Your Gut Is Reaching Your Spine | The Angry Gut, Chapter 11

Crohn's disease back pain

Crohn’s Disease Back Pain: What Scans Miss and What to Measure

Crohn’s disease can cause back pain, largely through inflammation. Across 71 pooled studies of inflammatory bowel disease, about 10% of people had sacroiliitis, inflammation where the spine meets the pelvis, and 3% had ankylosing spondylitis; the pain tends to follow an inflammatory pattern rather than a mechanical one.

Back pain in someone with Crohn’s disease or colitis is usually scanned as a mechanical problem. The inflammatory pattern that points back to the bowel lives in the history, not the MRI.

Crohn’s disease back pain often gets the same workup as anyone’s back pain: an MRI, physical therapy, perhaps an injection. The scans come back showing wear that most adults carry, and the bowel diagnosis sitting in the same chart never enters the conversation.

The video above, Your Gut Is Reaching Your Spine, is Chapter 11 of The Angry Gut by Dr. Gurpreet Singh Padda, MD, MBA, MHP, and Ami Michelle Grimes. It follows a man whose colitis and eleven years of back pain were never discussed together. The question here is about measurement: what shows bowel inflammation reaching the spine, what a Measura [Cardiometabolic and Autonomic Health Analysis] visit cannot show, and what it can.

How often does Crohn’s disease affect the spine?

This part is not a theory. Across 71 pooled studies of people with inflammatory bowel disease, about 10% had sacroiliitis, inflammation where the spine meets the pelvis, 3% had ankylosing spondylitis and 13% had arthritis in the limbs. When researchers combined 52 studies covering 352,454 patients, roughly a quarter (24%) had some complication beyond the bowel; the share was 35% in Crohn’s disease and 27% in ulcerative colitis.

Genes sort the risk. In ulcerative colitis, people carrying the HLA-B27 gene had a relative risk of 22.17 for developing ankylosing spondylitis. Rats engineered to carry that human gene develop gut and joint inflammation, but animals raised with no bacteria at all developed neither. That is animal work, a proof of principle, and it says the bacteria of the first brain are needed for the joint disease in a susceptible body.

What does Crohn’s back pain feel like?

Inflammatory back pain has a signature, and it is found by asking, not imaging. Pain that wakes you in the second half of the night. Morning stiffness lasting longer than half an hour. Pain that eases when you move and worsens when you rest, which is backward for a mechanical back. And the question almost nobody asks: has anyone linked it to your bowel?

Meanwhile the MRI is crowded with findings that do not sort people. A Modic change, a signal change in the bone beside a disc, turns up in roughly 6% of people without pain, against a median 43% among people who hurt. Type 1 raised the odds of back pain about fourfold (4.01); a Modic change of unstated type came in at 1.62, an estimate that includes no effect at all. A scan shows where the spine has changed. It rarely tells anyone why it hurts.

What Measura does not measure

Be clear about the limits. Measura does not do imaging, so there is no MRI or X-ray of the sacroiliac joints. It does not do colonoscopy, stool testing or microbiome sequencing. It does not run genetic tests such as HLA-B27. Those belong to your physician, a gastroenterologist or a rheumatologist, ordered elsewhere. Anyone offering to read your bowel’s effect on your spine from one stool census is selling more certainty than the science holds.

What Measura can show in the same person

What a testing visit adds is the terrain the inflammation lives in. Laboratory panels capture metabolic blood work that can reflect insulin resistance and metaflammation, the slow-burning inflammation of metabolic disease. Bioimpedance body composition separates fat from muscle, compartments a bathroom scale lumps together. Heart rate variability measures the beat-to-beat variation that reflects how the autonomic nervous system balances stress and recovery, which matters in someone whose pain breaks up sleep night after night.

None of those numbers diagnoses spinal arthritis. They answer a different question: how hot the terrain is running while specialists look at separate organs. For how insulin resistance ties into long-running pain, see chronic pain and metabolic health; for sleep, heart rhythm and related complaints, see autonomic symptoms.

Do bacteria in the spinal disc cause back pain?

Sequencing has found bacterial DNA in nearly every disc tested, even in donor discs that looked normal on MRI, which retires the idea that discs are sterile. Whether those bacteria cause pain is a separate matter. A disc has no blood supply, so a pill barely reaches it. In a large antibiotic trial for back pain with Modic changes, the researchers’ own bar for a meaningful change was 4 points; the result was 1.6, and drug-related side effects ran 56% against 34%. A 2026 trial of the same drug found adverse events in 40.0% of people taking it and 23.5% on placebo, without a pain benefit at twelve months.

Do not start antibiotics on your own for back pain. What is established is inflammation traveling from bowel to spine, so getting the bowel disease under control is part of caring for the back.

The first brain end of the problem

The book calls the gut the first brain and the skull the second, and the spine sits downstream of the first. Several drivers keep that first brain inflamed. Diets heavy in acellular carbohydrates leave the short-chain fatty acid producers underfed, and those compounds are what the gut lining burns. Industrial seed oils feed metaflammation. Night pain that breaks up sleep belongs on the list too. Then the social driver: a system that sends the bowel to one specialist and the spine to another, so the patient ends up as the only person holding the whole file.

The barrier those drivers wear down is the subject of the gut wall, and malabsorption from the same bowel drives the low vitamin D covered in what low vitamin D means.

What should you ask your doctor about Crohn’s and back pain?

If you live with Crohn’s disease or ulcerative colitis and your back hurts, ask whether anyone has looked at your sacroiliac joints specifically. Ask whether an HLA-B27 test or a rheumatology referral makes sense for your pain pattern. Ask what your inflammatory markers have done across years, not just this month. And ask for the metabolic and autonomic picture to be measured, so the terrain is documented instead of assumed. Unmeasured is unmanaged. The full study list sits in the Chapter 11 Deep Dive.

Frequently asked questions

Can Crohn’s disease cause back pain?

Yes, largely through inflammation. Across 71 studies of inflammatory bowel disease, about one person in ten had sacroiliitis and 3% had ankylosing spondylitis, and complications outside the bowel were most common in Crohn’s disease. The back pain tends to follow an inflammatory pattern rather than a mechanical one. A starting point for matching symptoms to measurements is who should be tested.

How is inflammatory back pain different from ordinary back pain?

Inflammatory back pain usually wakes people in the later part of the night, brings morning stiffness lasting over half an hour, and feels better once you get moving but worse after sitting still. Mechanical back pain tends to run the opposite way. Write the pattern down before your appointment, because a scan will not record it. Help organizing that conversation is in questions worth asking your doctor.

Can a Measura test show whether my bowel is affecting my spine?

No single test can, and Measura does not do imaging, colonoscopy, stool tests or genetic tests like HLA-B27. What it can measure is the surrounding terrain: metabolic blood work, body composition and autonomic function, which your physician weighs alongside the specialist workup. A plain overview of the test library is in what Measura actually measures.

Will antibiotics fix back pain if bacteria are in the disc?

The evidence does not support that for most people. A large trial found a difference well below its own threshold for mattering to patients, with more side effects on the drug, and a 2026 trial found no pain benefit at twelve months. A disc has no blood supply, so medication barely reaches it. Never start or stop a medication on your own. Reading any single result in context is covered in understanding your results.

Should someone with ulcerative colitis and back pain ask about HLA-B27?

It is a fair question for your physician. In ulcerative colitis, carrying HLA-B27 was linked to a relative risk of 22.17 for ankylosing spondylitis, though only a few studies reported the gene. Your physician orders that test; it is not one Measura performs. Inflammation and metabolic risk often travel together, as insulin resistance and metabolic health explains.

Where is Crohn’s back pain usually felt?

The inflammatory kind centers on the sacroiliac joints, where the spine meets the pelvis. Across 71 pooled studies of inflammatory bowel disease, about 10% of people had sacroiliitis and 3% had ankylosing spondylitis, while 13% had arthritis in the limbs. Ask whether anyone has looked at your sacroiliac joints specifically, because a general spine scan may not answer that question.

How do you relieve back pain from Crohn’s disease?

Start at the source. What is established is inflammation traveling from the bowel to the spine, so getting the bowel disease under control is part of caring for the back. Ask your physician about the sacroiliac joints, an HLA-B27 test or a rheumatology referral, and about your inflammatory markers across years. Do not start antibiotics on your own; the disc trials did not show a meaningful benefit.

Why doesn’t my MRI explain my back pain?

Because the MRI is crowded with findings most adults carry. A Modic change, a signal change in the bone beside a disc, turns up in roughly 6% of people without pain and a median 43% of people who hurt. A scan shows where the spine has changed; it rarely tells anyone why it hurts. The inflammatory pattern that points to the bowel lives in your history, not the image.

Measure the Terrain Around the Pain

Ask about laboratory panels, body composition and heart rate variability testing so the metabolic and autonomic picture is documented alongside your specialist care. Results go to your physician.

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References

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