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Annular Fissuring: What It Means, Symptoms and Next Steps

Radiologist reviewing a lumbar MRI scan

Annular fissuring means there is a separation or defect in one or more layers of the annulus fibrosus, the tough outer ring of a spinal disc. StatPearls describes an annular fissure or tear as exactly that: a deficiency of the annular layers. On a report it can be a minor, age-related finding or part of a painful problem, and the MRI image alone often cannot tell you which. This guide explains the term, the symptoms, what recovery looks like and what to do when pain does not settle.

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TL;DR

  • Annular fissuring is a separation in the outer ring of a spinal disc. “Annular fissure” and “annular tear” are often used for the same finding, though some radiology authors draw a line between them.
  • Many people with fissures or related MRI signs have no back pain at all, so the finding alone does not prove it is your pain source.
  • Pain can arise when nerve endings grow into the damaged area or when the disc material pushes out and presses on a nerve.
  • Most first-line care is conservative: anti-inflammatory medication and low-impact physical therapy. Persistent or worsening symptoms deserve a closer workup.
  • If your pain continues despite normal-looking or ambiguous results, objective biological information, such as immune-related markers, can add to the conversation with your doctor.

Table of Contents

What annular fissuring actually is

Each spinal disc has a soft, gel-like center (the nucleus pulposus) held in by a ring of layered fibers (the annulus fibrosus). A fissure is a gap between those layers. The fibers may separate in a radial, transverse or concentric direction, and the separation can involve one layer or several, as a 2023 MRI review of thoracic annular fissures frames it in general terms.

The term appears on MRI reports of the neck, mid-back and low back. The lumbar spine, especially the lower levels such as L4-L5 and L5-S1, is where most patients meet it, because those discs carry the most load.

Annular fissure vs. annular tear

The two terms are close, and many clinicians treat them as the same. Radiopaedia notes that many authors prefer “fissure” because “tear” suggests an acute injury. In severe trauma with disc disruption, the term “disc rupture” is used instead.

Some radiology researchers go further. A 2025 paper in the Journal of Clinical and Medical Imaging proposes this distinction:

Feature Annular fissure Annular tear
Typical cause Degenerative, age-related Traumatic
T2 MRI signal Lower hyperintensity Higher hyperintensity
Location in the annulus Inner two-thirds Outer one-third

The same authors argue that using the words interchangeably, without attention to signal and location, can lead to misdiagnosis. In practice, ask your doctor which sense your report uses and whether the finding fits your history, such as a specific injury or gradual onset.

Why a fissure does not always mean pain

This is the most important point for anyone reading an MRI report at home. Disc findings are common in people who feel fine.

  • A 2003 study in Bone & Joint found a high-intensity zone (HIZ, a bright spot on MRI often linked to annular fissures) in 12 of 50 people (24%) without low back pain. The authors concluded that an HIZ does not reliably indicate a painful disc.
  • A 2005 study in the European Journal of Radiology found annular tears on cervical MRI in 37% of 30 volunteers with no symptoms.
  • A 2018 review of 3,185 discs in 637 patients found HIZ in 36.16% of symptomatic patients versus 26.96% of asymptomatic ones. That is a statistically significant gap, but it also means more than a quarter of people without symptoms had one.

Spine Radiology adds that the likelihood of a symptomatic disc rises when the HIZ appears alongside disc degeneration, Modic changes and clinical symptoms that match the location. In other words, the image gains meaning only when it lines up with your pain pattern and exam.

That is not a reason to dismiss your pain. It is a reason to avoid assuming the fissure is the whole story, especially if treatment aimed at the disc has not helped.

Symptoms of annular fissuring

There is no single signature symptom. What you feel depends on whether the fissure is irritating nerve tissue, how much disc material is involved and where in the spine it sits.

Local pain. According to StatPearls, chronic pain from annular fissures can come from granulation tissue or the in-growth of nerve endings, usually seen near the dorsal root ganglion. People often describe a deep, aching pain in the low back that worsens with prolonged sitting, bending or lifting.

Radiating pain. The same source notes that a fissure can allow the nucleus pulposus to extrude, which is a disc herniation, and compress an adjacent nerve. That compression is what produces leg pain, numbness or tingling.

Symptoms at L5-S1

The L5-S1 disc sits at the base of the spine, where the lumbar spine meets the sacrum. A fissure there may produce low back pain and, if a nerve is involved, pain that travels into the buttock, back of the thigh or foot. The research behind this guide does not give a level-specific symptom list, so the pattern is best confirmed by an exam. A clinician can match your symptoms to the nerve root involved and decide whether the MRI finding fits.

Signs that need prompt care

Seek urgent medical attention for loss of bladder or bowel control, numbness in the groin or saddle area, or progressive leg weakness. These are the features of cauda equina syndrome and serious neurologic deficit, which the WFNS Spine Committee identifies as the exceptions to a conservative-first approach. Earlier imaging is also recommended when there is a motor deficit, according to the WFNS recommendations on lumbar disc herniation.

How annular fissuring is diagnosed

MRI is the main tool. On T2-weighted images, the normal annulus is dark. A fissure appears bright because of increased water content, as StatPearls explains. A CT myelogram can show nerve root or cord compression, but CT cannot identify the edema of an annular fissure.

Timing matters too. For symptoms consistent with a lumbar disc herniation and no neurologic deficit, the WFNS recommendations suggest radiological assessment when pain persists after 6 to 12 weeks.

What the MRI cannot reliably do is date the problem. A serial MRI study followed annular tears over time. All 10 enhancing tears still enhanced at follow-up (mean 17.2 months), and high T2 signal persisted in 23 of 26 tears (mean 21.9 months). The authors concluded the imaging could not determine how recent a tear was. So a bright spot on your scan may be old, and it may have nothing to do with this month’s flare-up.

How annular fissuring is diagnosed

Can an annular fissure heal?

It depends on what kind of finding it is. According to the 2025 Khurana paper, fissures tend to progress gradually with disc desiccation as part of natural aging. True traumatic tears typically heal clinically within about 12 months, and sometimes show healing on imaging, if there is no further injury.

Note the word “clinically.” Symptoms can fade while the scan still shows the finding, which fits the serial imaging data above. Judge recovery by how you function, not by whether the MRI image changes.

For people whose leg pain comes from a disc herniation, a 2022 review by Soar and colleagues reports that symptoms resolve without intervention for most, with the majority improving within 4 to 6 weeks of conservative management.

Treatment options

First-line: conservative care

StatPearls lists non-steroidal anti-inflammatory medications and low-impact physical therapy as the mainstay for symptomatic fissures without herniation. Some clinicians suggest local transforaminal steroid injections may ease symptoms faster. The WFNS group likewise recommends conservative treatment first when there is no cauda equina syndrome or serious neurologic deficit, and notes NSAIDs may significantly improve acute low back and sciatic pain.

Talk to your doctor or pharmacist before using NSAIDs if you have kidney disease, stomach ulcers, heart disease or take blood thinners. For radiating nerve pain, Soar and colleagues say simple analgesics such as NSAIDs or a weak opioid may be offered, while gabapentinoids, other anti-epileptic drugs, oral corticosteroids and benzodiazepines show no overall evidence of benefit and do show evidence of harm. If you are taking one of those drugs, do not stop it on your own. Review it with the prescriber.

First-line: conservative care

When surgery enters the picture

Surgery concerns herniation with nerve compression, not a fissure by itself. The ISASS policy guideline supports discectomy as medically necessary when indicated for lumbar disc herniation with radiculopathy, and reports it is superior to continued nonsurgical care when symptoms last more than 6 weeks. For primary discectomy patients with large annular defects (6 mm or wider), it also describes clinical evidence that bone-anchored annular closure reduces recurrent herniation and reoperation. A spine surgeon decides whether any of this applies to you.

What if your annular fissure is not healing?

Persistent pain is common enough that it is worth a plan rather than a wait. These steps follow from the evidence above.

  1. Check that the finding matches your pain. Given how often fissures and HIZ appear without symptoms, ask your clinician whether the level, side and pattern of your pain fit the MRI. Matching findings carry more weight.
  2. Review what you have already tried. The conservative options above are first line. If you have tried them for the 6 to 12 weeks the WFNS recommendations mention without relief, request a re-evaluation.
  3. Ask about the full picture. Disc degeneration, Modic changes, nerve compression and other pain drivers can coexist. A second look at the report and exam may reveal what the first missed.
  4. Do not rely on the scan to tell you whether healing is happening. Because tears can look the same on repeat MRI for 1 to 2 years, track function, sleep and activity tolerance instead.
  5. Consider the biology behind persistent pain. When structural findings do not explain symptoms, or treatment aimed at the disc has not helped, the next question is what is driving the pain signal itself.

Where objective biology fits in

An MRI shows structure. It does not show whether your body is mounting an immune response that keeps pain going. That gap is why many people with chronic back pain leave appointments with an image and no clear explanation.

The Pain Signal Test™ takes a different angle. It is a blood test that measures immune system markers linked to chronic pain, built on peer-reviewed DNA research from a leading U.S. university. It is designed to give patients and providers objective biological data to guide the conversation about next steps, rather than guesswork.

Order the Pain Signal Test™

If your annular fissuring has not explained your pain, or you are tired of treatment that does not match what you feel, a simple blood draw can give you something concrete to bring to your doctor. Our approach looks at immune factors that are often overlooked in chronic pain cases.

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Patients typically pay nothing out of pocket when covered by Medicare or PPO insurance, and we verify coverage for you. Learn about The Pain Signal Test™ and see whether you are eligible. Your provider can also order it for you.

Our perspective

Most people we hear from have already seen an MRI report. Many were told they have a fissure, a bulge or degeneration, and then left to wonder why treatment has not worked. The image is a start, but we believe chronic pain deserves more than a picture of the spine.

Pain is not only mechanical. The immune system takes part in how pain begins and how it persists, and that part is rarely measured in routine care. We built The Pain Signal Test™ on peer-reviewed DNA research so that patients and providers can look at it directly, with objective data from a blood sample.

We do not replace your spine specialist, your physical therapist or your primary care doctor. We give them and you another piece of evidence for choosing the next step, and we work to make access easy, with coverage verification and typically no out-of-pocket cost for eligible Medicare and PPO patients.

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FAQ

Is annular fissuring serious?

Often it is not. The studies cited above found fissure-type findings on MRI in roughly a quarter to over a third of people without symptoms. It becomes a concern when it matches your pain pattern, or when it comes with nerve compression or the warning signs of weakness or loss of bladder or bowel control. See a clinician promptly for any of those.

Is an annular fissure the same as an annular tear?

They are frequently used interchangeably, and Radiopaedia notes that many authors favor “fissure” since “tear” implies acute injury. Some researchers distinguish them by cause, MRI signal and location. Your radiologist’s report and your history determine which applies to you.

Can a fissure in the disc go away on its own?

Traumatic tears typically heal clinically within 12 months, according to the 2025 Khurana paper, while degenerative fissures tend to progress slowly with aging. Symptoms often improve even when the MRI finding remains, so function is the better measure of progress.

What are the symptoms of an L5-S1 annular fissure?

Expect low back pain, with possible buttock, thigh or foot pain if a nerve is irritated or compressed. A clinical exam is needed to connect your symptoms to the right nerve root and to the MRI.

When should I get an MRI for back pain?

For symptoms consistent with disc herniation and no neurologic deficit, the WFNS recommendations suggest imaging if pain persists after 6 to 12 weeks, and earlier if there is a motor deficit. Your doctor will decide based on your exam.

Sources