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Orthopaedics • Lumbar Spine & Nerve Roots

Sciatica

Medical terms: Lumbar Radicular Pain • Lumbosacral Radiculopathy • Nerve-Root Pain

Sciatica describes pain and sometimes tingling, numbness or weakness caused by irritation of a nerve root in the lower spine. Symptoms commonly travel from the buttock into one leg and may reach the calf, foot or toes. Back pain may be present, but the leg symptoms are often more prominent.

A lumbar disc herniation is a common cause, but narrowing around a nerve, spinal stenosis and other conditions can produce a similar pattern. Most uncomplicated cases improve without surgery. New bladder or bowel difficulty, saddle numbness, rapidly worsening weakness or severe symptoms in both legs requires emergency assessment for cauda equina syndrome.

Book an Orthopaedic Review Check warning signs ↓

Some sciatica symptoms need emergency or urgent assessment

Seek Urgent Medical Help for These Warning Signs

  • New inability or increasing difficulty starting urination, loss of sensation while passing urine, inability to feel whether the bladder is full or empty, or new loss of bladder control.
  • New loss of bowel control, inability to feel a bowel movement, or an unexpected change in sexual sensation or function together with back or leg symptoms.
  • New numbness or altered feeling between the inner thighs, around the genitals, buttocks or anus, including altered sensation when wiping after using the toilet.
  • Severe or rapidly worsening weakness in one or both legs, a new foot drop, inability to walk safely, or sciatica that has suddenly become bilateral.
  • Severe back and leg symptoms after major trauma, or after minor trauma in someone with osteoporosis, long-term steroid use or another major fracture risk.
  • Sciatica with fever, chills, confusion or feeling seriously unwell—especially with diabetes, immune suppression, recent infection, spinal procedure, tuberculosis risk or intravenous drug use.
  • New persistent symptoms with unexplained weight loss, a history of cancer, progressively worsening night pain or another concern for tumour.
  • A cold, pale or blue foot, absent pulse, or sudden severe leg pain; or a newly swollen, warm leg with breathlessness or chest pain. These suggest a circulation or clotting emergency rather than ordinary sciatica.

Cauda equina syndrome is rare, and many bladder or bowel symptoms have unrelated causes. The important issue is a new change occurring with back or leg symptoms. Do not self-diagnose or delay because a symptom feels embarrassing—seek emergency assessment so the neurological examination and urgent MRI decision can be made promptly.

What Does “Sciatica” Actually Mean?

Radicular pain Pain arising from an irritated spinal nerve root, often sharp, burning, electric or shooting.
Radiculopathy Objective nerve dysfunction such as weakness, altered sensation or a changed reflex.
Referred pain Back, hip or surrounding tissues can send pain into the buttock or thigh without nerve-root dysfunction.
Sciatic nerve A large nerve formed from several lower-spinal roots; symptoms usually begin before these roots join.
Disc herniation Disc material extends focally and may inflame or compress a nearby nerve root.
Stenosis Narrowing of the spinal canal, lateral recess or nerve-exit opening may crowd one or more nerves.

“Sciatica” is useful shorthand, but it does not identify the exact level, cause or severity. A patient may have radicular pain without measurable weakness, or radiculopathy with surprisingly little pain. The examination clarifies the pattern.

How Can Sciatica Feel?

Pain Burning, electric, stabbing or shooting pain may travel from the buttock down the thigh into the calf, foot or toes. It may be continuous or provoked by sitting, bending, coughing, sneezing, standing or walking.
Tingling or numbness Pins and needles or reduced sensation may affect part of the leg or foot. The distribution offers clues but overlaps between people and cannot identify one nerve level with certainty.
Weakness Difficulty straightening the knee, lifting the foot or big toe, standing on tiptoe, climbing stairs or controlling the ankle can reflect nerve dysfunction. New or progressive weakness deserves prompt assessment.
Symptoms worse sitting or bending Some disc-related patterns are aggravated by prolonged sitting, flexion, coughing or sneezing, though this is not a diagnostic rule and many positions can irritate a sensitive nerve temporarily.
Symptoms worse standing or walking Spinal stenosis may produce leg heaviness, pain or numbness during standing and walking, relieved by sitting or leaning forward. Reduced circulation can look similar and must be considered.
Leg pain without much back pain Sciatica can be leg-dominant. The absence of severe back pain does not exclude a lumbar nerve-root problem, and severe back pain without a leg pattern is not automatically sciatica.

Nerve-Root Patterns: Useful Clues, Not a Home Diagnosis

L4 pattern Pain or altered feeling may involve the front of the thigh and inner shin, with possible knee-extension weakness or a changed knee reflex. Hip and femoral-nerve conditions can overlap.
L5 pattern Symptoms may travel along the outer leg toward the top of the foot or great toe, with possible weakness lifting the foot or big toe. Peroneal-nerve problems can produce a similar foot drop.
S1 pattern Pain or numbness may affect the back of the calf and outer or sole of the foot, with possible difficulty pushing down through the foot, standing on tiptoe or a changed ankle reflex.
Why patterns overlap Individual anatomy varies; inflammation may spread; and pain, sensation, strength and reflex findings do not always follow identical maps. MRI should be matched to the examined side and function.

Pain Intensity and Nerve Damage Are Not the Same Measurement

An inflamed nerve can produce severe pain without progressive weakness, while meaningful motor loss can occasionally occur with less pain. Monitoring strength, sensation, walking and bladder or bowel function is therefore more useful than judging urgency from the pain score alone.

Common Causes and Conditions That Can Mimic Sciatica

Lumbar disc herniation A protrusion or extrusion can inflame and compress a nerve root. Many disc-related episodes improve as inflammation settles and the body adapts or reduces the herniated material over time.
Foraminal or lateral-recess stenosis Disc-height loss, facet change or bone spurs may narrow the route of a nerve, sometimes producing activity- or position-dependent symptoms.
Central lumbar spinal stenosis Crowding of several nerve roots can cause symptoms in one or both legs during standing or walking. This differs from sudden cauda equina syndrome, though neurological change still requires assessment.
Spondylolisthesis or instability One vertebra lies forward or backward relative to another and may contribute to foraminal or canal narrowing. The slip grade alone does not determine treatment.
Hip or deep-gluteal pain Hip arthritis, gluteal tendinopathy and deep-gluteal conditions may refer pain into the thigh. “Piriformis syndrome” should not be assumed without excluding lumbar, hip and other causes.
Peripheral-nerve condition Peroneal, femoral or other nerve problems can cause numbness or weakness below the spinal nerve root. Diabetes and polyneuropathy often produce a different, more symmetrical pattern.
Circulation or clotting problem Arterial disease may cause exertional leg pain with a cold foot or weak pulses. Deep-vein thrombosis more often causes swelling, warmth and tenderness than an electric nerve pattern. Both require separate assessment.
Less common serious causes Fracture, infection, tumour and inflammatory disease can involve a nerve root. Warning features, medical history and examination determine when these must be investigated urgently.

What Happens During an Orthopaedic Assessment?

  • History: exact route of pain, onset, back symptoms, provoking positions, numbness, weakness, walking tolerance and effect on sleep or work.
  • Cauda equina screening: direct, sensitive questions about new bladder, bowel, saddle-sensation and sexual-function change.
  • Strength: selected hip, knee, ankle, foot and toe movements are compared side to side.
  • Sensation and reflexes: leg and foot sensation, knee reflexes and ankle reflexes help localise possible nerve dysfunction.
  • Walking: ordinary gait, heel walking, toe walking, balance and tolerance may reveal functional weakness.
  • Nerve-tension tests: straight-leg raise or femoral-nerve stretch may reproduce familiar symptoms, but neither test diagnoses a disc level alone.
  • Mimics: hip, knee, peripheral nerves, pulses, leg swelling and abdominal or urinary clues are assessed when relevant.

Tell the clinician about cancer, fever, recent infection, diabetes, immune suppression, osteoporosis, steroid use, anticoagulants, trauma and previous spine procedures. These details may change the urgency and type of imaging.

Which Tests or Scans Might Be Needed?

No immediate imaging Often appropriate for new typical sciatica without cauda equina symptoms, progressive neurological loss or another serious warning feature. Early imaging commonly shows unrelated age-associated changes.
MRI lumbar spine The main scan for discs, nerve roots, spinal canal and serious soft-tissue causes. It is urgent for suspected cauda equina and selected progressive deficits, and useful when persistent symptoms may lead to an injection or surgical opinion.
X-ray Shows bones, alignment and selected fractures but not the lumbar nerve roots or discs directly. It is not a test that confirms ordinary sciatica.
CT or CT myelography CT provides detailed bone imaging. CT myelography is a specialist alternative when MRI cannot answer the question or is contraindicated; it is invasive and not routine.
Nerve-conduction studies and EMG Sometimes help when the level is unclear, symptoms persist, or a peripheral-nerve condition could explain weakness or numbness. They are not routinely required for a straightforward recent episode.
Ultrasound Ultrasound cannot assess lumbar discs, spinal canal or spinal nerve roots. It may investigate a separate hip, vascular, abdominal, pelvic or urinary question when the clinical pattern suggests a mimic.

The MRI Must Explain the Correct Side, Level and Function

A report may list several disc bulges, yet only one—or none—matches the patient's symptoms. A useful finding should fit the side of leg pain, sensory area, weak movement and reflex pattern. MRI is not interpreted by choosing the largest-sounding word.

What Can I Do Safely at First?

  • Continue ordinary activity within tolerance and avoid prolonged bed rest; use shorter, more frequent periods of movement during an irritable flare.
  • Change sitting, standing and walking positions regularly. A temporarily comfortable position is useful, but no single posture must be maintained all day.
  • Reduce heavy lifting and repeated bending briefly if they sharply worsen leg symptoms, then reintroduce load progressively.
  • Use heat or a wrapped cold pack for short-term comfort if helpful, protecting the skin.
  • Notice neurological function—not just pain. Report new foot weakness, repeated tripping, inability to heel or toe walk, spreading numbness or bilateral symptoms.
  • Seek emergency care for any new bladder, bowel, saddle-sensation or sexual-function change associated with the episode.
  • Discuss medicines with a clinician or pharmacist, particularly if you have kidney, liver, stomach, heart or bleeding problems, are pregnant, or take anticoagulants or sedating medicines.
  • Do not suddenly stop long-term opioids, gabapentinoids or benzodiazepines without medical guidance because withdrawal can be harmful.

Treatment Depends on Neurological Findings and Recovery

Education and activity Understanding that most uncomplicated episodes improve supports safe movement and reduces fear. Activity is modified according to irritability, then progressed toward walking, work, lifting, sleep and sport goals.
Physiotherapy Treatment may include comfortable spinal and hip movement, nerve-sensitive loading, trunk and leg strength, aerobic conditioning and graded exposure. The response matters more than a universal exercise label.
Medicines Options require individual risk–benefit review. Current NICE guidance advises against routinely offering gabapentinoids, other antiepileptics, oral corticosteroids or benzodiazepines for sciatica, and against opioids for chronic sciatica.
Epidural injection An image-guided epidural local-anaesthetic and steroid injection may be considered for selected acute severe sciatica. It is not a routine cure and requires imaging review, medication planning and procedure-specific consent.
Higher-centre spine opinion Persistent disabling symptoms may justify referral when non-operative treatment has not improved pain or function and imaging matches the nerve pattern. Progressive weakness or cauda equina symptoms follow an urgent pathway.
Urgent decompression pathway Confirmed cauda equina compression and some rapidly progressive neurological deficits require emergency specialist management. This is different from elective review for persistent uncomplicated sciatica.

SR Speciality Hospital evaluates sciatica, monitors neurological function, coordinates appropriate imaging and provides suitable non-operative care. Spine injections, surgery and complex spinal procedures are referred to appropriate higher centres.

Useful Terms on a Lumbar MRI Report

Disc bulge A broad extension of disc tissue. It may be incidental and is not synonymous with a symptomatic herniation.
Protrusion A focal disc herniation whose base is wider than the outward portion.
Extrusion Disc material extends through the outer disc with a narrower connection or beyond the disc level.
Sequestered fragment Herniated disc material has separated from the parent disc. Symptoms and neurological findings guide urgency.
Nerve-root contact, displacement or compression Increasing degrees of interaction described by the radiologist; the clinical pattern still must agree.
Lateral-recess stenosis Narrowing along the route of a nerve before it exits the spinal canal.
Foraminal stenosis Narrowing in the opening through which a nerve root leaves the spine.
Central canal stenosis Narrowing around several nerve roots within the main canal, often relevant to walking-related bilateral symptoms.
Level notation: L4–L5 or L5–S1 The disc space is named by the vertebra above and below. The affected exiting and traversing nerves differ by location.
Clinical correlation advised The radiologist is stating that imaging alone cannot confirm which finding causes the patient's symptoms.

Myth vs Fact

Myth Any pain in the buttock is sciatica.
Fact Back, hip, gluteal and sacroiliac conditions can refer pain there without nerve-root irritation.
Myth Severe leg pain means the nerve is permanently damaged.
Fact Nerve inflammation can cause intense pain. Progressive weakness and functional loss are more important warning measures.
Myth A large disc on MRI always needs surgery.
Fact Many herniations improve without surgery. Neurology, recovery and imaging–symptom agreement guide referral.
Myth Complete bed rest protects the nerve.
Fact Prolonged rest increases weakness and disability. Short, tolerable activity generally supports recovery.
Myth Sciatica must always include back pain.
Fact Leg symptoms may dominate, and some patients report little lower-back pain.
Myth Tingling alone means cauda equina syndrome.
Fact Ordinary nerve-root irritation often causes tingling. New saddle, bladder, bowel or rapidly progressive bilateral symptoms are the emergency pattern.

Frequently Asked Questions

Is sciatica a disease?

It is a symptom pattern arising from irritation of a lower-spinal nerve root. The underlying cause may be a disc herniation, narrowing around a nerve or another less common condition.

Why is my leg pain worse than my back pain?

Nerve-root inflammation can produce intense symptoms along the leg even when local back pain is mild. Leg-dominant pain is common and does not by itself indicate a worse prognosis.

Does sciatica always go below the knee?

It often does, but not always. The complete pain route, altered sensation, weakness, reflexes and examination are more useful than applying one location rule.

How long does sciatica take to improve?

Recovery varies with cause, severity and neurological findings. Many disc-related episodes improve over weeks, while numbness and strength may recover more slowly. Worsening function needs reassessment rather than waiting for a fixed deadline.

Do I need MRI immediately?

Not for typical recent sciatica without red flags. MRI becomes urgent for suspected cauda equina or selected progressive deficits, and useful when persistent symptoms may lead to an injection or specialist surgical opinion.

Can an X-ray show a trapped nerve?

No. X-rays show bones and alignment, not the lumbar nerve roots or discs directly. They may answer a different question such as fracture or structural alignment.

Can ultrasound diagnose sciatica?

No. Ultrasound does not assess lumbar nerve roots inside the spinal canal. It may help investigate a separate hip, vascular, urinary or abdominal condition that resembles sciatica.

What is foot drop?

Foot drop means difficulty lifting the front of the foot, leading to toe dragging or a high-stepping gait. It can arise from a lumbar nerve root or a peripheral nerve and requires prompt assessment, particularly when new or worsening.

Should I stretch the sciatic nerve?

Aggressive stretching can aggravate an irritable nerve. Gentle movement or carefully dosed nerve-mobility exercises may be useful after assessment; they should not repeatedly reproduce severe spreading pain or worsening numbness.

Is walking good for sciatica?

Often yes in short tolerable amounts. Alternate walking with comfortable positions and build duration gradually. In spinal stenosis, walking tolerance may improve when leaning forward, while circulation problems require separate evaluation.

Do nerve-pain medicines cure sciatica?

They do not cure nerve-root compression. NICE advises against routinely offering gabapentinoids for sciatica because overall benefit has not been demonstrated and harms can occur. Do not stop an existing long-term medicine suddenly; seek a supervised review.

Will an epidural injection cure the disc?

No. A selected injection may reduce inflammation and pain temporarily in acute severe sciatica, helping function and rehabilitation. It does not mechanically return a disc to its previous shape and is not suitable for every patient.

Does a disc extrusion always require surgery?

No. Many extrusions improve without surgery. Emergency symptoms, progressive weakness, persistent disability and whether the MRI matches the clinical pattern guide referral.

When can I return to work, driving or the gym?

Return depends on leg control, comfortable sitting and movement, concentration, medicine effects and task demands. Modified duties and gradual loading are often preferable to waiting until every sensation has disappeared.

When is a spine-surgeon opinion needed?

Emergency referral is required for suspected cauda equina and selected rapidly progressive deficits. Persistent disabling sciatica may merit higher-centre review when appropriate non-operative treatment has not helped and MRI findings match the symptoms.

Related Patient Guides

These guides help distinguish lumbar nerve-root symptoms from nearby joint and vascular conditions.

Orthopaedics Back Pain Mechanical Pain / Imaging / Warning Signs Read patient guide → Orthopaedics Hip Pain Groin / Outer-Hip / Referred Pain Read patient guide → Orthopaedics Knee Pain Joint / Tendon / Referred Symptoms Read patient guide → Radiology Venous Doppler Ultrasound Leg Swelling / DVT / Venous Symptoms Read scan guide →

A Note From Our Doctors

The information on this page is intended to help you understand your condition. It should not be considered a diagnosis or a substitute for a consultation with a qualified medical professional.

Every patient is unique. The same symptom can have different causes in different individuals, and the most appropriate investigations and treatment depend on your medical history, examination findings, age, existing medical conditions and test results.

At SR Speciality Hospital, we believe in treating the whole patient—not just a symptom, scan or laboratory report. Every treatment plan is individualised after careful medical evaluation.

Orthopaedic Consultation

Is leg nerve pain limiting sleep, walking, work or ordinary activity?

Bring previous scans, reports and a medicine list. Mention the exact pain route, numb areas, weakness, falls, fever, trauma, cancer or infection history, and every new bladder, bowel, saddle-sensation or sexual-function change.

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