Uncovering the Roots: What Really Causes Back Pain? A Physiotherapist Explains
Physiotherapy, Spine & Posture Health, Back Pain & Rehabilitation, Pain Science, Patient Education
What Really Causes Back Pain? A Physiotherapist Breaks Down the Root Causes
Clinical insight | Spinal Health | Back Pain Rehabilitation
Back Pain Is Common. Understanding It Is Rarer Than You'd Think.
Nearly 80% of people will experience back pain at some point in their lives. It is one of the leading causes of workplace absence globally, a primary driver of long-term disability, and — despite its prevalence — one of the most frequently misunderstood conditions in primary healthcare.
The misunderstanding starts early. Most people attribute their back pain to a single identifiable event: a heavy lift, a fall, a bad night's sleep. And while acute injury is a legitimate cause, it accounts for far less back pain than the clinical picture suggests. The majority of cases presenting to physiotherapy have no single precipitating trauma. Instead, they represent the accumulated consequence of months or years of postural load, muscular imbalance, habitual movement dysfunction, and — increasingly — chronic psychological stress.
This matters because the framing of the problem determines the treatment. If back pain is understood as injury, the response is rest and recovery. If it is understood as dysfunction — structural, neuromuscular, or biopsychosocial — the response is rehabilitation. The evidence overwhelmingly supports the latter.
Here is what the clinical picture actually looks like.
1. Poor Posture and Prolonged Sitting: The Slow, Structural Drain
The relationship between sustained sedentary posture and low back pain is not intuitive — sitting feels passive, not damaging. But from a spinal mechanics perspective, sustained flexed posture is one of the most demanding states the lumbar spine can be placed in.
When you sit with a rounded lumbar spine for extended periods, the posterior annulus of the intervertebral disc bears disproportionate compressive load. Simultaneously, the posterior spinal ligaments are placed under sustained stretch, the deep lumbar stabilisers — particularly the multifidus — progressively disengage, and the hip flexors adaptively shorten. Over time, this configuration becomes the body's default: anterior pelvic tilt increases, lumbar lordosis is either exaggerated or lost entirely depending on the direction of the postural collapse, and the body is perpetually working against its own structural inefficiency.
The clinical consequence is not just pain during sitting. It is a spine that has lost its capacity to self-organise — to find and maintain an efficient, low-load position without deliberate effort.
What physiotherapy addresses:
Lumbar mobilisation, segmental stabilisation retraining, ergonomic workstation assessment, and progressive endurance-based core work to restore the passive and active support systems that sustained sitting has eroded.
A practical intervention: Microbreaks matter significantly more than most patients expect. The evidence on postural variation suggests that brief, frequent movement breaks — standing, gentle extension, walking — do more to protect the lumbar spine than any single corrective posture held for a prolonged period. Aim for postural variation every 20–30 minutes rather than perfection in a fixed position.
2. Muscle Imbalance and Core Dysfunction: The Hidden Architecture of Pain
Of all the contributing factors to chronic low back pain, muscle imbalance is perhaps the most systematically underestimated — in part because it produces no acute injury, no dramatic onset, and no visible change on imaging.
The deep stabilising system of the lumbar spine — comprising the transversus abdominis, multifidus, pelvic floor, and diaphragm — functions as an anticipatory system. In a healthy spine, these muscles activate fractionally before any limb movement, pre-tensioning the lumbar region before load arrives. This feedforward mechanism is the foundation of spinal stability.
In patients with chronic low back pain, this system is frequently disrupted. Research by Hodges and Richardson (1996) demonstrated that in individuals with low back pain, the transversus abdominis activation is delayed — the global mobiliser muscles fire first, creating movement without prior stabilisation. The result is a spine that moves before it is supported, and that accumulates micro-instability across thousands of daily repetitions.
Compounding this is the predictable pattern of muscle imbalance that develops in sedentary populations: tight, overactive hip flexors and lumbar erector spinae on one hand; inhibited, underactive gluteals, deep abdominals, and mid-thoracic stabilisers on the other. This pattern produces anterior pelvic tilt, increased lumbar lordosis, and excessive shear forces through the L4–L5 and L5–S1 segments — precisely the levels where disc pathology and facet joint degeneration most commonly occur.
What physiotherapy addresses:
A thorough functional assessment identifies the specific pattern of imbalance. Treatment begins with motor control — reactivating inhibited stabilisers before loading them — followed by a progressive strengthening programme targeting the posterior chain and deep core, and systematic mobility work to restore length in shortened structures.
3. Spinal Pathology and Degenerative Change: When Structure Is the Source
Not all back pain is postural or functional in origin. A meaningful proportion of patients present with identifiable structural pathology — and understanding the distinction matters for treatment planning.
Intervertebral disc herniation occurs when the nucleus pulposus migrates through a weakened posterior annulus and contacts adjacent neural structures. The result ranges from localised back pain to full radiculopathy — sharp, electrical pain, paraesthesia, or weakness radiating into the leg along a predictable dermatomal pattern. The clinical trajectory of disc herniation is generally more favourable than patients expect: the majority of contained herniations show significant resorption within 6–12 months, and physiotherapy-led rehabilitation has been shown to be as effective as surgical intervention in most non-emergency presentations.
Spinal stenosis — narrowing of the spinal canal or neuroforamina — produces a characteristic pattern: pain, heaviness, and cramping in the legs brought on by walking or sustained standing, and relieved by sitting or lumbar flexion. This neurogenic claudication pattern is clinically distinct from vascular claudication and guides specific physiotherapy approaches, including flexion-biased exercise and aquatic therapy where appropriate.
Facet joint arthrosis and spondylolisthesis produce their own clinical signatures, each requiring a tailored rehabilitation approach that accounts for the specific structural compromise while building the muscular competence to unload the affected segment.
The critical point: A diagnosis on imaging is not, by itself, a treatment plan. Many structural findings on MRI are incidental in asymptomatic populations — disc bulges, degenerative changes, and facet hypertrophy increase in prevalence with age independent of pain. The clinician's role is to correlate imaging findings with clinical presentation and direct treatment accordingly.
4. Psychological Stress and the Neuroscience of Pain: A Relationship the Research Has Settled
The idea that emotional stress "causes" back pain is sometimes met with scepticism — a suggestion, patients fear, that their pain is not real or is somehow self-generated. The neuroscience tells a more sophisticated and more validating story.
Pain is not a signal that travels unchanged from a damaged tissue to a conscious experience. It is a construct — an output of the central nervous system, shaped by tissue input but also by context, expectation, prior experience, and emotional state. The same nociceptive input can produce dramatically different pain experiences depending on the psychological environment in which it is processed.
Chronic psychological stress elevates cortisol, sustains sympathetic nervous system activation, increases generalised muscular tension (with a particular predisposition toward the trapezius, suboccipitals, and paraspinal muscles of the lumbar spine), and — critically — sensitises the central nervous system. In a sensitised nervous system, stimuli that would ordinarily be innocuous are processed as threatening. Pain thresholds fall. The area of perceived pain spreads. Recovery from acute episodes becomes slower.
This is not psychosomatic in the dismissive sense. It is neurobiology. And it has direct clinical implications: rehabilitation programmes that address only the structural component while ignoring the psychological landscape have consistently poorer long-term outcomes than those that integrate both.
What physiotherapy addresses: Pain neuroscience education — helping patients understand the biology of their pain — has strong evidence as a clinical intervention in its own right. Combined with graded exposure to feared movements, breathing-based nervous system regulation, and where appropriate, collaborative referral to psychological support, a biopsychosocial treatment model consistently outperforms a purely biomedical one.
5. Habitual Movement and Lifestyle Factors: The Compounding Variables
Structural assessments and clinical diagnoses account for the mechanisms of back pain. But the daily environment in which a person lives either compounds or ameliorates those mechanisms — and this dimension of the clinical picture is frequently under-addressed.
Lifting mechanics are a significant variable. Sustained flexion under load — reaching forward with a rounded lumbar spine to lift a box, a child, or a bag of groceries — places extreme shear force through the posterior disc and facet structures. Learning to hinge at the hip rather than flex at the lumbar spine, and to brace the core before initiating a lift, reduces this load substantially.
Sleep surface and position influence nocturnal spinal loading. A mattress that fails to support the lumbar spine in a neutral position allows sustained positional strain across 6–8 hours — a meaningful contribution to morning stiffness and pain, and a factor that patients rarely consider in their self-management.
Deconditioning through inactivity creates a well-documented cycle: pain leads to activity avoidance, avoidance leads to weakening of the stabilising musculature, weakness increases vulnerability to load, load produces pain. Breaking this cycle requires graded, progressive return to movement — not rest.
Footwear and lower limb biomechanics feed directly into the kinetic chain. Excessive pronation, leg length discrepancy, and inadequate arch support alter pelvic mechanics and can directly drive or perpetuate lumbar symptoms.
How Physiotherapy Addresses Back Pain at Its Root
Effective physiotherapy for back pain is not a passive experience. It is not primarily about treatment applied to a patient — heat, ultrasound, massage in isolation. It is a clinical partnership in which assessment findings drive a specific, progressive, and evolving treatment plan.
A comprehensive physiotherapy programme for back pain includes:
Thorough clinical assessment — postural analysis, movement screening, muscle function testing, neurological examination where indicated, and a detailed history that accounts for psychosocial factors alongside physical ones.
Manual therapy — joint mobilisation and manipulation to restore segmental mobility; soft tissue techniques to reduce hypertonicity and improve tissue extensibility; neural mobilisation where nerve tension is contributing to the symptom picture.
Targeted exercise rehabilitation — beginning with motor control and stabilisation (reactivating the deep system), progressing to local and global strengthening, and ultimately incorporating functional movement patterns that replicate the specific demands of the patient's daily life and occupation.
Education and self-management — the evidence on pain neuroscience education is clear: patients who understand the biology of their pain manage it better. Understanding that movement is protective, that imaging findings are not deterministic, and that recovery is achievable changes both behaviour and outcome.
Ergonomic and lifestyle guidance — workstation assessment, sleep position advice, activity modification, and graded return to sport or occupation.
The goal is not pain management. It is restoration of function, confidence in movement, and the structural and neuromuscular resilience to prevent recurrence.
Back Pain Is Not Inevitable — and It Is Not Permanent
The clinical evidence is consistent and encouraging: back pain, even when chronic, responds to well-designed rehabilitation. The factors that predict poor outcome are not structural severity but rather avoidance behaviour, low self-efficacy, and absence of treatment.
Understanding the root cause of your back pain is the beginning of meaningful change. It shifts the framework from passive suffering to active recovery — from waiting for pain to resolve to building a body that is genuinely more resilient.
Physiotherapy provides the clinical roadmap. The results belong to the patient.
Book a back pain assessment with our physiotherapy team.
We'll identify the specific drivers of your symptoms, build a programme designed for your body and your life, and give you the tools to recover fully — and stay recovered.