What is actually happening

A disc herniation is nucleus pulposus — the disc’s soft inner material — pushing through a tear in the tougher outer ring, the annulus. Two biological things can hurt from there, and they are not the same problem. If the fragment contacts a nerve root, you get radicular pain down a leg or arm, covered in full on sciatica. If the tear itself reaches the outer third of the annulus, which carries its own nerve supply, you can get deep axial back pain with no leg symptoms at all — discogenic pain, generated by the tear rather than by anything touching a nerve. Layer a behavioral driver on top: nicotine constricts the small vessels a disc depends on for nutrition, since the disc itself has almost no blood supply of its own and relies on diffusion. Smokers heal herniations more slowly and develop degenerative disc disease earlier, which is one of the few places where a single habit measurably changes a structural outcome.

The herniation on the scan vs. the disc that hurts

MRI finds disc bulges and even frank herniations in a large proportion of adults who have never had a day of back pain. That is not a flaw in the technology; it means the image alone cannot tell you which disc is the one talking. We read it against your exam — where the pain is, what reproduces it, whether a straight-leg raise or a specific position lights it up — and against the annulus itself. A recent review in Pain Practice makes the case plainly: discogenic pain, driven by annular tears rather than by frank herniation or nerve compression, is common, frequently missed on standard sequences, and explains a share of the “normal-looking” MRIs that get dismissed as unremarkable.

What resorption actually means

Herniated material is recognized by the body as foreign and is gradually broken down and reabsorbed — often best, counterintuitively, in the largest and most inflammatory extrusions, because more exposed material draws a bigger cleanup response. A 2024 meta-analysis in Clinical Spine Surgery pooling outcomes across dozens of cohorts found roughly two in three herniations show measurable shrinkage without surgery. That is the natural history this practice is managing around, not fighting: an epidural steroid injection does not accelerate resorption, but it can make the months it takes survivable.

Roughly two in three herniated fragments shrink measurably without surgery — a population finding, not a promise about any one disc.

The interventional window

An epidural steroid injection is aimed at the inflammatory component — whether that inflammation is coming from a nerve root under chemical assault or from an annular tear generating its own nociceptive signal. It is a treatment for the interval, and this practice does not pre-book a series; each injection is weighed against what the last one achieved. Where the pain is confirmed discogenic without a radicular component, the injection target and the conversation both change, and that distinction is made before treatment, not after a first injection disappoints.

The terrain feeding the disc

A disc heals on the circulation and inflammatory signaling running through the rest of the body. Insulin resistance and systemic inflammation push the disc’s chemical irritation up from an already elevated baseline and stall the resorption an epidural is meant to buy time for. That is the reason a blood panel is drawn at this consultation, and the reason the behavioral half of the protocol, delivered in-house through Acceptance and Commitment Therapy, carries the same weight as the needle. Metabolic health and pain covers the mechanism.

When microdiscectomy enters the plan

For most herniations, surgery is not part of the plan — conservative care, interventional treatment and time resolve the majority of cases, and a fragment given the chance to resorb often makes an operation unnecessary. A 2020 randomized trial in the New England Journal of Medicine comparing surgery to continued conservative care for sciatica lasting four to twelve months found both approaches eventually converged on similar outcomes at one year, which argues for patience where patience is medically safe. What does not argue for patience is a deficit that is new or worsening — a weakening ankle, a foot starting to drop — because compressed nerve function lost over time does not reliably return once it is decompressed later. When conservative and interventional options have been exhausted and the fragment is not resorbing on its own, this practice performs microdiscectomy, and coordinates the timing with any injections already given.

Red flags, in plain terms

Common questions

Related reading

• Sciatica
• Spinal stenosis
• Epidural steroid injection
• Failed back surgery syndrome
• After a car accident