Do I Need an MRI for My Back Pain?

It is the most common question we hear in a first back pain appointment: "Shouldn't I get a scan first?" It feels like the responsible thing to do. In most cases it is not, and understanding why will probably save you money and a good deal of anxiety.

Scans find things in people who feel fine

When researchers scan the spines of adults with no back pain at all, they find plenty. Disc degeneration shows up in roughly a third of people in their twenties and in the large majority by their sixties. Disc bulges, annular tears and facet joint changes follow the same pattern — they accumulate quietly with age in people who never develop symptoms.

This matters because it means finding a bulging disc on your scan does not establish that the bulging disc is causing your pain. It may simply be a normal age-related change that happened to be photographed while something else was hurting.

When imaging genuinely helps

There are clear situations where a scan changes what happens next, and we screen for all of them at your first appointment:

• Progressive neurological signs — worsening weakness, numbness spreading, or loss of bladder or bowel control
• A history of significant trauma, particularly with osteoporosis or long-term steroid use
• A history of cancer, unexplained weight loss, fever or night pain that does not ease with position
• Symptoms that have not improved at all after a properly delivered course of treatment
• You are being considered for surgery or an injection, where the surgeon needs to see the anatomy

These are sometimes called red flags. They are uncommon, but they are the reason a proper assessment starts with screening questions rather than exercises.

The cost of scanning too early

Early imaging for uncomplicated back pain is associated with worse outcomes, not better ones. People who get scanned early tend to report more pain, take longer to return to work and are more likely to end up having surgery — without better results.

The likely mechanism is straightforward. Reading that you have "degenerative disc disease" and a "bulge" makes your back feel fragile. You move less carefully, you avoid loading it, the muscles deconditioning, and the whole thing becomes more sensitive. The words on the report change your behaviour.

What we do instead

A physiotherapy assessment works out which movements provoke your symptoms and which relieve them, tests the nerves, and screens for the red flags above. That usually gives a clearer picture of what to do next than an image does, because it tells us how your back behaves rather than how it looks.

From there we settle the irritable phase with hands-on treatment, then load the spine progressively so it tolerates more. If you do not respond as expected, that is precisely when imaging becomes useful — and we will refer you for it.

“The right question is not "what does my scan show" but "what does my back do, and what makes it better".”

If you have already had a scan

Bring it. Reports are useful context, and we will go through yours with you and explain in plain terms which findings are likely relevant and which are the spinal equivalent of grey hair. Most people leave that conversation noticeably less worried than they arrived.