Sciatica
Radiating pain along the sciatic nerve — from your lower back to your foot
ICD-10: M54.3 · lumbar condition
Sciatica is a symptom rather than a diagnosis — it refers to pain that radiates along the path of the sciatic nerve, from the lower back through the hip and down one leg. It most often occurs when the sciatic nerve is compressed by a herniated disc, bone spur, or spinal stenosis. Most cases improve with conservative care within 4–12 weeks, though severe or persistent cases may need intervention.
10–40%
Sciatica affects an estimated 10–40% of people at some point in their lives, with a peak incidence between ages 40–50.
Konstantinou K et al., Spine Journal (2008)80–90%
Approximately 80–90% of sciatica cases resolve without surgery within 4–6 weeks of conservative management.
American Academy of Orthopaedic Surgeons85–90%
Microdiscectomy relieves leg pain in approximately 85–90% of appropriately selected sciatica patients.
North American Spine SocietyClassification
Disc Herniation–Related (Compressive Sciatica)
~90% of sciatica casesThe most common subtype; herniated nucleus pulposus at L4-L5 or L5-S1 directly compresses the L5 or S1 nerve root, producing radicular pain along its dermatomal distribution
Stenosis-Related Sciatica
Common in adults over 55Lateral recess or foraminal stenosis compresses the nerve root within a bony channel; more common in adults over 55; often bilateral and associated with neurogenic claudication
Piriformis Syndrome (Extra-Spinal)
Less common; often a diagnosis of exclusionSciatic nerve irritation or compression at the level of the piriformis muscle in the buttock rather than within the spinal canal; absence of disc-nerve correlation on MRI helps distinguish this subtype
Non-Compressive (Inflammatory) Sciatica
Subset of disc herniation casesNerve root inflammation driven by inflammatory cytokines released from the nucleus pulposus in the absence of significant mechanical compression; may partially explain why pain severity does not always correlate with imaging findings
Symptoms
- Sharp, shooting, or burning pain from the lower back down through the buttock and leg
- Pain that worsens with sitting, prolonged standing, or coughing
- Numbness, tingling, or pins-and-needles in the leg or foot
- Muscle weakness in the affected leg — difficulty moving the foot or calf
- Pain typically affecting only one side of the body
- Difficulty standing up straight or walking long distances
Causes & Risk Factors
- Lumbar disc herniation pressing on the sciatic nerve root (most common)
- Lumbar spinal stenosis compressing nerve roots in the canal
- Degenerative disc disease causing foraminal narrowing
- Spondylolisthesis (vertebral slippage) impinging on nerve roots
- Piriformis syndrome — sciatic nerve irritation by the piriformis muscle
- Pregnancy-related pelvic changes compressing the sciatic nerve
- Less commonly: tumors, blood clots, or infection near the nerve
Imaging Findings
Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.
MRI
- Herniated nucleus pulposus at L4-L5 or L5-S1 compressing the L5 or S1 nerve root — the most common imaging finding in disc-related sciatica
- T2 hyperintensity of the compressed nerve root may indicate root edema and correlates with pain severity
- Disc extrusion or sequestration in severe cases where nuclear material has completely migrated beyond the disc space
- Importantly, imaging abnormalities are common in pain-free individuals — MRI findings must be interpreted with symptoms, not in isolation
CT Scan
- CT myelogram demonstrates nerve root sheath compression and displacement when MRI is contraindicated
- Better characterizes bony foraminal stenosis contributing to nerve root compression in older patients with spondylosis
- Standard CT without myelogram has limited soft-tissue sensitivity for disc material and nerve root compression
X-Ray
- Usually normal in disc herniation-related sciatica; may show disc height loss or degenerative changes as background findings
- Useful to screen for alternative diagnoses including spondylolisthesis, fracture, or tumor when trauma or red flags are present
- Not indicated as a primary diagnostic tool for suspected disc herniation
Who Is Commonly Affected
The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.
Peak Age Range
40–59 years; heavy manual labor, prolonged sitting, obesity, and smoking are the strongest modifiable risk factors
Gender Distribution
Men affected more commonly, approximately 60–70%; likely related to higher rates of heavy occupational physical loading
Estimated Prevalence
Lifetime prevalence 10–40% in adults; annual incidence 1–5% in working-age population; approximately 90% of cases caused by a herniated lumbar disc
Treatment Options
Conservative
- Physical therapy with targeted stretches and core strengthening
- Anti-inflammatory medications (NSAIDs) and muscle relaxants
- Epidural steroid injections for significant nerve inflammation
- Hot/cold therapy during flare-ups
- Keeping active (walking, swimming) rather than prolonged bed rest
- Activity modification and ergonomic adjustments
Surgical
- Microdiscectomy — removes the herniated disc fragment pressing on the nerve
- Laminectomy — decompresses nerve roots in stenosis-related sciatica
- Spinal fusion for cases with significant instability
Treatment Pathway
Conservative Care (0–6 weeks)
Activity modification, anti-inflammatory medication, and structured physical therapy with nerve root mobilization techniques. Most acute disc herniation–related sciatica resolves with conservative management.
- NSAIDs or short-course oral steroids for severe acute flares
- Nerve flossing and McKenzie directional exercises
- Activity modification — avoid sustained lumbar flexion
Epidural Steroid Injection (6–12 weeks if needed)
Transforaminal epidural steroid injection at the affected nerve root level reduces radicular inflammation and may restore function sufficiently to allow rehabilitation.
- Transforaminal ESI at L4-L5 or L5-S1
- Reassessment for progressive neurological deficit
Surgical Evaluation (>12 weeks or progressive deficit)
Microdiscectomy is considered for persistent sciatica failing conservative care. Urgent surgery is indicated for progressive foot drop or bowel/bladder dysfunction.
- Microdiscectomy or endoscopic discectomy
- Urgent decompression for foot drop or cauda equina symptoms
Conservative Care — What to Expect Without Surgery
Most acute sciatica episodes improve significantly with conservative care over 4–12 weeks. The SPORT trial found that a meaningful proportion of patients improve without surgery, though surgical decompression produces faster relief for severe or persistent radicular leg pain.
SPORT Trial — Lumbar Disc Herniation (NEJM 2006)Conservative Treatment Options
Neural mobilization, McKenzie directional preference, and core stabilization. PT addresses the movement patterns that reproduce radicular symptoms.
NSAIDs reduce inflammatory radicular pain. Neuropathic agents (gabapentin, pregabalin) target nerve pain with modest effect sizes.
Most effective for the leg pain component of sciatica. Transforaminal approach is more targeted than interlaminar; effect typically lasts 2–12 weeks.
Maintaining mobility within tolerance. Gradual return to activity is preferable to bed rest.
When Is Surgery Typically Considered?
Surgical decompression (microdiscectomy or laminectomy) is typically considered after 6–12 weeks of conservative care without meaningful improvement, or earlier for progressive motor weakness or severe functional impairment.
Red Flags — Seek Urgent Care
- Progressive leg weakness or foot drop — seek same-day evaluation
- Bilateral leg symptoms with bladder/bowel changes — go to the ER immediately
- Sudden complete numbness in one or both legs — seek urgent evaluation
When to see a spine specialist
See a spine specialist if sciatica does not improve within 4–6 weeks, if you develop leg weakness, or if you experience any changes in bladder or bowel function (seek emergency care immediately).
Specialists Who Treat Sciatica
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Prognosis
The following factors are commonly associated with recovery outcomes for this condition based on published literature. Individual outcomes vary and depend on many clinical factors.
Prognosis Factors
Favorable
- A substantial proportion of acute disc herniation–related sciatica cases resolve within 6–12 weeks with conservative management
- Young age, first episode, and contained disc herniation (higher natural resorption rate)
- Absence of foot drop, bowel/bladder dysfunction, or severe progressive motor deficit
- Good psychosocial coping and absence of fear-avoidance behavior
Unfavorable
- Sequestrated free disc fragment with ongoing nerve root compression and no imaging evidence of resorption
- Symptom duration exceeding 3 months, associated with central sensitization
- Progressive foot drop or bladder/bowel symptoms that may require urgent surgical consideration
- Psychosocial distress and fear-avoidance behavior, which are associated with delayed recovery independent of anatomic severity
Questions to Ask Your Doctor
Bring these questions to your next appointment about sciatica.
- 1
Is my sciatica caused by a disc herniation, spinal stenosis, or another source — and does that distinction change the treatment approach?
- 2
Based on my symptoms and imaging, how long should I realistically expect to follow conservative treatment before we consider escalating?
- 3
Are there specific activities, body positions, or exercises that are likely to help or make my sciatica worse at this stage?
- 4
If I need an epidural steroid injection, how quickly could it work, and how many injections are typically appropriate before reconsidering the plan?
- 5
At what point would surgery be the right option, and what type of procedure would I likely need?
Research Evidence
No studies reviewed yet for this condition. Check back soon — our evidence pipeline runs nightly.
Clinical Evidence
Frequently Asked Questions
How do I know if I have sciatica or just back pain?
The key distinguishing feature of sciatica is that it radiates — the pain travels from the lower back or buttock down through the leg, often below the knee and into the foot. Pure back pain tends to stay in the back. Sciatica may also include numbness, tingling, or weakness in the leg.
What should I avoid doing with sciatica?
Avoid prolonged sitting (especially hunched forward), heavy lifting with poor form, high-impact activities during flare-ups, and positions that make the pain worse (often forward bending or straight-leg raises). Complete bed rest is actually counterproductive — gentle walking and movement help recovery.
How long does sciatica last?
Acute sciatica from a disc herniation often improves within 4–12 weeks as the herniated material is absorbed by the body. Chronic sciatica — lasting more than 3 months — is less likely to resolve on its own and benefits from specialist evaluation. The likelihood of needing surgery is roughly 10% overall.