Sciatica back pain: Causes, symptoms and physio treatment

Sciatica is one of the more worrying-sounding kinds of back pain – but with the right assessment and treatment most people improve without surgery. This blog explains what sciatica is, why it happens, who’s at risk, common signs, and the physiotherapy-led treatments that help.

What is sciatica?

‘Sciatica’ describes pain caused by irritation or compression of the sciatic nerve (or the nerves that form it). The pain usually starts in the low back or buttock and travels down the back of the thigh and into the lower leg and foot. It can be accompanied by numbness, pins-and-needles, or weakness in the leg. Sciatica is a symptom – not a single diagnosis – and can come from several different problems in the spine or surrounding tissues.

Common causes

• Lumbar disc herniation (slipped disc) – a disc presses on a nerve root (very common cause in younger adults)
• Lumbar spinal stenosis – narrowing of the spinal canal or nerve root openings (more common in older adults)
• Degenerative changes (facet joint arthritis, spondylolisthesis) that irritate nerve roots
• Radicular irritation without clear structural compression (chemical inflammation around the nerve)
• Peripheral entrapment (e.g., piriformis syndrome) – the sciatic nerve can be irritated by tight muscles outside the spine
• Rare but important: tumours, infections, or trauma. These are uncommon causes and usually have other red-flag signs

How common is sciatica?

Prevalence estimates vary depending on how sciatica is defined, but lifetime rates are often quoted between about 10-40%, with an annual incidence around 1-5% in many populations. Wide ranges in published data reflect different definitions and study methods. Low back pain and sciatica together are a leading cause of disability worldwide.

Who’s at higher risk?

Risk factors that increase the chance of developing sciatica include:  

• Age (peak in middle age/40s)
• Physically demanding work (heavy lifting, repetitive bending or twisting)
• Prolonged sitting or driving
• Smoking, obesity and low physical fitness
• Certain metabolic conditions (e.g., diabetes) and possibly genetic predisposition

Typical signs and symptoms

• Radiating leg pain (from buttock down the back of the thigh, often below the knee) – usually one side
• Numbness or tingling (pins-and-needles) in the leg or foot
• Muscle weakness in the leg or foot (e.g., difficulty lifting the foot)
• Pain worsened by coughing, sneezing or sitting in many cases
• Limited straight-leg raise test and neurological findings on examination. 

Red flags – urgent referral: if someone has new bladder or bowel dysfunction, saddle numbness (around the groin), rapidly progressive leg weakness, or severe unrelenting night pain – they must get immediate medical assessment (possible cauda equina syndrome, infection or tumour).

How is sciatica diagnosed?

Diagnosis usually starts with a clinical history and a focused physical exam (neuro exam, special tests such as straight-leg raise). Imaging (MRI) is not always needed initially and is reserved for cases with red flags, progressive neurological deficit, severe symptoms not improving with conservative care, or when surgery is being considered. Current guidance recommends clinical assessment first and use of MRI selectively.

Physiotherapy treatment options – what we do and why

Physiotherapy is a first-line treatment for most people with sciatica. The aim is to reduce pain, restore function, improve movement and prevent recurrence. Current guidance supports exercise-based rehabilitation and considers manual therapy as part of a package – but the best approach is routinely individualised to the patient.

Core elements of physiotherapy care

1. Education and reassurance
   • Clear explanation of the diagnosis, natural history (many improve with time), activity advice and pain management strategies. Education reduces fear, encourages gradual return to normal activity and improves outcomes.
     
2. Individualised exercise therapy
   • Active exercises to restore movement and strengthen the trunk and hip muscles, graded return to activity, and tailored programmes (including directional preference/McKenzie in some cases, motor control and progressive strengthening). Exercise is the central evidence-supported component of physio care.
3. Neural mobilisation (nerve glides/sliders)
   • Techniques that gently mobilise the nerve can reduce nerve sensitivity and pain in some people with lumbar radiculopathy. Recent systematic reviews show benefit for pain and function when neural mobilisation is added to other care.
4. Manual therapy (as part of a package)
   • Spinal mobilisation, soft-tissue techniques or gentle manipulation can be useful short-term to reduce pain and allow exercise to progress – but these are recommended alongside exercise rather than as standalone cures.
5. Activity and ergonomic advice
   • Guidance for work, driving and returning to sport; adaptations to reduce loading while maintaining mobility.
6. Self-management and pacing
   • Home exercise programmes, gradual increases in activity, and strategies to manage flare-ups.
7. Adjuncts when appropriate
   • Taping, dry needling, or electrotherapy may be used selectively but have limited high-quality long-term evidence. Psychological approaches (CBT-style) can be integrated for people whose pain is influenced by fear, catastrophising or depression.

What results can patients expect from physiotherapy?

Many people with sciatica improve substantially with conservative care over weeks to months. Research shows physiotherapy, exercise and neural mobilisation can reduce pain and disability – though evidence varies and no single non-surgical treatment is proven superior in all cases. If symptoms are severe or persistent, further medical options may be considered.

When physiotherapy isn’t enough – other treatment options

If there is no improvement with conservative care, or if neurological signs worsen, options include:  

• Medications – short-term analgesics, non-steroidal anti-inflammatory drugs (NSAIDs) and sometimes neuropathic pain medicines (e.g., gabapentin) – used under medical supervision.
• Epidural steroid injections – may provide short-term symptom relief for some people with radicular pain. Evidence of long-term benefit is mixed; decisions are individualised.
• Surgery – when a clear surgical target exists (e.g., a large disc herniation compressing a nerve) and symptoms are severe, progressive, or not improving after an appropriate period of conservative care. Common procedures include microdiscectomy (removal of herniated disc fragment) or decompression/laminectomy for spinal stenosis. Urgent surgery is required for cauda equina syndrome.   

A multi-disciplinary approach (physio + pain medicine + psychology + surgeon when needed) often produces the best outcomes for persistent cases.

How we can help at Synergy Physio in Surrey

• Comprehensive assessment – full history and neurological screen to identify red flags and the likely source of symptoms

• Individualised treatment plan – tailored exercise programme, neural mobilisation where appropriate, manual therapy as required, and progressive strengthening and conditioning 

• Hands-on treatment plus self-management – we teach home exercises and flare-up strategies so patients feel confident returning to work/sport

• Workplace and ergonomic advice – practical changes to reduce recurrence risk

• Fast referral pathways – for imaging, specialist opinions, pain clinics or surgical assessment if we identify red flags or poor progress despite conservative care

Typical pathway: short course of guided physiotherapy (2-8 sessions over 6-12 weeks), re-assess progress, escalate care or liaise with GP/specialist if symptoms persist or neurological deficits increase.

Practical self-care tips for someone with sciatica today

• Keep moving within comfort – avoid prolonged bed rest. Short walks and gentle movement are helpful.
• Use pain relief wisely (follow GP/pharmacist advice). Ice or heat can be tried for short-term symptom relief.
• Start a graded home exercise programme – light walking and the specific stretches/strengthening your physiotherapist prescribes.
• Modify activities that trigger severe leg pain (heavy lifting, long drives) while gradually rebuilding tolerance.
• See your physiotherapist or GP urgently if you develop bladder/bowel changes, saddle numbness, or progressive leg weakness.

To summarise

• Sciatica is common and usually improves with conservative, physiotherapy-led care.
• Key physiotherapy tools are education, exercise, graded activity, neural mobilisation, and manual therapy as part of a package.
• Urgent medical review is required for red flags (cauda equina signs, rapidly progressing weakness).
• Sciatica symptoms can take up too a year to disappear if left untreated. With treatment expected results are from 4-12 weeks depending on the severity of symptoms and how well the body responds to treatment. 

 If you would like to speak to a physiotherapist then please get in touch. Book an appointment with a physio online.