A scan of a healthy back, in a person with no pain at all, usually looks abnormal. That is the fact that changes what back pain means — and almost nobody is told it.

What a normal spine looks like on a scan

These are pooled figures from imaging studies of people with no back pain at all. Pick an age, guess how common you think each finding is in that group, and compare. The point is not that scans are useless — it is that a finding shared with most of the pain-free population is a poor candidate for the cause of one person's pain.

Why the cause usually cannot be named

• In most episodes there is no single injured structure to point at. Discs, joints, muscles, ligaments and nerves all share nerve supply and all refer pain to the same region, so the pain rarely maps onto one part. “Non-specific low back pain” sounds like a failure of diagnosis; it is a diagnosis, and it is the common one.
• Hurt is not the same as harm. Pain is an output of the nervous system, not a readout of tissue damage, and the two come apart in both directions: severe damage with little pain, severe pain with no damage. This is not the same as saying the pain is imagined — it is real, and understanding the mechanism is what makes moving again possible.
• Most episodes settle substantially within weeks, whatever is done to them. That is why almost any treatment can look effective, and why the useful question about a treatment is whether it beats time, not whether people improved after it.
• Recurrence is normal and is not a relapse into damage. Backs that have hurt once tend to hurt again; a second episode is not evidence that the first one was mistreated or that something is crumbling.
• The strongest predictors of a long, disabling course are not structural. Fear of movement, believing the back is damaged and fragile, low mood, job dissatisfaction and stopping activity predict outcome better than anything visible on imaging.
• Posture and lifting technique matter far less than people are told. There is no single correct sitting position, no evidence that a specific lifting style prevents back pain, and no support for the idea that one bad lift breaks a healthy back. Varying position and staying strong matter more than any one posture.

The small number of situations that are a different problem

Almost all back pain is not dangerous. The exceptions are few, mostly recognisable, and worth knowing precisely rather than vaguely — vague worry is what produces both unnecessary scans and missed emergencies.

• Cancer history, or new back pain after 50 with weight loss. Unrelenting pain that is worse at night and not eased by any position, in somebody with a past cancer or unexplained weight loss, needs assessment rather than reassurance.
• Fever, or infection risk. Back pain with fever, or in somebody who injects drugs, has a recent bloodstream infection, is immunosuppressed, or has had recent spinal surgery or injections, can be a spinal infection.
• Significant trauma, or minor trauma in fragile bone. A fall from height or a road crash at any age, or a modest knock in somebody with osteoporosis or on long-term steroids, can fracture a vertebra.
• Progressive weakness or numbness in one leg. Sciatica that is getting weaker — a foot that drags or gives way, rather than just hurting — needs review, not waiting.
• Under 20 or over 50 with a first episode, pain that has not eased at all over weeks, or systemic illness alongside it, shifts the balance toward looking properly.
• Morning stiffness for over half an hour in a young adult, better with exercise and worse with rest, suggests inflammatory back pain rather than mechanical — a different condition with a different treatment, often missed for years.

How a scan can make things worse

• The findings are nearly universal with age. Disc degeneration, bulges, protrusions, annular fissures, facet arthritis and small slips are all common in people with no pain, and their prevalence rises steadily with every decade. Reporting them is accurate; treating them as the cause usually is not.
• Being told your spine is degenerating changes behaviour. People who receive early imaging for non-specific back pain report more pain and worse function later, have more procedures, and are off work longer — not because the scan injured them but because of what they then believed and stopped doing.
• Incidental findings start cascades. A bulge that would never have caused trouble gets an injection, then a referral, then an operation, with all the risk of each step and little chance of improving a problem it was not causing.
• The words matter clinically. “Degeneration” means age-related change, not decay; “bulge” is usually a normal-looking disc shape; “wear and tear” is a phrase worth asking to have translated. Ask directly: is this finding common in people my age who have no pain?
• Scanning is genuinely useful when the answer changes what happens. Red flags, planned surgery, a nerve problem that is not settling, a suspected fracture, infection or tumour: these are imaging questions. “I want to know what is wrong” usually is not, because the scan will not tell you.
• A normal scan is not reassuring either, if you were expecting an answer. The relief lasts days. What actually reduces the fear is understanding why the pain does not need a structural explanation.

What actually helps

1. Keep moving, and keep going to work if you can, adjusting rather than stopping. Bed rest was standard advice for decades and turned out to make pain and disability worse. Two days of taking it easier is different from two weeks of protecting the back.
2. Use pacing, not boom-and-bust. Find the amount you can do without a flare, do a bit less than that consistently, and add roughly ten per cent a week. The pattern of doing nothing for three days and then everything on Saturday is what keeps the cycle going.
3. Get strong in a way you will keep doing. Walking, general strength work, yoga, pilates, swimming, cycling — the evidence favours exercise broadly and does not crown one type. Adherence beats optimality, so pick what you will still be doing in three months.
4. Treat sleep and stress as part of the pain, because they change how much it hurts. Poor sleep amplifies pain the next day, and pain wrecks sleep; breaking into that loop is real treatment, not a consolation prize.
5. Use medication as a short-term tool, with its ceiling in mind. Anti-inflammatories help modestly for short periods with real stomach, kidney and cardiovascular risks; paracetamol alone performs poorly for back pain; muscle relaxants help briefly and sedate. None of these is a plan on its own.
6. Hands-on treatment and heat can make moving easier, which is their value: manual therapy, massage and heat give short-term relief and work best as a way into activity rather than as the treatment itself.
7. If it is still dominating life after six weeks, ask for a proper programme, not another scan: supervised exercise combined with a psychological approach has the best evidence in persistent back pain, and being offered it is not a suggestion that the pain is in your head.

What to be sceptical about

• Long-term opioids. They do not outperform simpler options for chronic back pain over months, and they carry tolerance, dependence, constipation, falls, low mood and increased pain sensitivity. Short courses in acute severe pain are a different conversation from a repeat prescription for years.
• Repeat scans for unchanged pain. If nothing new has happened neurologically, a second scan usually finds the same age-related changes and adds a new worry.
• Expensive mattresses, chairs, belts and insoles. Medium-firm is a reasonable default and comfort is the only useful guide; there is no evidence a special mattress or a back belt prevents or cures back pain.
• Prolonged rest, avoiding bending, and giving up activities “to protect it”. These are the mechanisms by which a short episode becomes a long one.
• Anyone who tells you your spine is out of place and needs putting back. Vertebrae do not slip in and out; the manipulation may feel good, but the explanation attached to it is wrong and the belief it plants is the harmful part.
• Surgery for non-specific back pain without a clear target. Operations have a place for nerve compression that is not settling, instability and specific structural problems; for ordinary back pain without a target they perform poorly, and fusion is not a cure for a painful degenerate disc.

Sciatica, which is a different thing

• Sciatica is nerve pain down the leg, typically below the knee, often with pins and needles or numbness in a strip. Back pain with some ache in the buttock is not sciatica, and the distinction matters because the course and the treatment differ.
• Most sciatica improves without surgery, though it is slower and more painful than ordinary back pain: many people are substantially better within six to twelve weeks, and disc protrusions shrink on their own.
• Weakness is the finding that changes the plan, not the severity of the pain. A leg that is getting weaker, a dropping foot, or spreading numbness needs assessment sooner.
• Surgery for persistent sciatica speeds up recovery rather than changing the eventual destination for most people, which makes the timing a genuine choice: faster relief against operative risk.
• Spinal stenosis behaves differently again: leg pain and heaviness on walking that eases when you sit or lean forward, in an older adult. Walking further by leaning on a trolley is a classic clue.
• Nerve pain medicines are disappointing here. Gabapentin and pregabalin have little evidence of benefit in sciatica and cause dizziness and drowsiness; they are not the obvious answer they are often presented as.

When it has been going on for months

• Persistent pain often reflects a sensitised system rather than ongoing damage. The alarm has become easier to set off, which explains pain that spreads, varies with sleep and stress, and does not match any single structure. It is real, and it is also modifiable.
• The goal moves from cure to capacity. Getting back to walking, working, lifting the shopping and sleeping through most nights is achievable well before pain reaches zero, and chasing zero first is what keeps people stuck.
• Flare-ups are part of the pattern, not a verdict. A plan that includes what you will do in a flare — less, not nothing, for a few days — prevents the spiral back into rest and fear.
• Ask what a pain-management programme actually involves, because the name puts people off. It is graded activity, education about the mechanism, and practical help with sleep, pacing and fear, delivered together — the combination with the best evidence.
• Deconditioning does most of the visible damage. Months of guarding produce weakness, stiffness and worse balance, all of which hurt more and confirm the belief that the back is broken.
• Depression and pain travel together and treating only one usually fails. Low mood raises pain, pain lowers mood, and naming both is not an admission that the pain is psychological.

Getting a useful appointment

• Lead with the red-flag review, present or absent. Saying explicitly that the saddle area is normal and urination is normal saves time and shows exactly where the boundary is.
• Describe function, not just intensity. “I can walk twenty minutes, I cannot sit for a meeting, I have stopped lifting my toddler” is more useful than a number out of ten, and it gives something to measure against in six weeks.
• Ask for the plan and the timeline. What should improve, by when, and what would make you come back sooner — those three answers are worth more than a diagnosis label.
• If imaging is offered, ask what will change. A scan that will not change the treatment is a scan that can only add a worry.
• If you are told your spine is degenerating, ask how common that is at your age in people with no pain. The answer is usually “very”, and hearing it is often the most therapeutic thing in the consultation.
• Bring the work question, because staying at work with adjustments beats stopping and returning, and a specific conversation about duties gets a specific answer.

The drill: 16 decisions

Sixteen ordinary moments — a scan report read on a phone, a numb patch noticed in the bathroom, a week of lying flat, an offer of a stronger tablet. Most have an instinctive answer that makes things worse, and one is a genuine emergency. Pick your move; every answer explains why.

The card

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