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Most back pain resolves within six weeks, and an MRI early in the course often causes more harm than good by finding changes that were never the problem.
Why scans early on are usually unhelpful
Disc bulges, degenerative changes and mild disc prolapse are found on MRI in a large proportion of people who have no back pain at all — around a third of thirty-year-olds and the majority of sixty-year-olds. Finding one in a person with pain does not establish that it is the cause.
Worse, being shown a report full of alarming terms makes people move less, fear activity and recover more slowly. Guidelines therefore advise against imaging in the first six weeks of ordinary back pain in the absence of warning features.
Warning features that do require prompt imaging
- Loss of bladder or bowel control, or numbness in the saddle area — this is an emergency
- Progressive weakness in a leg or foot drop
- Back pain following significant trauma
- Fever with back pain
- Unexplained weight loss, or a history of cancer
- Pain that is constant, worse at night and not relieved by any position
- Onset before 20 or after 55 years of age
- Long-term steroid use, or known osteoporosis
Worth knowing
Loss of bladder or bowel control with back pain is cauda equina syndrome — go to an emergency department the same hour. Delay causes permanent damage.
What to do in the first six weeks
- Stay active — bed rest beyond one or two days delays recovery and weakens muscle
- Continue walking and normal activity within the limits of pain
- Use heat for muscle spasm; ice can help in the first 48 hours after an acute strain
- Take simple pain relief regularly for a short period so that you can keep moving
- Start core and back strengthening exercises once acute spasm settles
- Correct sitting posture and set up your work surface at the right height
- Sleep on a firm mattress with a pillow under the knees when lying on your back
Preventing recurrence
Back pain recurs in the majority of people, and what reduces recurrence is not avoiding movement but building tolerance to it. Core strengthening — the deep abdominal and back muscles — is the best-evidenced preventive measure, followed by weight reduction and general fitness.
Lifting technique matters: bend the knees and hips rather than the back, keep the load close to the body, avoid twisting while lifting, and get help for anything genuinely heavy. For farm and construction work, alternating tasks and taking short breaks reduces cumulative load.
When surgery is considered
Surgery is indicated for cauda equina syndrome as an emergency, for progressive neurological weakness, and for disabling leg pain from nerve compression that has not settled after six to twelve weeks of adequate conservative treatment with imaging that matches the symptoms.
Surgery for back pain alone, without leg symptoms and without a clear structural cause, has poor outcomes. If an operation is proposed for pure back pain, a second opinion is entirely reasonable.
Key takeaways
- Around 90% of back pain settles within six weeks without imaging or surgery.
- Disc bulges are common in people without any pain — a scan finding is not automatically the cause.
- Stay active; prolonged bed rest slows recovery.
- Bladder or bowel involvement with back pain is an emergency requiring same-hour assessment.
A note on medical advice
This article is general health education written and reviewed by the Department of Orthopaedics at SIMS. It is not a substitute for an examination, a diagnosis or the advice of your own treating doctor, and it cannot account for your history, medicines or reports. If a symptom is sudden or severe — chest pain, stroke symptoms, breathing difficulty, serious injury, seizures or heavy bleeding — call 9281862028 or come straight to the emergency department instead of reading further.
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