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What Your Back MRI Report Means

Disc degeneration, a bulge, an annular fissure, and facet arthropathy show up on a lot of MRI reports. They also show up in people who have no back pain. A 2015 review of people without back pain put disc degeneration at 37% of 20-year-olds and 80% of 50-year-olds. For disc bulges it was 30% and 60%.

A common finding is not automatically the cause of your pain. The report still matters when a finding fits your symptoms and exam, or when a clinician is looking for something specific.

My MRI showed degeneration at L5-S1 and some at L4-L5. No major hernia. I had those findings and I still trained my back.

What the words on the report mean

How common these findings are without pain

A 2015 systematic review pooled 33 studies covering 3,110 people with no back pain and estimated how often each finding appears at different ages:

By 50, most people who feel fine have some disc degeneration on a scan. These are modeled estimates from grouped studies and cannot predict one person's scan, but they show how often age-related changes appear without symptoms.

Older studies found the same pattern. In a 1994 study of 98 people without back pain, 52% had a bulge at one or more levels, 27% had a protrusion, and only 36% had normal discs at every level. In a 1990 study of 67 people who had never had back pain, about 57% of scans in those aged 60 or older were abnormal. The 1990 authors concluded that scan findings must be matched to age and symptoms before surgery is considered.

Findings are more common in people with pain

A companion 2015 meta-analysis compared adults aged 50 or younger with and without back pain. Disc bulges, degeneration, extrusions, protrusions, Modic 1 changes, and spondylolysis were all more common in the group with pain. A finding is real information, especially when its location matches nerve symptoms and what the exam shows.

What a report alone cannot say is whether a finding that is also common in people without pain is causing your pain or is a bystander. Your history and exam answer that. Ask the clinician who ordered the scan to connect the report to them.

Many herniations shrink without surgery

A 2015 systematic review looked at people with lumbar disc herniations who were treated without surgery and had at least two scans. The herniation shrank on follow-up imaging at these rates:

The findings that sound worst on a report shrank most often. Complete resolution was reported in 43% of sequestrations and 15% of extrusions. A smaller herniation on a scan does not guarantee less pain, and pain can improve with no visible change. Leg or foot weakness that is getting worse, new pain, tingling, numbness or weakness in both legs, or new saddle, sexual, bladder or bowel changes mean go to emergency care now, whatever an earlier scan showed. Severe pain that lasts can still call for a surgical assessment.

Early routine scans did not help

A 2009 meta-analysis of 6 randomized trials with 1,804 patients compared immediate imaging with usual care for low back pain with no sign of a serious cause. Scanning early did not improve pain or function at up to 3 months or at 6 to 12 months. The results apply most to recent back pain seen in primary care. They do not argue against a scan ordered to check a specific concern or to plan a procedure.

When a scan is the right call

A clinician may order imaging promptly when back pain comes with:

• New numbness, tingling or change in feeling in the saddle area, new changes in sexual function, new bladder or bowel changes, new pain, tingling, numbness or weakness in both legs, leg or foot weakness that is getting worse, or a recent serious accident. These need emergency care now.
• Other new weakness or numbness in one leg or foot.
• Fever or chills alongside the back pain, weight loss you cannot explain, or a history of cancer.
• A recent smaller fall or knock, especially if you are older, have osteoporosis, or take long-term steroids.
• Pain that is constant at rest, worse at night, and not tied to movement.

The red-flag checklist has the timing for each. Whether you need a scan, and how soon, is for the clinician who examines you to decide.

What to do with the report you have

Bring it to a clinician who has examined you and ask: does anything on this scan change what I am allowed to do? Ask which findings fit your symptoms and which are common age-related changes. The appointment questions cover the rest of that visit.

If you are cleared for exercise, gradual strength work can be part of care. The back-extension progression is what I did. My experience does not show that this exercise suits every diagnosis, and a pain log never overrules nerve symptoms or a clinician's advice.

Common questions

Is a bulging disc on an MRI serious?

It depends on your symptoms, your exam, and why the scan was done. Disc bulges are common in adults with no back pain: one systematic review estimated them at 30% of 20-year-olds and 60% of 50-year-olds. A clinician who has examined you can say whether yours matters.

Can a herniated disc shrink without surgery?

Often, yes. A systematic review of people treated without surgery found herniations shrank on follow-up scans in 96% of sequestrations, 70% of extrusions, 41% of protrusions, and 13% of bulges. A smaller herniation does not guarantee less pain, and some cases still need a surgical assessment.

Should I get an MRI for lower back pain?

In trials of people with no sign of a serious cause, scanning early did not improve pain or function. A scan makes sense when a clinician suspects a specific cause or when the result would change treatment. Red flags do not wait for a scan decision: emergency care now for the emergency signs, a clinician today for the others.

What does degenerative disc disease mean?

It describes age-related changes in a spinal disc, such as drying out or losing height. These changes become more common with age and often appear in people with no pain. The term alone does not tell you what is causing your symptoms.

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