Your back has been sore for a fortnight, and by now several people have told you to get it scanned. The logic feels unassailable: something is wrong, a picture will show what, and then it can be fixed. It is worth knowing that clinical guidelines around the world say the opposite, and that they say it for reasons that have nothing to do with saving money.
What scans find in people who feel fine
When researchers scan the backs of people with no pain at all, they find plenty. Disc degeneration in roughly a third of people in their twenties, and in the large majority by sixty. Bulging discs are common at every age. These findings rise steadily with age in exactly the way grey hair does, and in people who feel nothing whatsoever.
So a scan of your painful back will almost certainly find something. The question the picture cannot answer is whether that something is the reason you hurt. Very often it is not, and it was there for years before the pain arrived.
When imaging genuinely matters
There is a short list of signs that do warrant urgent assessment, and none of them is “it has been sore for a while”. See a doctor promptly if any of these apply to you.
- Pain following significant trauma — a fall, a crash
- Numbness around the groin, or loss of bladder or bowel control
- Progressive weakness in a leg, rather than pain alone
- Fever, unexplained weight loss, or a history of cancer
- Pain that is unrelenting at night and unchanged by position
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What the guidelines recommend instead
For ordinary, non-specific back pain the first-line recommendation is remarkably consistent across countries: explanation, staying active, and exercise. Not bed rest — that recommendation was abandoned decades ago and has aged badly. Not passive treatment alone. Movement, in a dose you can sustain, with enough understanding of what is happening that you are not frightened of your own spine.
That is unsatisfying advice, because it is slow and it asks something of you. But it is what has held up, and the good news buried inside it is that most episodes of back pain improve substantially within weeks — with or without a picture of your discs.
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