Disc space narrowing

3 things to know first

1. It is a measurement of space. It often reflects reduced disc height.
2. It is not the whole diagnosis. The cause and symptoms require context.
3. The level matters. Reports usually identify which two vertebrae are involved.

What it is

A disc sits between neighboring vertebral bodies. Disc space narrowing means the gap occupied by that disc appears reduced on imaging. It often accompanies disc degeneration, but the phrase itself describes the appearance rather than explaining why it happened.

Why it appears on your report

X-ray and CT show the distance between vertebrae; MRI shows the disc itself. Radiologists may also mention adjacent bone spurs, endplate changes, or narrowing around nerves.

How serious is it

Mild narrowing is common and may cause no symptoms. If there is nerve compression or a history suggesting infection or injury, the clinician considers the full pattern rather than the gap alone.

When to seek care urgently

Get urgent assessment for severe back pain with fever, progressive weakness, or new bladder or bowel problems.

What usually happens next

1. Identify the level and compare prior scans if available.
2. Review accompanying disc, bone, and nerve findings.
3. Discuss symptoms and whether any further evaluation is needed.

Further reading

• RadiologyInfo — Spine MRI
• NIAMS — Back Pain