Sciatica
Symptoms, Causes & Treatment
Understanding sciatica: what causes nerve root pain, how it is distinguished from other back and leg pain, and the most effective treatments including physiotherapy and surgery.
What Is Sciatica?
Sciatica is pain that radiates along the course of the sciatic nerve, from the lower back through the buttock and down the leg, typically to the foot. It is caused by compression or irritation of the sciatic nerve roots (L4, L5, S1) or the sciatic nerve itself.
The most common cause is a herniated intervertebral disc pressing on the nerve root. Sciatica affects up to 40% of people at some point. The good news: 80–90% of sciatica resolves within 6–12 weeks with conservative management.
Sciatica with bladder or bowel dysfunction is cauda equina syndrome — a medical emergency. Do not wait for a GP appointment.
What Are the Symptoms of Sciatica?
Sciatica has characteristic symptoms that distinguish it from other causes of leg pain. The distribution of symptoms reflects which nerve root is compressed.
Radiating pain from lower back through buttock and down the leg · Tingling or numbness in leg or foot · Weakness in leg muscles · Pain worse with sitting · Sharp, shooting, or burning character · Usually one-sided
Cauda equina syndrome: bilateral leg weakness, saddle anaesthesia, bladder/bowel dysfunction — 999 emergency · Progressive motor weakness despite treatment · Sciatica with fever and back pain (possible discitis or epidural abscess)
Any change in bladder or bowel function alongside back or leg pain is a red flag for cauda equina syndrome. Call 999 or attend A&E immediately. This is a time-critical surgical emergency where delay causes permanent paralysis.
What Causes Sciatica?
Sciatica is caused by compression or irritation of the sciatic nerve, most commonly from a lumbar disc herniation. The level of compression determines which nerve root is affected and what symptoms are produced.
Disc herniation (prolapsed intervertebral disc) causes sciatica by compressing the exiting nerve root. L4/L5 herniation affects the L5 nerve root (foot drop risk); L5/S1 herniation affects S1 (absent ankle reflex, plantarflexion weakness).
Non-specific low back pain (no identifiable cause) accounts for 85% of presentations. Disc herniation, facet joint degeneration, and muscle/ligament strain are the most common structural causes. Poor posture and sedentary lifestyle are key contributors.
Osteoarthritis of the lumbar spine causes facet joint degeneration and osteophyte formation, narrowing the spinal canal (spinal stenosis). This causes neurogenic claudication — pain in both legs on walking that improves with bending forward.
Osteoarthritis (OA) causes progressive loss of articular cartilage, subchondral bone remodelling, and osteophyte formation. It is the most common cause of chronic joint pain in adults over 50, affecting knees, hips, hands, and spine.
Muscle strains occur when muscle fibres are overstretched or torn. Grade 1 = mild stretch; Grade 2 = partial tear; Grade 3 = complete rupture. Eccentric muscle loading during sprinting, jumping, or lifting is the most common mechanism.
RICE (Rest, Ice, Compression, Elevation) is the first-line management for acute muscle strain in the first 48–72 hours. Aim to return to gentle movement within 2–3 days to prevent muscle atrophy and stiffness.
Key Risk Factors
How Is Sciatica Diagnosed?
Sciatica is diagnosed clinically in most cases. The SLR test reproduces sciatic pain when positive. MRI is indicated for persistent symptoms beyond 6 weeks, red flags, or when surgery is being considered.
How Is Sciatica Treated?
Most sciatica is managed conservatively. Surgery is effective when conservative management fails after 6–8 weeks or when there is progressive neurological deficit.
Supportive Measures
Staying active (walking, swimming) is more effective than bed rest. Regular analgesia (paracetamol + NSAIDs) relieves pain. Applying heat to the lower back relaxes muscle spasm. Sleep on a firm mattress with a pillow between the knees. Avoid prolonged sitting — set a timer to stand every 30 minutes.
Persistent Sciatica & Surgical Options
Sciatica not resolving after 6–8 weeks of conservative treatment warrants MRI and orthopaedic/neurosurgical assessment. Microdiscectomy is highly effective for disc-related sciatica with persistent symptoms. Following surgery, physiotherapy prevents recurrence. Long-term core strengthening is the most effective recurrence prevention strategy.
When Should You Seek Medical Advice for Sciatica?
Cauda equina syndrome: bilateral leg weakness, bladder/bowel dysfunction, saddle numbness — call 999. This requires emergency MRI and spinal decompression surgery. Every hour of delay risks permanent paralysis.
Any bladder or bowel change with back pain · Progressive leg weakness · Sciatica not improving after 6 weeks of conservative management · Severe, incapacitating pain not controlled with oral analgesia.
How to Prevent Sciatica
Most sciatica arises from disc disease that develops over years. These measures reduce the risk of disc herniation and nerve compression.
Cauda equina syndrome is a surgical emergency. If you develop back pain with any change in bladder or bowel function, numbness in the saddle area, or bilateral leg weakness — call 999 or attend A&E immediately. Do not wait for a GP appointment.
Maintain strong, flexible muscles around the spine and joints. Core strengthening (Pilates, swimming), hip strengthening (glute exercises), and hamstring stretching are the most evidence-based approaches for back pain and sciatica prevention.
Staying active is the single most important thing you can do for back pain. Bed rest delays recovery. Walking, swimming, and gentle stretching keep muscles from weakening. Aim to return to normal activities as soon as pain allows.
Set up your workstation correctly: screen at eye level, feet flat on the floor, chair supporting the lumbar curve, monitor arm's length away. Take micro-breaks every 30 minutes to stand and stretch.
Warm up adequately before exercise and cool down after. Increase training load gradually (the 10% rule). Strengthen muscles around vulnerable joints (glutes for knee, rotator cuff for shoulder, core for back) to reduce injury risk.
Know back pain red flags: bladder or bowel changes, saddle numbness, leg weakness, fever, unexplained weight loss, history of cancer. Any of these require same-day emergency assessment, not a routine appointment.
Speak to a Clinician About Sciatica
Through The GP Service, a licensed clinician can assess sciatica, prescribe appropriate analgesia and neuropathic pain medication, arrange imaging referrals, and refer for physiotherapy or surgical assessment.



Expert clinical advice, when you need it.
Sciatica FAQs
Sciatica is caused by compression of the sciatic nerve or its nerve roots — most commonly from a disc herniation at L4/5 or L5/S1. Around 80–90% of sciatica resolves within 6–12 weeks with conservative management: staying active, NSAIDs, physiotherapy, and nerve pain medication if needed. Red flags requiring emergency assessment: loss of bladder or bowel control, saddle numbness, or rapidly progressive leg weakness. These could indicate cauda equina syndrome, which is a surgical emergency.
Allopurinol should never be started during an acute gout attack as this can prolong or worsen the flare. It should be started 2–4 weeks after the acute attack has settled, ideally while continuing prophylactic colchicine or NSAID cover for the first 3–6 months. Start at 100mg daily and increase every 4 weeks to achieve a target serum urate below 360 μmol/L. Once on a stable dose, allopurinol is continued indefinitely. Stopping and restarting is a common cause of recurrent attacks.
Most back pain is non-specific — caused by muscle, ligament, or disc strain without any serious underlying cause. The vast majority resolves within 4–6 weeks. Key red flags to watch for: bladder or bowel changes (possible cauda equina syndrome — call 999), fever, unexplained weight loss, or pain that is unrelenting at night regardless of position. If none of these are present, staying active, taking regular analgesia, and seeing a physiotherapist is the most effective approach.
Bed rest is not recommended and actually slows recovery. Staying as active as pain allows — walking, gentle stretching, swimming — helps the back heal faster. Most non-specific back pain improves within 4–6 weeks with movement, NSAIDs, and physiotherapy. Seeing a physiotherapist early produces better outcomes than waiting. If back pain has not improved after 6 weeks, or is worsening, a GP review is warranted to consider imaging and further management.
Joint pain with a hot, red, severely swollen joint and fever is a red flag for septic arthritis — a surgical emergency. This requires same-day joint aspiration and IV antibiotics. Joint pain without these features requires investigation to determine the cause: OA, RA, gout, or reactive arthritis. Getting the right diagnosis quickly matters because RA causes joint erosion within weeks to months of onset, and early DMARD treatment dramatically reduces long-term disability.
OA affects cartilage and causes pain that worsens with use and eases with rest. RA is an autoimmune disease causing symmetrical synovial inflammation, morning stiffness >1 hour, systemic symptoms, and elevated inflammatory markers. RA gets worse without treatment and causes irreversible joint destruction; OA does not have systemic consequences. Getting the right diagnosis early is important because the treatments are completely different. If you have morning stiffness lasting over an hour and symmetrical joint swelling, see a clinician urgently for RA screening.
Gout attacks are caused by a sudden deposition of uric acid crystals in the joint. They are excruciatingly painful, typically beginning at night, affecting the big toe, ankle, or knee. Most attacks settle within 7–14 days. Short-term treatment with NSAIDs, colchicine, or prednisolone brings rapid relief. Urate-lowering therapy with allopurinol prevents recurrent attacks and is very effective. Gout is entirely manageable — it is not something that has to be simply endured.
Most rotator cuff problems — tendinopathy, partial tears, and impingement — respond well to physiotherapy. A targeted physiotherapy programme addressing rotator cuff strength and scapular control resolves 70–80% of cases within 3–6 months. Steroid injection provides short-term relief but does not improve long-term outcomes. Full-thickness rotator cuff tears with significant weakness warrant MRI assessment and possible surgical repair, especially in younger or active patients. Frozen shoulder runs a natural history of 1–3 years and usually resolves fully without surgery.
