By Andrew Cunningham — Chiropractor, B.Health.Sc/B.App.Sc(Chiro)
Published: 17 March 2026
Important: Seek medical care right away if you have problems controlling your bladder or bowels, or numbness in your genital or anal area. If a local doctor is not available, go to your nearest urgent care clinic or hospital emergency department. Seek urgent medical care for sudden lower-back pain accompanied by tingling, numbness or weakness in your legs.
There’s a specific kind of misery to sciatica that people who haven’t had it can’t quite picture.
It’s not just the pain — it’s the way it travels. Starting somewhere in the lower back or buttock, it moves down the back of the thigh, sometimes all the way into the calf or foot, sometimes with burning, sometimes with a deep ache, sometimes with pins and needles that make you wonder if your leg is about to stop working altogether. Sitting makes it worse. Standing up from sitting is often the worst moment of the day. Long drives become an exercise in gritted teeth. Sleep, when it comes, is a relief — until you roll over and the whole thing starts again.
If that sounds familiar, you’re not alone. Sciatica is one of the most common musculoskeletal complaints, with epidemiological reviews estimating a lifetime prevalence of 13–40% depending on how sciatica is defined and measured. And yet it remains one of the most inconsistently managed conditions — often addressed with pain relief and a wait-and-see approach, when the actual path forward depends on identifying the specific cause.
At Advanced Health in Preston, sciatica is one of the most common presentations we assess. This article explains what’s actually happening in your body, why the cause matters more than the symptom, and how a thorough chiropractic assessment can help guide appropriate management.
Sciatica Is a Symptom, Not a Diagnosis
This is the most important thing to understand — and the thing most people are never told.
When your doctor writes “sciatica” on a referral or a scan request, they are describing what you are experiencing: pain travelling along the sciatic nerve. They are not telling you why. The why matters enormously, because sciatica has multiple distinct causes, each of which responds to different management approaches. Addressing them all the same way — which can happen when the focus is on pain relief rather than mechanical diagnosis — is why some people spend months cycling through approaches that don’t resolve the underlying issue.
The sciatic nerve is the longest and widest nerve in the human body. It forms from several nerve roots in the lower lumbar spine (L4, L5) and sacrum (S1, S2, S3), merges into a single nerve trunk that runs through the buttock, and then travels down the back of each leg, splitting into smaller branches that supply sensation and motor function to almost the entire lower limb. When any part of this nerve is compressed, stretched, or irritated — anywhere along that path — the result is the familiar radiating pain, numbness, or weakness.
The question, then, is what is doing the compressing or irritating. That’s where the clinical picture gets more nuanced, and where a thorough assessment becomes essential.
The Four Main Causes of Sciatica
1. Lumbar Disc Herniation
This is the most common cause of true sciatica, accounting for the majority of cases. Between each pair of lumbar vertebrae sits an intervertebral disc — a structure with a tough outer ring (the annulus fibrosus) and a gel-like inner core (the nucleus pulposus). Under sufficient load or stress, particularly when the spine is repeatedly flexed under load (think: years of desk work, heavy lifting with poor mechanics, or sustained forward-bent postures), the outer ring can develop small tears. Over time, the inner nucleus can push through these tears and bulge outward — a disc herniation.
When the herniation occurs toward the back of the disc, near the exiting nerve roots, it can compress the sciatic nerve at its origin. This is classic disc-related sciatica: a specific pain pattern that corresponds to the nerve root being compressed, often with associated neurological signs like weakness in specific muscle groups or reduced reflexes at the ankle or knee.
2. Piriformis Syndrome
The piriformis is a small but powerful external hip rotator muscle buried deep in the buttock. It lies directly over the sciatic nerve — and a systematic review and meta-analysis estimated that anatomical variants in the relationship between the sciatic nerve and piriformis have a pooled prevalence of 13% (95% confidence interval 10–16%). The most common variant involves one division of the nerve passing through a split in the muscle.
When the piriformis becomes tight, hypertonic, or inflamed — as it often does in runners, cyclists, people with hip imbalances, and those who spend long periods sitting on hard surfaces — it can compress the sciatic nerve as it passes through or beneath it. The resulting pain is often initially attributed to lumbar disc involvement, but the distribution and character can be subtly different, and the management approach is entirely different.
This distinction matters clinically. Some presentations involve extensive lumbar investigations that find no spinal source, because the origin is in the soft tissue of the buttock rather than the spine itself.
3. Spinal Stenosis
Spinal stenosis refers to a narrowing of the spinal canal — the bony channel through which the spinal cord and nerve roots travel. This narrowing compresses the neural structures inside it, leading to pain, weakness, and sometimes the characteristic feature of stenosis-related sciatica: symptoms that worsen with walking or standing and improve with sitting or leaning forward (because flexion opens the spinal canal slightly, temporarily reducing the compression).
Stenosis is more common in middle-aged and older patients, and typically develops as a consequence of degenerative changes: bone spurs, thickened ligaments, and disc height loss that accumulate over years. It is often manageable with conservative care, though severe cases may require surgical consideration.
4. Sacroiliac Joint Dysfunction
The sacroiliac (SI) joints sit on either side of the sacrum at the base of the spine, connecting it to the pelvis. These joints absorb enormous force during everyday activities — walking, climbing stairs, getting in and out of cars — and when they become hypermobile, inflamed, or mechanically dysfunctional, they can produce a pain pattern that closely mimics lumbar or nerve-related sciatica: deep buttock pain with referral into the posterior thigh.
SI joint dysfunction is one of the most commonly underrecognised contributors to lower back and leg pain. Diagnostic injection studies estimate that up to 25% of chronic low back pain may originate from the sacroiliac joint, with the broader clinical literature citing a range of 13–30%. Targeted chiropractic management and stabilising exercise are established conservative approaches for this presentation. See also our page on sacroiliac joint pain relief in Preston.
Why Sciatica Is Often Managed Generically
The conventional approach to sciatica — particularly in the early and acute phase — often follows a standard pathway: NSAIDs (anti-inflammatory medication) or muscle relaxants, possibly a short course of stronger pain relief, a referral for physiotherapy, and instructions to rest. If symptoms persist, an MRI is ordered and a spinal specialist may be consulted.
The challenge in this pathway is not that any individual component is inappropriate. It is that time-limited consultations often focus on symptom management rather than mechanical diagnosis. Sciatica is treated as a single condition rather than a collection of different presentations that happen to produce similar symptoms.
Prolonged rest, in particular, can be counterproductive for many sciatica presentations. The lumbar spine and pelvis are dynamic structures that respond to movement. When movement is avoided — lying still, skipping the activities that provoke symptoms, waiting for the pain to settle — the muscles that support the lumbar spine can weaken, the joints stiffen, and the discs (which rely on movement for nutrient exchange) become increasingly compromised.
The other significant gap is the absence of a thorough mechanical diagnosis. Imaging tells you what structural findings are present; it doesn’t tell you which of those findings are actually producing the pain. Clinical experience in musculoskeletal assessment makes it clear that imaging findings and symptom severity often don’t correlate. Many people with disc bulges on MRI have no sciatica. Some people with significant sciatica have normal-looking scans. The clinical assessment — how the person moves, what aggravates and relieves their symptoms, what neurological tests reveal — is what determines the working diagnosis.
How Chiropractic Assessment Addresses Sciatica
When you see a chiropractor in Preston for sciatica, the assessment aims to establish, as precisely as possible, what is producing your symptoms — and to develop a management plan specific to that cause.
A thorough chiropractic assessment for sciatica includes:
Lumbar and pelvic assessment — examining joint mobility, segmental restrictions, and the mechanical behaviour of each lumbar level under various loading positions. This identifies where mobility is reduced, where there may be disc-related involvement, and how the spine responds to sustained postures.
Neurological testing — testing reflexes, sensation, and muscle strength in the lower limbs to identify whether there is genuine nerve root compromise and, if so, at which level. This is crucial information that shapes both the management approach and the urgency of care.
Hip and SI joint assessment — a set of provocative tests specifically targeting the sacroiliac joints, hip flexors, and piriformis to determine whether the source of the problem is in the pelvis rather than the spine.
Postural and movement analysis — because sciatica doesn’t exist in isolation. The way someone stands, sits, and moves through daily life has usually contributed to the problem, and understanding that mechanical picture is part of developing a management plan that holds.
Once the cause is identified, management is targeted to that presentation. Care at Advanced Health may include spinal manipulation, deep tissue therapy, dry needling, shockwave therapy, functional training and Clinical Pilates. For some lower-back-pain and sciatica presentations, active rehabilitation also includes a gym session at Snap Preston. Not every person needs every option; the mix depends on the working diagnosis and how the presentation responds.
The goal is not simply to reduce pain in the short term. The goal is to identify and address the structural and mechanical reason the nerve is being irritated — and to give you a clear pathway for maintaining progress.
What to Expect in Your First Few Appointments
People are often surprised by how much of the first visit is spent on assessment rather than hands-on treatment. That’s intentional. An accurate working diagnosis is the most important part of managing sciatica well — more important than starting treatment quickly.
Your first visit at Advanced Health will typically include a thorough history of your symptoms (how they started, how they behave, what makes them better and worse), a detailed physical examination, and an initial treatment if appropriate. You’ll leave with a clear understanding of what we believe is contributing to your sciatica, what the management plan involves, and what to do at home in the meantime.
Progress varies by presentation. Some patients notice changes early in the course of care — often a reduction in the distal symptoms (foot and calf) that can signal the nerve irritation is settling. Others require a longer management period, particularly when the condition has been present for months or years. The timeline depends on the nature of the underlying cause, how long it has been present, and how consistently the patient engages with the active rehabilitation component.
What we consistently observe is that patients who combine hands-on chiropractic care with active participation — doing the prescribed exercises, modifying aggravating activities, addressing the postural and ergonomic factors that contributed to the problem — tend to make more consistent progress than those who rely solely on passive treatment.
Managing Sciatica Day to Day
While you’re working through a management plan, a few general principles tend to apply across most presentations. These are general guidelines — your chiropractor will provide advice specific to your situation.
Movement matters. Gentle, pain-aware movement — short walks, careful stretching, staying active within comfortable limits — is generally preferable to bed rest for most sciatica presentations. The exception is when neurological symptoms (significant weakness, loss of bladder or bowel control) are present, in which case urgent medical attention is warranted.
Leave the first 48–72 hours, then consider heat. After the first 48–72 hours of an acute flare, heat may be used to help reduce muscle spasm. Heat is not appropriate for every presentation and is not guaranteed to reduce symptoms. Follow the advice given for your specific assessment rather than treating this as a universal instruction.
Avoid sustained sitting where possible. If your job requires long periods at a desk, standing up every 30–40 minutes and taking a short walk is one of the simplest interventions for managing disc-related sciatica during recovery. Intradiscal pressure measurements show that unsupported sitting increases lumbar disc load compared with standing.
Be mindful of forward bending under load. For disc-related presentations specifically, activities that involve sustained lumbar flexion — picking things up from the floor, loading the dishwasher, gardening — can aggravate the affected disc. Squatting rather than hinging, and keeping the back as neutral as possible, can make a meaningful difference during the recovery period.
When to Seek Assessment
Sciatica is commonly managed with conservative care. The key is getting an accurate working diagnosis and a management plan that addresses the actual cause rather than just the symptoms.
At Advanced Health in Preston, our chiropractors bring a thorough, evidence-informed approach to sciatica assessment — one that begins with understanding your individual presentation and develops a plan aimed at restoring comfortable movement and maintaining progress.
Whether you’re in Preston, Thornbury, Reservoir, Northcote, or anywhere across Melbourne’s north, we welcome the opportunity to assess your presentation.
Book an appointment or call us on (03) 9484 9185.
We’re open 7 days — weekdays from 8:00 am to 9:00 pm, Saturdays from 7:30 am, and Sundays from 9:00 am.
4/107 Plenty Road, Preston VIC 3072
This article is for general educational purposes only and does not constitute individual clinical advice. If you are experiencing sciatica with progressive neurological symptoms — including new leg weakness, or any loss of bladder or bowel control — please seek urgent medical attention.
References
- Konstantinou K, Dunn KM. Sciatica: Review of Epidemiological Studies and Prevalence Estimates. Spine. 2008;33(22):2464–2472. Also Stafford MA et al. Sciatica: a review of history, epidemiology, pathogenesis, and the role of epidural steroid injection in management. BJA. 2007;99(4):461–473.
- Smoll NR. Variations of the piriformis and sciatic nerve with clinical consequence: a review. Clin Anat. 2010;23(1):8–17. Also Natsis K et al. Sciatic Nerve Variants and the Piriformis Muscle: A Systematic Review and Meta-Analysis. Cureus. 2020;12(12):e12261.
- Cohen SP. Sacroiliac Joint Pain: A Comprehensive Review of Anatomy, Diagnosis, and Treatment. Anesth Analg. 2005;101(5):1440–1453. Also Newman DP, Soto AT. Sacroiliac Joint Dysfunction: Diagnosis and Treatment. Am Fam Physician. 2022;105(3):239–245.
- HealthDirect Australia. Sciatica. Australian Government health information service. healthdirect.gov.au/sciatica.
- Nachemson A. The load on lumbar disks in different positions of the body. Clin Orthop Relat Res. 1966;45:107–122. Also Wilke HJ et al. New in vivo measurements of pressures in the intervertebral disc in daily life. Spine. 1999;24(8):755–762. Also Li JQ et al. Comparison of In Vivo Intradiscal Pressure between Sitting and Standing in Human Lumbar Spine: A Systematic Review and Meta-Analysis. PeerJ. 2023;11:e16176.
