Herniated Disc: Symptoms, Treatment & Surgery

A herniated disc is a displacement of the soft inner core of an intervertebral disc (the nucleus pulposus) through a tear in its outer ring (the annulus fibrosus), where it can press on nearby nerve roots and cause pain, numbness or weakness ¹. It is the most common cause of sciatica, and one of the most over-feared diagnoses in musculoskeletal medicine. The reassuring headline, grounded in robust evidence: the vast majority of lumbar disc herniations improve significantly with conservative care — no surgery required ²³. More striking still, a landmark systematic review published in the American Journal of Neuroradiology found that disc herniations, bulges and other degenerative findings are common on MRI scans of people with absolutely no pain ⁴. A scan finding is not the same as a diagnosis.

What is a herniated disc — and how does it happen?

The intervertebral disc sits between each pair of vertebrae and acts as a shock absorber and spacer. It has two components: a tough outer ring of collagen fibres (annulus fibrosus) and a gel-like inner core (nucleus pulposus) rich in water and proteoglycans that absorb compressive loads ¹. With age, repetitive loading, genetic predisposition or an acute strain, the annulus develops fissures. If these deepen enough, nucleus material can bulge or extrude beyond the disc’s normal boundary — and if it does so in the direction of the spinal canal, it may press on a nerve root ¹.

Herniations are classified by shape and severity. A protrusion is the mildest form — the disc base is wider than the extent of protrusion. An extrusion is more pronounced — the extruded material extends further than its base, with a narrower neck connecting it to the parent disc. Sequestration is the most severe: a fragment separates entirely and migrates within the spinal canal. Counterintuitively, extrusions and sequestrations are actually the most likely to resorb spontaneously ².

Around 95% of lumbar disc herniations occur at the L4–L5 or L5–S1 levels ¹. An L4–L5 herniation typically compresses the L5 nerve root, producing pain or weakness in the shin and the top of the foot, sometimes with toe extension weakness. An L5–S1 herniation usually affects the S1 root, causing pain along the outer calf and sole of the foot, with a reduced ankle reflex. These patterns help a clinician localise the level without needing a scan.

What are the symptoms of a herniated disc?

Symptoms range enormously — from no symptoms at all (see below) to debilitating leg pain. The most characteristic presentation is radiculopathy: pain, tingling or numbness that radiates from the lower back down one leg following the path of the compressed nerve root (commonly described as sciatica). The radiation pattern, and the muscles or reflexes affected, depend on which level is involved ¹.

Low back pain, often dull and aching, aggravated by sitting or bending forwards
Shooting, burning or electric pain down one leg (sciatica) — most commonly below the knee
Pins and needles or numbness in the leg, foot or toes
Weakness in foot dorsiflexion (lifting the foot) — L4–L5 level
Weakness in plantarflexion or toe walking — L5–S1 level
Reduced or absent ankle jerk reflex — S1 root involvement
Pain worsened by coughing, sneezing or straining (increased disc pressure)

The myth-busting finding: a herniated disc on MRI does not always mean you are the problem

This is one of the most important facts in modern spine medicine, and one of the most consistently misunderstood. In 2015, Brinjikji and colleagues published a systematic review of imaging studies in asymptomatic individuals — people with no back pain — and found that disc degeneration, bulges and herniations are extremely common findings in pain-free adults, increasing steadily with age ⁴. By age 50, disc degeneration is present in roughly 80% of asymptomatic people; disc bulges in around 60%; disc protrusions in approximately 30%. These findings are part of normal ageing, not evidence of damage.

This is why NICE guideline NG59 — the UK’s leading evidence-based guideline for low back pain — explicitly states: do not routinely offer imaging for people with low back pain with or without sciatica ⁵. A scan rarely changes initial management for uncomplicated presentations, and it can create anxiety about findings that would never have caused symptoms.

Does a herniated disc heal on its own?

For most people, yes. A 2015 systematic review by Chiu and colleagues — one of the most cited analyses on this question — pooled data across studies and found that spontaneous regression (the herniation shrinking or disappearing without surgery) occurred in 96% of disc sequestrations, 70% of extrusions, 41% of protrusions and 13% of bulges ². The body can resorb extruded disc material through a process driven by inflammatory cells and blood vessels that gradually break it down.

The natural history of sciatica caused by a disc herniation is similarly encouraging. A Cochrane-referenced systematic review found that early surgery produced faster pain relief but that after one to two years the outcomes of surgery and conservative care converged — both groups improved substantially ³. For most patients, time, staying active and appropriate conservative treatment produce the same result as surgery, just more gradually.

Conservative treatment: what works?

Conservative management is the recommended first approach for the overwhelming majority of disc herniations ¹⁵. It typically includes staying as active as tolerable (bed rest is not recommended and may slow recovery), targeted exercise to maintain movement and reduce nerve sensitisation, and manual therapy where appropriate.

NICE NG59 recommends considering manual therapy — including spinal manipulation, mobilisation and soft-tissue techniques — as part of a treatment package that also includes exercise ⁵. The American College of Physicians similarly endorses spinal manipulation as a first-line non-pharmacological option for both acute and chronic low back pain. Evidence from clinical trials confirms that this approach reduces pain and improves function for most people with lumbar radiculopathy caused by disc herniation, even where the disc has not structurally changed.

What can osteopathy do — and what can it not do?

This is worth being precise about. Osteopathic treatment cannot physically push a herniated disc back in place — no manual therapy can reliably do this, and any claim to the contrary is not supported by evidence ⁶. What osteopathy can do is address the wider mechanical picture that surrounds the herniation: the muscle spasm and guarding that develops around a painful nerve root, the compensatory stiffness in adjacent joints that loads the affected level further, the reduced movement that slows recovery, and the fear of movement that makes the cycle worse.

A review of osteopathic care for spinal complaints (Cerrato et al., PMC 2018) found that osteopathic manipulative treatment (OMT) is supported as a non-invasive first-line approach to achieving relief from sciatica ⁶. The probable mechanisms are reduction of peripheral sensitisation, improvement in local circulation, release of protective muscle guarding, and restoration of movement at joints above and below the herniated level — all of which reduce the load on the compromised disc and nerve root.

OMT is most appropriate for disc herniations that are in the sub-acute or chronic phase, or for acute presentations where there is significant mechanical overlay. It is not appropriate — and would be referred on immediately — in any case showing neurological deterioration, progressive weakness or signs of cauda equina syndrome (see below).

Exercise and movement: why they matter more than rest

The clearest evidence-based recommendation in disc herniation management is to keep moving. Prolonged bed rest worsens outcomes; activity promotes disc nutrition (discs have no blood supply and rely on movement to draw in nutrients) and prevents the secondary deconditioning that makes recovery harder ⁵. The precise form of exercise matters less than doing it consistently. Aerobic activity, specific spinal stabilisation exercises, nerve mobilisation ("nerve gliding") and graduated loading under supervision all have a role depending on stage and severity.

Red flags: when to seek urgent care

The vast majority of disc herniations are not emergencies. But a small subset involve compression of the cauda equina — the bundle of nerve roots at the base of the spinal cord — which constitutes a surgical emergency. Go directly to an emergency department if you develop any of the following ⁷:

Other situations requiring prompt (non-emergency) medical review — not osteopathy — include disc herniation with progressive neurological deficit (increasing weakness, not just pain), fever with back pain (possible infection), back pain after significant trauma, or a history of cancer. When in doubt, seek medical advice first.

When is surgery for a herniated disc indicated?

Surgery is appropriate in a defined minority of cases. NICE NG59 recommends considering spinal decompression when non-surgical treatment has not improved pain or function after an adequate trial, and where radiological findings are consistent with the symptoms ⁵. The clearest indications are: cauda equina syndrome (immediate surgery); progressive neurological deficit — worsening motor weakness that is not responding to conservative care; and persistent, disabling sciatica after 6–12 weeks of optimised conservative treatment ¹⁵⁷.

Surgery produces faster short-term pain relief in carefully selected patients, but multiple randomised trials confirm that 1–2 year outcomes are similar to well-managed conservative care in most cases ³. Surgery carries its own risks — infection, nerve damage, adjacent segment loading, re-herniation — and is not a guaranteed cure. The decision should always be shared, informed and specific to each patient’s functional goals and timeline.

Recovery timeline: what to expect

For most acute disc herniations with sciatica, the natural history is improvement over 6–12 weeks ¹³. Many patients notice meaningful reduction in leg pain within 4–6 weeks with conservative management. Larger herniations and extrusions can take longer but — counterintuitively — are the most likely to regress spontaneously ². Recurrence is possible; regular exercise, avoiding prolonged sitting and maintaining a healthy body weight reduce the risk.

Assessment and treatment in Olbia

If you have been told you have a disc herniation — or if you have low back and leg pain that you think might be disc-related — the most useful first step is an accurate clinical assessment. Marco will examine how you move, assess the nerve root picture, screen for red flags and tell you honestly whether osteopathy is appropriate for your presentation, or whether another pathway (GP referral, specialist opinion, imaging) would serve you better. There is no pressure and no assumption that every back problem needs ongoing treatment.

Home visits are available across the greater Olbia area — including Golfo Aranci, Porto Rotondo, San Teodoro and the Costa Smeralda — from €125. Studio appointments start from €90 for a first assessment. Book by phone or WhatsApp.

Herniated disc: symptoms, treatment and when surgery is really needed