An intervertebral disc has a tough fibrous outer ring and a softer, gel-like center. A herniation is what happens when part of that center pushes through a weakness in the ring and comes to sit where it does not belong — usually a few millimeters from a nerve root.
The pain a herniated disc produces is mostly not about pressure. It is about chemistry and inflammation. Nucleus material is immunologically foreign to the tissue around it, and when it escapes it triggers an inflammatory response that sensitizes the adjacent nerve root. That is why a small herniation can produce ferocious leg pain while a large one can produce almost none, and why anti-inflammatory treatment aimed at the nerve often works before anything has physically moved.
Herniations are most common between the ages of 30 and 55, which surprises people who expect a degenerative problem to be a disease of the very old. A younger disc still has enough water content in its center to be pushed under pressure; a heavily degenerated disc has less to extrude.
Contributing factors that actually matter: repeated bending and lifting under load, particularly with rotation; sustained sitting; smoking, which impairs the already marginal blood supply the disc depends on; and metabolic disease. That last one is routinely left out. Insulin resistance, visceral adiposity and chronic inflammatory load alter disc nutrition and the inflammatory environment around a nerve root, which affects both whether a herniation hurts and how quickly it settles. This practice treats those alongside the structural problem — see lifestyle medicine and medical weight management.
It is also worth knowing that herniation is a common finding in people with no symptoms at all. According to PubMed, a systematic review of imaging in asymptomatic individuals found disc protrusions in 29 percent of 20-year-olds rising to 43 percent of 80-year-olds, and disc bulges in 30 percent rising to 84 percent (Brinjikji W, et al. AJNR Am J Neuroradiol. 2015;36(4):811-6. DOI). A herniation on your scan is a finding. Whether it is your finding is a separate question.
The defining feature is that the leg or the arm hurts more than the back.
Where symptoms are in the arm rather than the leg, the mechanism is the same and the evaluation is the same — our post on cervical radiculopathy covers that presentation specifically.
Rapidly progressive weakness, numbness in the saddle area, or new difficulty controlling bowel or bladder is evaluated urgently rather than scheduled. Call (314) 481-5000 or go to an emergency department.
Examination first, and it settles more than patients expect. Which reflex is diminished, which muscle is weak, which strip of skin has changed sensation, and whether nerve tension maneuvers reproduce the exact pain — these map to a specific nerve root before any imaging is looked at. A well-taken examination produces a hypothesis that the scan is then asked to confirm or refute.
Imaging read against symptoms, not in isolation. MRI shows disc material and its relationship to the nerve. Given how often herniations appear in people with no pain, the report on its own does not make the diagnosis. What makes it is agreement: the level and side of the herniation must explain the level and side of the symptoms. When they disagree — and they disagree often — that disagreement gets resolved before anything is treated rather than papered over. See what each imaging modality can and cannot tell you.
Nerve testing where the picture is mixed. EMG and nerve conduction studies distinguish a compressed nerve root from a peripheral entrapment or a diabetic neuropathy, which is a distinction that changes the treatment entirely.
A diagnostic block where more than one level could be responsible. Where two adjacent levels both look plausible, a selective nerve root block under image guidance anesthetizes one root at a time. If the pain goes while the anesthetic is working, that root is the source. That is a test with an answer, and it is what prevents a procedure aimed at the wrong level.
This is the most useful thing most patients are never told: herniated discs frequently resorb on their own.
According to PubMed, a meta-analysis pooling 11 cohort studies found the overall incidence of spontaneous resorption after conservatively treated lumbar disc herniation to be 66.7 percent (Zhong M, et al. Pain Physician. 2017;20(1):E45-E52. PubMed — no DOI assigned). Roughly two in three shrank or disappeared without an operation.
What that figure does not mean is that you should simply wait. It means the goal of early treatment is to control inflammation and preserve function while the natural history does its work — and that a decision to operate is a decision made against a backdrop where most of these resolve. It also comes with the usual caveat: the pooled studies were observational cohorts, not randomized trials, and the review’s authors said so plainly.
Conservative care. Activity modification without bed rest, targeted physical therapy, and neuropathic pain medication where appropriate. Deconditioning makes this worse rather than better, so the aim is to keep moving within tolerance.
Image-guided injections. Epidural steroid injections and selective nerve root blocks place anti-inflammatory medication where the inflamed root actually is, rather than asking an oral drug to find it. They frequently buy the months in which resorption happens. They are performed under local anesthetic with no sedation — patients are awake, drive themselves home, and resume normal activity, including work, within two to four hours.
Metabolic and inflammatory drivers. Treated here rather than referred out, for the reasons above.
Neuromodulation where pain persists. For patients whose radicular pain outlives the herniation — including after surgery — spinal cord stimulation and peripheral nerve stimulation are options, each tested with a trial before anything is implanted.
This is one of the conditions where surgery has a clear and well-defined role, and this practice performs it. Dr. Gurpreet Singh Padda, MD, MBA, MHP is a licensed physician and surgeon with surgical privileges, and microdiscectomy — removing the fragment that is compressing the nerve — is among the procedures performed here.
It is the right answer when there is a progressive motor deficit, when cauda equina compression is present, or when severe radicular pain that matches the imaging has not responded to a genuine course of conservative and interventional care. It is not the right answer to an MRI report in a patient who is improving, and it is a poor answer to axial back pain without nerve compression, which is a different problem with different causes.
The comparative evidence is worth stating without spin. According to PubMed, the Spine Patient Outcomes Research Trial followed surgical and non-operative candidates with imaging-confirmed lumbar disc herniation across 13 US spine clinics. In the four-year as-treated analysis, patients who had surgery improved more on pain, physical function and disability than those treated non-operatively — while the percentage working was similar in both groups, 84.4 percent against 78.4 percent (Weinstein JN, et al. Spine (Phila Pa 1976). 2008;33(25):2789-800. DOI).
Two things about that trial matter for reading it honestly. Large numbers of patients crossed between arms, which is why the intent-to-treat analysis understated the treatment effect and why the as-treated analysis has to be interpreted with care. And its enrollment criteria selected patients whose imaging and symptoms already agreed — which is precisely the filter that determines whether an operation helps, and precisely the filter that a great many patients have never been put through.
So the sequence: confirm the level, control the inflammation, give the natural history a fair chance, and operate on the patients in whom that sequence has been completed rather than skipped.
Leg or arm pain that follows one line, with a matching change in sensation or strength, is a specific and testable problem. We see patients from across St. Louis, Bridgeton, St. Charles and the Illinois Metro East. Call (314) 481-5000 or request an evaluation.
Frequently, yes. A meta-analysis of 11 cohort studies found spontaneous resorption in about two thirds of conservatively treated lumbar disc herniations. That does not mean doing nothing — it means the job of early treatment is to control the inflammation around the nerve and keep you functioning while the natural history works, and that surgery is a decision made against that background. Read more: Sciatica: disc, piriformis or cluneal nerve?
No. A bulge is a broad, symmetric extension of the disc beyond its normal margin; a herniation is a focal displacement of nucleus material through the fibrous ring. Bulges are extremely common in people with no symptoms — present in 30 percent of 20-year-olds and 84 percent of 80-year-olds in a systematic review of asymptomatic imaging. Neither finding is a diagnosis on its own. Read more: When the scan does not match the pain.
Because the pain is coming from an inflamed and sensitized nerve root, and that root’s job is to carry sensation from your leg. The brain interprets the signal as coming from where the nerve ends, not from where it is being irritated. It is also why the pain follows a line rather than spreading in a patch, and why treating the root rather than the back is what works. Read more: Pain is a signal, not the disease.
No. They are done under local anesthetic with the patient awake and responsive, and most patients drive themselves home and resume normal activity, including work, within two to four hours. The one exception is temporary leg weakness or numbness, which an epidural can occasionally cause and which resolves — if it happens, we wait it out with you rather than sending you off. Read more: How an epidural steroid injection actually works.
There is no magic number and no fixed series. Clinical need decides: how much relief the previous injection gave, how long it lasted, what has changed on examination, and what the plan is building toward. A treatment that is working and a treatment that has stopped working are different situations and get different answers. Read more: Why pain injections stop working.
It is a targeted one. The fragment compressing the nerve is removed through a small approach, leaving the rest of the disc and the spinal alignment intact — it is not a fusion and it does not implant anything. That is a real advantage in terms of what remains possible later. Whether you need one depends on whether your imaging, your examination and your symptoms all point at the same nerve root. Read more: Orthopedic surgeon, neurosurgeon or pain physician?
Because removing the compression is not the same as reversing what the compression did. A nerve root that has been inflamed and sensitized for months can keep generating pain after the mechanical problem is gone, and scar tissue around the root is its own separate process. Both are treatable, and neither means the operation failed. Read more: Why leg pain persists after back surgery.
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