Back Pain Algorithm · Reasoning GP

The full reasoning pathway — sort every back pain into the 3 Ns (Nasty / Nerve-root / Non-specific), screen hard for the serious causes, then treat most as self-limiting mechanical pain while never missing cauda equina, MSCC, fracture, infection or AAA.StartDecisionInvestigateActionReferStop / Admit

Presentation · the 3 Ns (NICE NG59)Low back pain

Sort into Nasty (red flags), Nerve-root (radicular/stenosis), or Non-specific (85–90%). History: leg-vs-back pain, neurology, systemic features, trauma, cancer/osteoporosis risk. Examine spine + neurology. Do not image in primary care for non-specific pain.

Step 1 · Safety — "Nasty": screen red flagsSerious spinal pathology?

Cauda equina — saddle anaesthesia, new bladder/bowel dysfunction, bilateral sciatica, reduced anal tone
Cord compression / MSCC — progressive bilateral weakness, UMN signs, cancer history, thoracic pain (sensory level is a late sign — refer before it appears)
Malignancy — age >50, known cancer, weight loss, pain worse at rest/night
Infection — fever, IVDU, immunosuppression, recent spinal procedure · Fracture — trauma, or minor trauma + osteoporosis/steroids/age >70 · AAA

YES — red flag

Stop · escalateEmergency

Cauda equina / cord compression / MSCC → immediate referral for emergency MRI + neurosurgery/oncology (MSCC hotline). Infection → same-day bloods + imaging. Fracture → same-day X-ray/CT. AAA → emergency.

NO — benign

Step 2 · StratifySTarT Back + pattern

Use STarT Back for chronicity risk. Spot the inflammatory pattern (young, morning stiffness >30 min, improves with exercise, alternating buttock pain) → ?axial spondyloarthritis.

Step 3 · which of the 3 Ns?

Non-specific

Mechanical (85–90%)

Pain ± referral to buttock/thigh, no nerve-root signs, normal neurology. Self-limiting in most.

Nerve-root

Sciatica / stenosis

Radicular leg pain > back pain, dermatomal, +ve straight-leg raise; or neurogenic claudication (stenosis) eased by flexion.

Inflammatory

Axial SpA

Insidious, age <45, night pain waking 2nd half of night, prolonged morning stiffness, good NSAID response → rheumatology.

Step 7 · manage

Step 7 · Action — analgesia + stay activeMost settle within 6 weeks

Core message: reassure, stay active, avoid bed rest; self-management + exercise; address yellow flags (psychosocial barriers to recovery).
Mechanical pain: NSAID at lowest effective dose/shortest time (ibuprofen/naproxen + PPI cover); topical NSAID; paracetamol alone not recommended as sole agent. Consider short muscle relaxant (diazepam ≤5–7 d) for severe spasm only.
Radicular/neuropathic: amitriptyline or duloxetine; gabapentin/pregabalin per NICE caution. Physiotherapy; consider epidural/specialist if severe and persistent.
Stay-at-work / graded return advice; group exercise, manual therapy as part of a package. Do not offer routine imaging, opioids long-term, or spinal injections for non-specific pain.

Step 6 · escalation thresholds

Step 6 · ReferEscalation thresholds

Emergency cauda equina, cord compression / MSCC, fracture with cord risk, spinal infection.
2WW · NICE NG12 unexplained back pain + weight loss aged 60+; thoracic spine pain with a known primary cancer or no mechanical cause → suspected-cancer pathway (consider myeloma screen: FBC, ESR, calcium, protein electrophoresis if bony pain).
Rheumatology inflammatory back pain / axial SpA. MSK / spinal radiculopathy or disabling pain not settling at 6 weeks; consider MRI only if surgery/injection is contemplated.

Step 8 · modify & rehab

Step 8 · Lifestyle & self-managementRecovery, not rest

Keep active & keep working where possible · structured exercise / physiotherapy · weight management · smoking cessation (disc health) · pacing and ergonomic/posture advice · psychological support / CBT for persistent pain with high distress · fracture-risk (FRAX/DXA) and bone protection if fragility fracture.

Step 9 · safety-net

Step 9 · Safety-net & follow-upWhen to come back

Same-day / 999 if numbness around the back passage/genitals, difficulty passing or controlling urine/bowels, or new weakness in both legs (cauda equina). Urgent if fever with severe pain, or progressive leg weakness. Review: reassess at 2–6 weeks; if not improving, re-screen red flags and reconsider the diagnosis before imaging.

⚠️ Cauda equina cannot wait: bilateral sciatica, saddle anaesthesia or new bladder/bowel dysfunction needs same-day emergency MRI — ask about these in every back-pain consultation and document the answer.

Safety

Screen for Red Flags — Exclude Serious Spinal Pathology First

Done

Before managing as musculoskeletal back pain, exclude sinister causes. Ask directly about each red flag category.

Cauda Equina Syndrome Bilateral leg weakness/numbness, saddle anaesthesia, new bowel/bladder dysfunction → 999 / Same-day MRI

Spinal Cord Compression Progressive bilateral leg weakness, upper motor neuron signs (clonus, hyperreflexia), thoracic pain + neuro symptoms → Same-day ED / MRI

Malignancy Age >50, known primary cancer, unexplained weight loss, pain worse at rest / night, thoracic pain → 2WW suspected cancer referral

Spinal Infection Fever, IV drug use, immunosuppression, recent spinal procedure, constant severe pain → Same-day bloods + imaging

Vertebral Fracture Sudden onset after trauma OR age >70 / osteoporosis / prolonged steroids with minor trauma → Same-day X-ray / CT

Aortic Aneurysm Age >65, male, hypertensive, pulsatile abdominal mass, tearing pain radiating to back → 999 — do not delay

Inflammatory Arthropathy (AS) Age <40, onset <45, morning stiffness >1hr, improves with exercise, buttock pain alternating sides, wakes at night → Routine rheumatology

Epidural Abscess / Haematoma Severe constant back pain + fever + progressive neurological deficit → 999 — neurosurgical emergency

Cauda equina syndrome is the single most important diagnosis to exclude — delay beyond 24–48 hours correlates with permanent bladder/bowel dysfunction. NICE and BSR guidance mandate same-day assessment. Malignancy accounts for ~1% of back pain in primary care but is disproportionately over-represented in medicolegal cases where the diagnosis was delayed. Spinal infection (discitis/osteomyelitis) is rare but catastrophic if missed: mortality ~2–17%, neurological morbidity ~40% without prompt treatment. Aortic dissection/AAA can mimic back pain and carries >80% mortality if ruptured — always consider in the right demographic. Missing any of these constitutes a patient safety incident.

Diagnose

Confirm the Diagnosis — Targeted History

Done

Characterise the pain to guide classification and treatment. Use the SOCRATES framework with specific back-pain prompts.

Onset & Mechanism

Sudden (trauma, disc prolapse) vs insidious (degeneration, malignancy). Lifting/twisting mechanism common in mechanical LBP. Ask about preceding activity.

Site & Radiation

Localised lumbar → mechanical. Radiation to buttock/thigh → referred. Below knee + dermatomal distribution → radiculopathy (L4/L5/S1). Saddle area → cauda equina.

Character

Aching / stiffness → musculoskeletal. Shooting / burning → neuropathic. Constant / boring / worse at rest → sinister (malignancy, infection).

Severity (NRS 0–10)

Document baseline pain score. Guides treatment intensity and follow-up. >7/10 may warrant stronger analgesia and earlier review.

Aggravating / Relieving

Worse with movement, better with rest → mechanical. Worse at rest / night → inflammatory or sinister. Better with exercise → inflammatory (AS).

Associated Symptoms

Leg weakness / numbness, bladder / bowel change, fever, weight loss, fatigue. Each significantly alters the differential and urgency.

Psychosocial (Yellow Flags)

Fear-avoidance beliefs, catastrophising, low mood, workplace stress, previous sick leave for back pain — ask with STarT Back Tool (9-question validated screen). Predicts chronicity.

Occupation & Function

Manual labour vs sedentary. Time off work already taken. Ability to perform ADLs (dress, walk >100m, stairs). Critical for fit-note decisions.

The STarT Back Screening Tool (Keele) is NICE-recommended (NG59) and stratifies patients into low / medium / high risk of chronicity. High-risk patients (score ≥4 + psychosocial subscale ≥4) need early combined physical and psychological intervention — not just analgesia. Yellow flags (psychosocial risk factors) are stronger predictors of disability at 1 year than the severity of the initial pain. Identifying them early reduces long-term sickness absence by up to 40% (BMJ 2011 RCT).

Diagnose

Classify the Back Pain — Subtype & Duration

Done

Classify by cause and duration — this drives the entire treatment pathway. Most (90%+) is non-specific mechanical LBP.

Non-specific LBP (mechanical)

No identifiable structural cause. Localised lumbar pain, related to posture/movement. Acute <6 weeks · Subacute 6–12 weeks · Chronic >12 weeks. This is the vast majority of presentations.

Radiculopathy (sciatica)

Nerve root compression — typically L4 (medial calf), L5 (dorsum foot), S1 (lateral foot/heel). Pain radiates below the knee in dermatomal pattern. Positive straight leg raise (<60°) highly suggestive. Sensory, motor, and reflex changes may be present.

Inflammatory (Axial SpA / AS)

Meets ASAS criteria: insidious onset age <45, >3 months duration, morning stiffness >1hr, improves with exercise, buttock pain, wakes from sleep. Request HLA-B27 and MRI sacroiliac joints.

Specific structural cause

Spinal stenosis (bilateral leg claudication, relieved by sitting/leaning forward), osteoporotic fracture, discitis. Requires imaging to confirm.

Referred pain

Renal colic, AAA, pancreatitis, pelvic pathology. No spinal tenderness. Pain not altered by spinal movement. Investigate accordingly.

STarT Back Risk

Low risk (score 0–3): simple advice + analgesia. Medium risk (score 4+ but psychosocial <4): physiotherapy. High risk (psychosocial subscale ≥4): combined physiotherapy + psychological support.

Accurate classification prevents over-investigation and under-treatment. Radiculopathy with motor deficit needs urgent MRI as surgical decompression within 6–12 weeks improves outcomes. Axial SpA is frequently diagnosed 8–10 years late, causing significant morbidity — early rheumatology referral changes disease trajectory. Non-specific LBP in low-risk patients does NOT benefit from early imaging — X-ray/CT adds no diagnostic value, increases radiation exposure, and paradoxically increases disability by medicalising a self-limiting condition (NICE NG59, Lancet 2018).

Diagnose

Targeted Examination — Spine, Neurology, Abdomen

Done

Systematic examination takes <4 minutes. Focus on neurological examination — findings change urgency and management plan.

Gait & Posture

Antalgic gait, inability to weight-bear → significant pathology. Observe lumbar lordosis, scoliosis, spasm.

Range of Motion

Flexion (finger-to-floor distance), extension, lateral flexion. Global restriction → degenerative. Asymmetric pain on extension → facet joint. Schober's test <5cm expansion → inflammatory disease.

Palpation

Midline spinous process tenderness → vertebral fracture/infection (significant finding). Paraspinal muscle spasm → mechanical. Sacroiliac joint tenderness → axial SpA.

Straight Leg Raise (SLR)

Positive <60° with reproduction of radiating leg pain → L4/5/S1 radiculopathy (sensitivity 80%, specificity 40%). Cross-SLR positive → large central disc prolapse.

Neurological Lower Limbs

L4: knee extension, knee reflex, medial calf sensation. L5: big toe extension (EHL), dorsum foot sensation. S1: ankle plantar flexion, ankle reflex, lateral foot sensation. Document any deficit formally.

Perianal Sensation

If any bladder/bowel symptoms → test saddle sensation IMMEDIATELY. Loss = cauda equina until proven otherwise → same-day MRI.

Abdominal Examination

Pulsatile epigastric mass → AAA → do not delay, call 999. Renal angle tenderness → pyelonephritis / ureteric colic. Absent bowel sounds + peritonism → emergency.

Vital Signs

Fever >38°C + back pain → spinal infection or pyelonephritis until proven otherwise. HR/BP if haemodynamic compromise suspected.

Neurological examination determines urgency: motor weakness in the lower limbs indicates significant nerve root compression requiring MRI within 24–48 hours and possible surgical referral. Absent ankle reflexes plus sensory loss in a dermatomal pattern confirms radiculopathy and guides analgesic choice (neuropathic agents). Saddle anaesthesia is an absolute indication for same-day emergency MRI — this is the single most time-critical physical finding in back pain. Documenting findings formally protects both patient and clinician.

Diagnose

Investigations — Order Only What Changes Management

Done

Do NOT routinely X-ray non-specific LBP. Investigate only where clinical findings or risk factors indicate sinister cause or guide specialist referral.

Do NOT routinely request

⚠ Avoid Plain X-ray (low-sensitivity for disc/nerve pathology, radiation, increases medicalisation). MRI in first 6 weeks of uncomplicated mechanical LBP — does not improve outcomes (NICE NG59).

Bloods — if red flag suspected

FBC ESR / CRP LFTs / Ca²⁺ / ALP PSA if male + cancer risk Protein electrophoresis (myeloma). Elevated ESR/CRP with night pain → infection or malignancy until proven otherwise.

HLA-B27 + inflammatory markers

If axial SpA suspected (age <45, morning stiffness >1hr, improves with exercise). HLA-B27 positive in ~90% of AS. Also CRP, ESR. Refer to rheumatology with results.

MSU (urine dipstick / MC&S)

If renal angle pain, fever, dysuria → exclude pyelonephritis and renal calculi. Dipstick positive for blood → urine M,C&S and consider ultrasound / urology referral.

MRI lumbar spine

Indicated: radiculopathy not resolving at 4–6 weeks + considering surgical referral. Any neurology. Cauda equina (same-day emergency). Suspected spinal infection or malignancy. GP can request via agreed local pathway — check your CCB/ICB guidance.

X-ray lumbar spine

Only if suspected vertebral fracture (trauma, osteoporosis, steroid use). Not useful for disc disease. CT preferred if fracture likely and MRI not available.

Bone profile / PSA / SPEP

Age >50 + back pain + weight loss + night pain: Ca²⁺ ALP SPEP PSA to screen for myeloma, bone metastases, primary malignancy.

Routine imaging in non-specific LBP does not reduce pain or disability and is associated with increased healthcare utilisation and paradoxically worse outcomes (Foster et al., Lancet 2018). Incidental findings (disc bulges, Modic changes) are present in 30–40% of asymptomatic individuals and lead to unnecessary anxiety and further investigations. ESR >25mm/hr combined with age >50 and back pain has a likelihood ratio of ~7 for malignancy — order when the clinical picture warrants. Reserve MRI for cases where the result will change management, not as reassurance.

Refer

Referral Criteria — Who, When, and How Urgently

Done

Most back pain is managed in primary care. Refer when neurological findings, red flags, or failure to respond to treatment indicate specialist input.

999 Emergency

Cauda equina syndrome (saddle anaesthesia, bilateral leg weakness, new urinary retention/incontinence). Suspected AAA rupture. Suspected spinal cord compression with rapid deterioration.

Same-day Urgent

New significant motor deficit (foot drop, quadriceps weakness). Fever + severe back pain (spinal infection). Acute vertebral fracture with cord compression risk.

2WW Suspected Cancer

Unexplained back pain + weight loss + age >60 (NICE NG12 — suspected cancer pathway). Thoracic spine pain + known primary cancer. Persistent thoracic pain without mechanical cause.

Urgent (within 2 weeks)

Progressive neurological deficit (worsening foot drop, increasing sensory loss). Radiculopathy with severe motor weakness not improving at 6 weeks. Suspected spinal metastases.

Routine Neurosurgery / Ortho

Radiculopathy not responding to 6–12 weeks of conservative management. MRI-confirmed significant disc prolapse + persistent disability. Spinal stenosis with claudication limiting quality of life.

Routine Rheumatology

Suspected axial SpA (inflammatory features, HLA-B27 positive). Early-onset (<45 years) back pain unresponsive to simple analgesia with inflammatory features.

MSK / Physiotherapy

Medium/high STarT Back score — refer to musculoskeletal physiotherapy service directly. High psychosocial risk — refer to combined physical and psychological pain programme (CBT-based).

Pain Management

Chronic back pain (>3 months) not responding to first-line management. Consider multidisciplinary pain clinic. Avoid escalating opioids without specialist input.

Cauda equina requires decompression within 24–48 hours to prevent permanent bladder/bowel dysfunction — delay is the main driver of litigation in spinal pathology. Foot drop from disc prolapse recovers significantly better if operated within 6 weeks. Delayed referral for axial SpA remains a known quality-of-care failure in UK primary care — NICE guidance supports direct rheumatology referral when inflammatory features are present. Multidisciplinary pain programmes are more effective than surgery or opioids for chronic non-specific LBP (NICE NG59, Cochrane evidence).

Treat

Analgesic Ladder & Pharmacological Treatment

Done

Tailor analgesia to pain type (nociceptive vs neuropathic), severity, and comorbidities. Always combine with active physiotherapy — drugs alone are insufficient.

Mechanical / Nociceptive

Paracetamol ± NSAID 1st line

Paracetamol 1g QDS (regular, not PRN). Add topical NSAID first (diclofenac gel 1% TDS) — fewer GI side effects. Oral NSAID if inadequate: ibuprofen 400mg TDS with food or naproxen 500mg BD with PPI if GI risk.

Radiculopathy / Neuropathic

Neuropathic agent Add-on

Amitriptyline 10mg nocte (titrate to 25–75mg). Or gabapentin 300mg nocte (titrate to 300mg TDS). Warn: sedation, driving, alcohol interaction. Avoid in elderly without specialist advice.

Acute severe spasm

Short-term muscle relaxant Caution

Diazepam 2mg TDS for max 5–7 days only. Warn about addiction potential, driving. Avoid in substance misuse history. NOT for chronic use.

Step 1Paracetamol 1g QDS regular + topical diclofenac 1% gel TDS to affected area. Reassess 1–2 weeks.

Step 2Add oral NSAID — ibuprofen 400mg TDS with food, or naproxen 500mg BD. Add PPI (omeprazole 20mg OD) if >45 years, GI risk, or concurrent steroid. Review renal function. Short course: 2–4 weeks max.

Step 3 (neuropathic)Amitriptyline 10mg nocte — titrate by 10mg every 2 weeks to 25–75mg. Alternatives: duloxetine 30mg OD (titrate to 60mg) — especially if co-morbid depression. Review at 4 weeks.

Step 4Weak opioid — codeine phosphate 30–60mg QDS (short-term, <4 weeks only) — always with regular laxative (macrogol). Constipation warning. Do NOT combine with tramadol.

Step 5 (specialist)Do NOT escalate to strong opioids without pain specialist input. If considering: refer to chronic pain service. Avoid in non-specific chronic LBP — evidence does not support long-term opioids. No benefit vs harm in chronic LBP (Cochrane 2023).

Oral Corticosteroids

Not routinely recommended for mechanical LBP. May consider short course (prednisolone 40mg OD for 5 days) for severe acute radiculopathy — discuss with senior / specialist. Limited evidence; significant side effects.

Topical Capsaicin

Capsaicin 0.075% cream TDS-QDS — useful adjunct for localised chronic pain. Warn: burning sensation on application, takes 4–6 weeks for effect.

NSAIDs — Contraindications

Avoid NSAIDs in: eGFR <30, heart failure, uncontrolled hypertension, active peptic ulcer, pregnancy. Check medication list for anticoagulants (bleeding risk).

Paracetamol alone has low evidence for LBP (NNT ~15) but is safe and appropriate as baseline. NSAIDs have the strongest evidence for short-term pain relief in LBP (NNT ~6, Cochrane 2017) but carry GI, CV, and renal risks — limit to 2–4 weeks. Opioids: systematic reviews show no meaningful benefit over placebo for chronic non-specific LBP, with significant harms (addiction, constipation, falls in elderly, hyperalgesia). NICE NG59 explicitly states do NOT offer opioids for chronic primary pain. Amitriptyline and duloxetine are NICE-recommended for neuropathic pain; duloxetine has the additional advantage of treating co-morbid depression/anxiety, which frequently accompanies chronic back pain.

Lifestyle

Non-Pharmacological Treatment — The Most Important Step

Done

NICE NG59 is explicit: exercise and self-management are the primary treatment for back pain. Drugs without these are insufficient. Prescribe activity as medicine.

Stay Active — No Bed Rest Strongly advise to continue normal activity as much as pain allows. Bed rest worsens outcomes and promotes chronicity. "Keep moving" is the single most important message.

Structured Exercise Programme Refer to physiotherapy (NHS or self-refer). Core stabilisation, McKenzie exercises, aerobic exercise all have evidence. Goal: 150 minutes moderate-intensity activity/week. Reduces recurrence by ~30%.

Manual Therapy / Manipulation NICE-recommended as part of a treatment package. Spinal manipulation (physiotherapist or osteopath), mobilisation, or massage — offer as adjunct to exercise, not standalone. 6–12 sessions over 8–12 weeks.

Heat Application Topical heat (wheat bag, hot water bottle) — good evidence for short-term relief in acute mechanical LBP. Advise 15–20 minutes TDS. Reduces muscle spasm and improves mobility. Simple, cheap, effective.

Weight Management BMI >30 significantly increases LBP burden. Refer to NHS weight management programme. Achieving healthy BMI reduces chronic back pain prevalence by ~20%. Brief intervention and referral in consultation.

Psychological Support (CBT) For medium/high STarT Back scores — refer to pain-focussed CBT, ACT (Acceptance & Commitment Therapy), or mindfulness-based stress reduction. Reduces catastrophising, improves function. As effective as surgery in chronic non-specific LBP.

Smoking Cessation Smoking impairs disc nutrition and is an independent risk factor for back pain and poor recovery. Refer to NHS Stop Smoking Service or prescribe NRT. Cessation improves both pain and surgical outcomes.

Sleep Hygiene & Ergonomics Poor sleep amplifies pain perception. Advise: firm mattress (medium-firm evidence-based), sleep position guidance (pillow between knees if side-lying). Workplace ergonomics assessment if sedentary/manual work — via occupational health or self-referral.

Return to Work Early return (within 2–4 weeks) significantly reduces risk of chronic disability. Use fit note thoughtfully — "may be fit for work with adjustments" is often more appropriate than full incapacity. Discuss with employer-adjusted duties.

Acupuncture NICE removed strong recommendation but acknowledges patient benefit. Some CCGs/ICBs commission it. Discuss as option if patient requests — 10 sessions. Not routinely commissioned nationally.

Exercise therapy has NNT ~5 for clinically meaningful improvement in chronic LBP — better than any single drug class. Cognitive Behavioural Therapy combined with physiotherapy reduces long-term disability by 35–50% (BEAM trial, BMJ 2004). Return to work: being off work >6 months confers a 50% likelihood of still being off work at 1 year — early intervention is critical. Bed rest is actively harmful: the Cochrane review (2010) shows it worsens pain and disability versus staying active. The message to patients: "Your back is not fragile. Movement heals it."

Safety

Follow-Up, Monitoring & Safety-Netting

Done

Provide clear safety-net instructions at every consultation. Document that you have given them. Follow-up intervals depend on risk stratification and treatment.

1–2 weeks

Review if: high STarT Back score, started neuropathic analgesia, acute severe episode, or any uncertainty. Assess: pain score, function, medication tolerance, ability to work.

4–6 weeks

Routine review for subacute or persistent LBP. Assess: response to treatment, physiotherapy attendance, psychosocial factors. Consider MRI if radiculopathy not improving. Reassess STarT Back score.

3 months

Chronic LBP review. Assess: analgesic appropriateness (are opioids still being taken?), functional improvement, occupational impact, pain management programme referral. Consider medication rationalisation.

Ongoing

Annual review for chronic LBP patients. Review: all long-term medications (amitriptyline, gabapentin — renal monitoring for gabapentin annually). Assess for depression (PHQ-9) and anxiety (GAD-7) — comorbid in >30% of chronic pain patients.

999 if

New saddle anaesthesia or perineal numbness. New bilateral leg weakness. New urinary retention or incontinence. Sudden severe onset "worst ever" back pain (AAA / aortic dissection). Leg paralysis.

Same-day GP if

Fever >38°C with back pain. New foot drop or rapidly progressive neurological deficit. Severe pain unresponsive to analgesia. Suspicion of vertebral fracture after fall. Unexplained weight loss noted.

Fit Note Guidance

Acute LBP: 1–2 weeks "may be fit for work with adjustments" preferred over full incapacity. Subacute: consider phased return, altered duties. Avoid >6-week sick notes without review — increases chronicity risk.

Medication Review

NSAIDs: maximum 4–6 weeks then stop or reassess. Opioids: review at each appointment — taper if >4 weeks. Gabapentinoids: Schedule 3 CD (controlled drug) — monitor for misuse. Document review in notes.

Safety-netting for cauda equina must be explicit and documented — courts have found GPs negligent for failure to document this warning. The 10-minute consultation is high-risk: 80% of missed cauda equina diagnoses had a previous GP contact where red flags were present but not acted upon (Hoeritzauer et al., 2020). Long-term opioid review: ~30% of patients prescribed opioids for LBP in UK primary care are still on them at 5 years, despite no evidence of benefit — active deprescribing reduces harm. Gabapentinoids became Schedule 3 Controlled Drugs in 2019 due to misuse potential — require monitoring and cannot be issued by repeat prescription without review.