated with pain is the one with fluid in the bone around it, and a report describes that separately when it is present.
Can a Schmorl node cause sciatica?: No. Sciatica comes from pressure on a nerve root, and a Schmorl node goes into the bone of the vertebra — the opposite direction from the nerves. If sciatica is present, something else in the report is the candidate.
Do they go away?: The dent in the bone is permanent, but that is not the part that matters. What can settle is the reaction around it: an acute node with marrow oedema typically becomes a chronic, walled-off one over months to years, and stops being associated with pain.
Do they need treatment?: Not in themselves. Where an acute node with marrow oedema is judged to explain someone’s pain, what is treated is the pain — and that is a clinical decision made with the symptoms in front of the person making it, not from the scan.
Does having several mean my spine is deteriorating?: Not on its own. Multiple nodes are common and mostly reflect the shape and loading of that spine over years. Deterioration is judged by comparing studies over time and by what the person can actually do.

When you want a second read of the images themselves

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Words on this page

Each of these has its own page in the report glossary.

Report glossary, A–Z →

Sources

Patient-facing procedure descriptions (MRI, CT, X-ray, ultrasound)RadiologyInfo.org — Radiological Society of North America & American College of Radiology
MRI scan — overview, how it is performed and resultsNHS (United Kingdom)
ACR Appropriateness Criteria and practice parameters for reportingAmerican College of Radiology

Keep reading

Modic changes type 1, 2 and 3 on a spine MRIWhat Modic changes are, what the three types actually describe, why type 1 is the one associated with pain, and what the grading does and does not predict.What “effacement of the thecal sac” means on a spine MRIThe thecal sac is the fluid-filled sleeve around the spinal nerves. Effacement means something is pressing on its edge — what that does and does not imply.What “facet arthropathy” and “facet hypertrophy” meanArthritis of the small joints at the back of the spine. What hypertrophy is describing, why it is nearly universal after middle age, and when it explains pain.What “joint effusion” means on an MRI reportExtra fluid in a joint. Why a small effusion is normal, what "trace" and "moderate" are measuring, and why the effusion is a clue rather than the problem.What “straightening of the cervical lordosis” meansYour neck X-ray or MRI says the normal curve is straightened or reversed. What that describes, why muscle spasm and the scan position cause it, and why the finding alone rarely explains pain.What “retrolisthesis” means on a spine reportOne vertebra sitting slightly backwards on the one below. What the grades mean, why it usually comes from disc wear rather than injury, and when it matters.How to read a lumbar spine MRILevels, discs and nerve roots: what bulge, protrusion, extrusion, stenosis and foraminal narrowing actually describe — and what a lumbar MRI does not cover.How to read a radiology reportA radiology report has five parts and only one is the answer. What each section means, which sentence to read first, and what the hedging words are doing.What a lumbar spine MRI shows, and what the report meansA lumbar MRI shows the discs, spinal canal, nerve roots and facet joints, level by level. What bulge, stenosis and degenerative change mean.What a cervical spine MRI shows, and what the report meansA cervical MRI shows the neck vertebrae, the discs, the spinal cord and the nerve roots. What the common findings on a neck MRI report mean.

Read Your Scan is informational only — not a medical diagnosis, and not a substitute for a licensed radiologist or your doctor. This page explains what a report says and what a radiologist looks at; it cannot tell you what your own images show. If you have urgent symptoms, seek care.