Find Out What Is Causing Your Symptoms

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Understanding what is causing your pain changes how you recover. A clinical assessment identifies the cause, explains why your symptoms are where they are, and gives you a clear plan. Same-week appointments available.

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Clinics: Moorgate (EC2)  | Strand (WC2)  |  Chiswick (W4)

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Quick Answers

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• Sciatica is irritation or compression of the sciatic nerve, the longest nerve in the body, running from the lower back to the foot.
• It is not a diagnosis in itself. It is a description of nerve pain with a specific distribution. The cause must be identified.
• Most cases resolve with the right physio therapy approach. Spontaneous resolution is also common, particularly in disc-related presentations.
• Sciatica is not dangerous for most people. The exception is cauda equina syndrome, which requires emergency attention.
• Understanding what is happening with your nerve is usually the most important first step in recovery.

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What Sciatica Actually Feels Like

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Before explaining the mechanism, it helps to confirm that what you are experiencing is likely sciatica. The symptoms are recognisable, and most people describe a consistent pattern.

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The most common description is a pain that starts in the lower back or buttock and travels down one leg. It maybe sharp, burning, or electric. It can feel like a bolt of lightning or a deep ache, depending on the severity of nerve irritation. Many people describe a catching sensation with certain movements, or a sudden jolt when they least expect it.

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Other common experiences include:

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• Tingling, numbness, or a pins-and-needles sensation in the leg, calf, or foot
• Weakness in the leg or foot, sometimes noticed as dragging the foot or difficulty standing on tiptoe
• Pain that is worse sitting, especially on hard or low surfaces
• Pain that eases with walking, at least initially, before returning with sustained activity
• Symptoms on one side only (rarely both sides at the same time)
• Night pain, particularly after a day of activity or sustained sitting
• A specific catch or sharp pain when bending forward, sneezing, or coughing — or when getting into a car, putting on socks, or sitting through along meeting
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Not everyone with sciatica has back pain. Some people have only leg symptoms, with no lower back involvement at all. This surprises many patients, but it is entirely consistent with the anatomy of the sciatic nerve. Many people also notice that symptoms are worse after driving, or that the only comfortable position late at night is pacing around. These are recognised patterns, not signs of something going wrong.

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“The first thing I try to establish with a patient is where exactly the pain is and where it travels. The distribution of symptoms tells us a great deal about which nerve root is involved and at what level. That shapes everything that comes next.”

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Dr Emma Collier PT, DPT, HCPC

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The Sciatic Nerve: What It Is and Where It Runs

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The sciatic nerve is the longest nerve in the body. It forms from several nerve roots exiting the lower spine(L4, L5, S1-S3), combines into a single nerve that passes through the buttock, and travels down the back of each leg to the foot. It is roughly the width of a finger at its widest point.

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As it travels down the leg, it supplies sensation and movement to the thigh, calf, ankle, and foot. This is why sciatica can produce symptoms anywhere from the buttock to the toes. The location of your symptoms helps identify which part of the nerve is involved, and at what level.

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Most people are surprised to learn that sciatic symptoms do not have to include back pain at all. Some patients experience only leg symptoms, with no lower back involvement. The nerve is long enough that the problem can originate at the spine while the pain is felt entirely in the calf or foot.

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Symptom location is clinically useful. Where exactly your pain, tingling, or weakness appears helps identify which nerve root is involved and at which spinal level. L4 typically affects the inner shin and ankle. L5 affects the outer shin, top of foot, and big toe, and is the most commonly involved level. S1 affects the back of the calf and outer foot, and may reduce the ankle reflex. The diagram above maps these distributions. Your physiotherapist will confirm the pattern through assessment.

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What Causes the Pain

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Sciatica is a symptom, not a diagnosis. It means the sciatic nerve is being irritated. There are several reasons this can happen, and identifying which one applies to you matters, because the treatment approach differs.

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Disc Herniation

The most common cause. The intervertebral discs sit between each vertebra and act as shock absorbers. Each disc has a tough outer ring and a soft gel-like centre. When the outer ring develops a weakness or tear, the inner material can press outward against a nearby nerve root. This is what is commonly called a slipped disc, though the disc does not actually slip. The pressure on the nerve root is what produces the sciatic symptoms.

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Chiu et al. (Clinical Rehabilitation, 2015) found that approximately 90% of herniated discs reduce in size spontaneously over time. This is one of the most reassuring findings in musculoskeletal medicine. The disc changes naturally without surgical intervention in the majority of cases, and symptoms resolve as the pressure on the nerve reduces.

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Nerve root compression from other structures

Bony changes such as bone spurs (osteophytes) from spinal degeneration can narrow the space through which nerve roots exit the spine. This is called foraminal stenosis. Unlike disc herniation, which can improve quickly, bony changes are structural and more persistent. Physiotherapy focuses on reducing the mechanical load on the affected level and improving the nerve's tolerance to movement.

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Piriformis syndrome

The piriformis muscle sits deep in the buttock and, in some people, the sciatic nerve runs directly through it rather than beneath it. When the piriformis becomes tight or overloaded, it can compress the nerve at this level. The pain pattern can be almost identical to disc-related sciatica, but the treatment emphasis is different. A clinical assessment distinguishes the two.

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Spinal stenosis

In spinal stenosis, the spinal canal itself narrows, reducing the space available for the spinal cord and nerve roots. It is more common in people over 60. The characteristic presentation is leg pain or heaviness that worsens with walking and is relieved by sitting or bending forward (called neurogenic claudication). It is an important distinction from vascular claudication, which has a similar presentation but a different cause.

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“The mistake is treating sciatica as a single condition. It is a symptom with several possible causes.Treating all of them the same way is why some people do not improve. The assessment is where the real clinical work happens.”

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Dr Emma Collier PT, DPT, HCPC

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What Sciatica Is Not

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Several things are commonly confused with sciatica, or incorrectly labelled as sciatica. Getting the distinction right matters for treatment.

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Not all leg pain is sciatica

Referred pain from the hip joint, sacroiliac joint dysfunction, and hamstring pathology can all produce symptoms that travel into the leg. The distribution is usually different from true sciatic nerve pain, and neural tension tests will be negative. A clinical assessment distinguishes these from genuine sciatic nerve irritation.

Not all back pain is sciatica

Simple mechanical low back pain, which is the most common form of back pain, does not involve nerve irritation. It tends to be localised to the lower back, without radiation below the knee, and without neurological symptoms such as tingling or weakness. It is managed differently and typically responds more quickly to treatment.

Sciatica is not a sign of permanent damage

This is probably the most important thing to understand. Most people with sciatica recover fully. The nerve is irritated or compressed, not severed or permanently damaged. Peul et al. (New England Journal of Medicine, 2007) found that outcomes for conservative physiotherapy management and surgical management were equivalent at one year for most disc-related presentations. The nerve has a strong capacity to recover, and most patients do not need surgery.

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Five Common Myths About Sciatica

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Much of what people believe about sciatica is either wrong or significantly overstated. These misconceptions are common enough that they are worth addressing directly, because they influence how people manage their symptoms and how quickly they recover.

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Myth 1: Sciatica always means a slipped disc.

False. Disc herniation is a common cause, but piriformis syndrome, foraminal stenosis, and spinal stenosis can all produce identical symptoms. The cause must be identified by assessment, not assumed. Treatment differs depending on the cause.

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Myth 2: You should rest until the pain goes away.

False. Hagen et al. (Cochrane, 2010) confirmed that bed rest produces no better outcomes than staying active. Prolonged rest stiffens the spine, weakens supporting muscles, and can intensify pain sensitivity. Guided movement is the evidence-based approach.

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Myth 3: Pain means damage.

False. Sciatic pain is nerve sensitivity, not ongoing tissue damage. A sensitised nerve produces pain in response to normal movement that would not cause pain in an unsensitised nerve. Vlaeyen and Linton (Pain, 2000) established that believing pain means damage is one of the strongest predictors of prolonged recovery. The pain is real and it is significant, but it is not a reliable signal that something is tearing or breaking.

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Myth 4: You will need an MRI or X-ray to find out what is wrong.

Usually false. NICE Guideline NG59 advises against routine imaging for sciatica. A thorough clinical assessment provides the information needed to identify the cause and plan treatment in most presentations. Imaging is reserved for specific indications: suspected cauda equina, progressive neurological deficit, or failure to improve after an appropriate course of treatment.

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Myth 5: Surgery is inevitable if sciatica does not improve quickly.

False. Peul et al. (New England Journal of Medicine, 2007) found equivalent outcomes between surgery and conservative management at one and two years for most disc-related presentations. Surgery is an option for specific indications, not a default. The large majority of patients managed conservatively do not require it.

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What the Evidence Says

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The evidence base for sciatica is extensive and largely reassuring. These are the most relevant findings for someone who has just been diagnosed.

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• Most disc herniations resolve on their own. Chiu et al. (Clinical Rehabilitation, 2015) found approximately 90% reduce in size without surgery.
• Physiotherapy is first-line treatment. NICE Guideline NG59 (2016, updated 2020) recommends physiotherapy for sciatica in preference to imaging and before considering surgical referral.
• Surgery is not superior in the long run. Peul et al. (New England Journal of Medicine, 2007) found equivalent outcomes between surgery and conservative management at one and two years.
• Staying active produces better outcomes. Hagen et al. (Cochrane, 2010) confirmed that bed rest is no better than remaining active. For most patients, careful movement accelerates recovery.
• Fear avoidance extends recovery. Vlaeyen and Linton (Pain, 2000) established that catastrophising and fear of movement are among the strongest predictors of prolonged disability. Understanding the condition tends to reduce both.

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Knowing what is wrong, and knowing that it is likely to improve, changes how the nervous system responds to pain. Patients who understand their diagnosis tend to recover faster than those who do not.  This is not anecdotal. It is supported by the research on pain neuroscience education as a therapeutic intervention, and it is one reason a good assessment does more than identify a diagnosis. It begins the recovery process.

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What Recovery Typically Looks Like

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Recovery from sciatica is rarely linear, and it is worth knowing this before you start. Most people have good days and bad days, and a flare-up after a more active period is normal rather than a sign of damage.  Nerve tissue is sensitive. It responds to sustained load or unfamiliar movement with a temporary increase in symptoms. That response is not harm. It is the nervous system being cautious, and it settles. Progress is best measured over weeks, not individual days. The goal of physiotherapy is to gradually expand what the nerve can tolerate, not to protect it from all movement.

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Acute phase (first 2-6 weeks)

In the acute phase, the priority is reducing nerve irritation and restoring comfortable movement. Positions and movements that bring symptoms back towards the spine and away from the leg are generally a good sign.  Neural mobilisation exercises, posture modification, and activity guidance are the primary tools at this stage. Most patients see meaningful improvement within this period.

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Recovery phase (6-12 weeks)

As nerve sensitivity decreases, rehabilitation moves towards restoring strength, movement range, and confidence. Direction-specific exercises, matched to how your body moves best, form the core of this phase. Browder, Childs, Cleland and Fritz (Physical Therapy, 2007) demonstrated that exercises matched to the individual's movement pattern produce significantly better outcomes than generic approaches. A common mistake at this stage is stopping treatment the moment symptoms reduce. The nerve needs progressive loading to recover fully, and premature return to normal activity without graduated rehabilitation often leads to recurrence.

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Return to full activity

For most people, full return to previous activities is a realistic goal. The timeline varies: most acute disc-related presentations improve significantly within 6-12 weeks. Longer-standing presentations, or those with significant stenosis, may take longer. A small number of patients require onward referral for imaging or surgical assessment. Atherapy clinicians will tell you directly if your presentation warrants a different pathway.

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When to Seek Urgent Help

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The vast majority of sciatica isnot a medical emergency. There is, however, one presentation that requiresimmediate action.

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You should also see your GPpromptly (within a few days) if you have sciatica alongside unexplained weightloss, fever, night sweats, or pain that is constant regardless of position.These features warrant further investigation to exclude rarer causes.

Evidence References

References cited on this page

• Chiu CC, Chuang TY, Chang KH, Wu CH, Lin PW, Hsu WY. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clinical Rehabilitation. 2015;29(2):184-195. DOI: 10.1177/0269215514540919.
• Peul WC, van Houwelingen HC, van den Hout WB, et al. Surgery versus prolonged conservative treatment for sciatica. New England Journal of Medicine. 2007;356(22):2245-2256. DOI: 10.1056/NEJMoa064039.
• Browder DA, Childs JD, Cleland JA, Fritz JM. Effectiveness of an extension-oriented treatment approach in a subgroup of subjects with low back pain. Physical Therapy. 2007;87(12):1608-1618. DOI: 10.2522/ptj.20060297.
• Hagen KB, Jamtvedt G, Hilde G, Winnem MF. Bed rest for low back pain and sciatica. Cochrane Database of Systematic Reviews. 2010. DOI: 10.1002/14651858.CD001254.
• Vlaeyen JWS, Linton SJ. Fear-avoidance and its consequences in chronic musculoskeletal pain: a state of the art. Pain. 2000;85(3):317-332. DOI: 10.1016/S0304-3959(99)00242-0.
• NICE Guideline NG59. Low back pain and sciatica in over 16s: assessment and management. 2016 (updated 2020). www.nice.org.uk/guidance/ng59.
• Todd NV. Cauda equina syndrome: the timing of surgery probably does influence outcome. British Journal of Neurosurgery. 2005;19(4):301-306.

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