Back pain is not always from your back
Back pain is often felt in the back, but the pain generator is not always a damaged disc, trapped nerve or weak core. Hip joints, sacroiliac joints, nerves, kidneys, bowel, pelvis, stress physiology, sleep loss and deconditioning can all produce or amplify pain that feels like "my back". The priority is to spot red flags, then match the pattern to the right examination and treatment rather than chasing a scan result in isolation.
Key facts
- NICE says clinicians should consider alternative diagnoses when new or changed low back pain appears, including cancer, infection, trauma and inflammatory disease.1
- NICE also says not to routinely offer imaging in non-specialist settings for low back pain with or without sciatica.1
- Brinjikji and colleagues reviewed imaging in 3,110 pain-free people and found degenerative findings were common even without back pain, including disc degeneration in 37% of 20-year-olds and 96% of 80-year-olds.5
- The 2018 Lancet low back pain series argued that most low back pain is best understood through interacting biological, psychological and social factors, not a single structural defect.3
- Exercise therapy has moderate-certainty evidence for chronic low back pain compared with no treatment, usual care or placebo, but effects are usually modest and need to be matched to the person.7
Why the scan is not the whole answer
An MRI can be useful when there are red flags, severe or progressive nerve signs, surgical planning questions, or specialist uncertainty. It is much less useful when it is used as a general fishing expedition. Spines age. Discs dry out. Facet joints change. Bulges appear. Many of those findings are present in people with no pain at all.
That does not mean scan findings are irrelevant. Brinjikji and colleagues also found some degenerative findings are more common in people with pain than pain-free controls, especially under age 50.6 The point is interpretation. A disc bulge can matter if it matches the side, level and nerve pattern. It is much less convincing if it is an incidental finding in the wrong place.
The Lancet series pushed against two errors: dismissing back pain as "nothing" and over-medicalising it as a broken part. Low back pain can be severe and disabling even when no single tissue explains it. NHS guidance also notes that most back pain improves within a few weeks, while rarely it can signal fracture, cancer or infection.2 Pain is produced by the nervous system using input from tissue, inflammation, movement, stress, sleep, fear, prior injury and context.3
This is why "it is not from your back" is not the same as "it is all in your head". It means the back may be one part of a bigger system.
Common reasons back pain is not just the back
Hip joint pain: hip arthritis or femoroacetabular problems can refer pain to the buttock, groin, thigh and lower back. A hip that cannot rotate well can force the lumbar spine to compensate.
Sacroiliac and pelvic girdle pain: pain around the dimples of the lower back, buttock or pelvis can come from the SI region, especially after pregnancy, trauma, asymmetrical loading or inflammatory disease. Diagnosis is clinical because imaging is often imperfect.
Nerve pain: sciatica is leg pain from nerve irritation, often with tingling, numbness or weakness. NHS guidance describes sciatica as pain, tingling, numbness or weakness that starts in the lower back or bottom and travels down the leg.8
Inflammatory back pain: ankylosing spondylitis and axial spondyloarthritis often start younger, improve with movement, wake people in the second half of the night, and come with morning stiffness. NHS information notes ankylosing spondylitis can cause back pain and stiffness that improves with exercise and is not relieved by rest.9
Kidney, bowel and pelvic causes: kidney stones, kidney infection, endometriosis, ovarian problems, bowel inflammation and abdominal conditions can refer pain to the back. These usually come with other clues such as fever, urinary symptoms, blood in urine, abdominal pain, bowel change, pelvic pain, or pain unrelated to movement.
Nervous-system sensitivity: after pain persists, the nervous system can become more protective. Stress, poor sleep, fear of movement and repeated flare-ups can amplify pain. This does not mean the pain is imaginary. It means the alarm system has become easier to trigger.
Patterns that change the next step
Use the pattern to decide what needs checking. The same pain location can mean different things depending on timing, spread, neurological signs and systemic symptoms.
| Pattern | Possible driver | What to ask about | Why it matters |
|---|---|---|---|
| Pain mainly in groin, front thigh, buttock or with putting socks on | Hip joint referral | Hip range of motion, X-ray if clinically appropriate, physio or orthopaedic pathway | Treating only the lumbar spine may miss the main mechanical driver |
| Leg pain below knee, tingling, numbness or weakness | Sciatica or nerve root irritation | Neurological exam: reflexes, strength, sensation, straight-leg raise | Progressive weakness or cauda equina symptoms need urgent assessment |
| Morning stiffness, night waking, better with movement, younger onset | Inflammatory back pain | Family history, psoriasis, uveitis, IBD, HLA-B27, CRP, rheumatology referral if suspicious | Inflammatory disease needs a different pathway from mechanical back pain |
| Back pain with fever, urinary symptoms or blood in urine | Kidney infection or kidney stone | Urine test, temperature, abdominal or flank exam, urgent care if severe | This is not a physio-first problem if infection or obstruction is possible |
| Pain with weight loss, cancer history, infection risk or trauma | Serious spinal pathology | Urgent medical assessment and imaging if indicated | Rare causes are uncommon but high consequence |
| Persistent pain with poor sleep, fear of movement and repeated flares | Nervous-system sensitivity and deconditioning | Graded activity, sleep review, pain education, physio, psychological support if needed | More scans may not solve the sensitisation loop |
The broader health library and insights section can help you connect pain with sleep, stress and inflammation, but the first step is still pattern recognition.
What to ask your GP or physio
NICE recommends risk stratification, advice, self-management and activity continuation for low back pain, with more complex support for people at higher risk of poor outcome. Manual therapy should only be considered as part of a treatment package that includes exercise, with or without psychological therapy.1 Foster and colleagues' Lancet review makes the same broad point: care should prioritise active, non-surgical approaches for most people, while avoiding low-value overuse of imaging and procedures.4
That means a good consultation should not be just "here are some exercises". It should include red-flag screening, neurological exam if there are leg symptoms, hip screening, review of inflammatory features, medication safety, work demands, sleep, activity pattern and what you are afraid to do. For some people, imaging is exactly right. For many, it is less useful than a careful exam plus a plan.
- Do I have any red flags that mean I need urgent assessment or imaging?
- Can you check leg strength, reflexes and sensation if I have pain, numbness or tingling down the leg?
- Could this be hip, sacroiliac, kidney, pelvic, inflammatory or nerve-related rather than only lumbar muscle pain?
- Can I self-refer to NHS community MSK physiotherapy, or do I need a GP referral in my area?
- What should make me seek urgent help: bladder or bowel change, saddle numbness, progressive weakness, fever, trauma or night pain?
- If imaging is not recommended now, what finding would change that decision?
What to do next
Stay active within tolerable limits unless a clinician has told you not to. Bed rest usually makes ordinary back pain worse. Start with movements that do not flare symptoms heavily: walking, gentle hip motion, short mobility blocks, low-load strength work or a physiotherapist-guided plan. For chronic pain, the Cochrane review by Hayden and colleagues found exercise probably helps compared with no treatment or usual care, but the average effect is modest, so the best programme is the one you can progress consistently.7
Track response, not perfection. Which movements centralise pain? Which send it further down the leg? Does morning stiffness improve after moving? Does sitting make it worse? Does sleep change it? Did a new bladder or bowel symptom appear? This is the kind of information that changes clinical decisions.
Urgent signs: get urgent medical help for new bladder or bowel problems, numbness around the genitals or back passage, new sexual dysfunction with back pain, progressive leg weakness, fever with severe back pain, major trauma, unexplained weight loss, or pain with a history of cancer. If symptoms are sudden or severe, call 999 or go to A&E.
Back pain is real even when the scan does not show a dramatic injury. The goal is not to find someone to blame, whether disc, posture or stress. The goal is to identify the pattern that tells you what to do next.
References
- NICE, 2020. Low back pain and sciatica in over 16s: assessment and management. NICE guideline NG59. link
- NHS, 2026. Back pain. link
- Hartvigsen J, Hancock MJ, Kongsted A, Louw Q, Ferreira ML, Genevay S, Hoy D, Karppinen J, Pransky G, Sieper J, Smeets RJ, Underwood M, 2018. What low back pain is and why we need to pay attention. The Lancet. link
- Foster NE, Anema JR, Cherkin D, Chou R, Cohen SP, Gross DP, Ferreira PH, Fritz JM, Koes BW, Peul W, Turner JA, Maher CG, 2018. Prevention and treatment of low back pain: evidence, challenges, and promising directions. The Lancet. link
- Brinjikji W, Luetmer PH, Comstock B, Bresnahan BW, Chen LE, Deyo RA, Halabi S, Turner JA, Avins AL, James K, Wald JT, Kallmes DF, Jarvik JG, 2015. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. American Journal of Neuroradiology. link
- Brinjikji W, Diehn FE, Jarvik JG, Carr CM, Kallmes DF, Murad MH, Luetmer PH, 2015. MRI findings of disc degeneration are more prevalent in adults with low back pain than in asymptomatic controls: a systematic review and meta-analysis. American Journal of Neuroradiology. link
- Hayden JA, Ellis J, Ogilvie R, Malmivaara A, van Tulder MW, 2021. Exercise therapy for chronic low back pain. Cochrane Database of Systematic Reviews. link
- NHS, 2026. Sciatica. link
- NHS, 2026. Ankylosing spondylitis. link
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This article is educational and does not constitute medical advice, diagnosis, or a treatment recommendation. Medication uses described as “off-label” are not licensed for that purpose in the UK and should only be considered under qualified clinical supervision. Always speak to your GP, pharmacist, or a registered specialist before starting, stopping, or changing any treatment. If you have severe or alarm symptoms - unintentional weight loss, blood in your stool, difficulty swallowing, persistent vomiting, a fever, or severe pain - seek urgent medical care.