Medically reviewed by Scott A. Meyer, MD, FAANS · Last reviewed: Sept 29, 2026
An MRI showing a herniated disc is alarming to read, especially when the report uses words like “extrusion” or “nerve root compression.” But the image is only half the story, and for most people it is not the half that decides whether they need surgery.
Here is the short answer. Most herniated discs improve without an operation, and the body often reabsorbs the herniated tissue on its own. Surgery becomes the right choice in three situations: when leg pain persists despite several weeks of good non-surgical care, when there is progressive weakness, or when there are warning signs of severe nerve compression, which is an emergency.
Key takeaways
- Across studies of patients treated without surgery, about two-thirds of herniated discs shrank on their own.[1]
- The larger herniations are the ones most likely to resorb, not the smaller ones.[2][3]
- Surgery is generally considered after about six weeks of non-surgical care when symptoms match the MRI findings.[4]
- Waiting a very long time matters. Outcomes tend to be better when surgery follows soon after conservative care has clearly failed.[5]
- Sudden bladder or bowel changes, numbness in the groin, or rapidly worsening weakness need emergency assessment, not an appointment next week.
What is actually happening
Each disc has a tough outer ring and a softer center. When the outer ring tears, some of that softer material can press on a nerve root as it leaves the spine. The pain you feel in your leg comes from the irritated nerve, not from the disc itself, which is why sciatica often hurts far more than your back does.
Radiology reports grade how far the material has moved: a bulge, a protrusion, an extrusion, or a sequestration where a fragment separates completely. Those words sound progressively worse, and in one way they are. But they also predict something counterintuitive.
The part most patients are never told
Herniated discs often shrink by themselves. A meta-analysis of patients treated without surgery found spontaneous resorption in about 67% of cases.[1]
Even more surprising, the worst-looking herniations are the most likely to disappear. A systematic review found spontaneous regression rates of 96% for sequestration, 70% for extrusion, 41% for protrusion and 13% for bulging discs.[2] A 2023 meta-analysis reported a similar pattern: 93% for sequestered, 70.4% for extruded, 52.5% for protruded and 13.3% for bulging discs.[3]
The likely reason is that when disc material breaks through completely, the body treats it as foreign tissue and clears it. This is why an alarming MRI report does not automatically mean an operation, and why a surgeon who recommends surgery based on imaging alone, without matching it to your symptoms and examination, is worth questioning.
“I tell people the MRI is a photograph, not a verdict. I have seen large herniations shrink away over a few months while the patient got better on their own. What I am actually looking at is whether the nerve the MRI says is compressed is the same nerve causing your symptoms on examination. If those two don’t agree, operating on the picture will not fix the pain.”
— Scott A. Meyer, MD, FAANS, Neurosurgeon, Maxim Spine
When surgery is the right call
1. Symptoms that don’t settle after about six weeks
Published indications for lumbar disc surgery are consistent: imaging that confirms a herniation, clinical findings that match it, and failure to improve after roughly six weeks of conservative care.[4]
“Conservative care” should mean real treatment: physical therapy, medication, activity modification, and in some cases an epidural steroid injection. Six weeks of simply waiting and hoping is not the same thing.
2. Progressive weakness
Pain is miserable but not dangerous. Weakness is different. A foot that drags, a leg that gives way on stairs, or a grip that is losing strength suggests the nerve is not just irritated but failing. That usually moves surgery up the list.
3. Emergency signs
Loss of bladder or bowel control, numbness around the groin and inner thighs, or weakness in both legs can indicate severe compression of the nerve bundle at the base of the spine. This is a surgical emergency. Go to an emergency room; do not wait for an office appointment.
What the research says about surgery versus waiting
The largest trial on this question, SPORT, randomized patients with confirmed herniation and at least six weeks of symptoms. Both groups improved substantially over two years, and the differences between them favored surgery but were small and not statistically significant in the primary analysis.[6] Many patients crossed over between groups, which makes the trial harder to interpret than it looks.
A useful way to read it: for most people, surgery buys faster relief rather than a better final destination. If your pain is tolerable and slowly improving, waiting is reasonable. If it is wrecking your sleep, your work and your life, that speed matters.
Timing is not unlimited, though. A systematic review of 20 studies covering more than 3,600 patients found that delayed surgery was linked to prolonged symptoms and poorer outcomes, particularly in severe cases, and that patients who moved to surgery within six weeks of conservative care failing did better than those who waited longer.[5] For cervical disc herniation, one study found better arm pain scores when decompression happened within six months of symptom onset.[4]
What the operation involves
The usual operation for a lumbar herniated disc is a microdiscectomy: through a small incision, the surgeon removes the fragment pressing on the nerve, leaving the rest of the disc in place. Maxim Spine’s surgeons perform this with minimally invasive techniques, and also perform endoscopic discectomy, both described on our lumbar spine procedures page.
Most patients go home the same day. Leg pain often improves immediately, since the pressure on the nerve is relieved during surgery, while numbness and weakness recover more slowly, sometimes over months. Fusion is not usually needed for a straightforward herniated disc.
If you want to know what to do in the weeks before an operation, our guide on preparing for spine surgery covers the things that genuinely affect the outcome.
“Weakness moves things along faster than pain does. If a foot is getting weaker, I am not inclined to wait and watch. The other situation is a patient who has done everything right for six weeks, is no better, and cannot work or sleep. At that point waiting longer does not usually improve the result, and we know outcomes are better when we act then rather than months later.”
— Scott A. Meyer, MD, FAANS, Neurosurgeon, Maxim Spine
Questions to ask at your consultation
- Does my MRI match my symptoms and my examination?
- Is my herniation a protrusion, an extrusion or a sequestration?
- What are the chances this settles without surgery?
- What would you do if we waited another six weeks?
- Would an injection help, and would it delay surgery if I needed it anyway?
- If I have surgery, is it a microdiscectomy or something larger?
- What’s the chance of a recurrence at the same level?
Getting evaluated in New Jersey
Our surgeons see herniated disc patients at four New Jersey offices, and our Morristown office is a short distance from Morristown Medical Center, where surgery is performed when it is needed.
- Morristown: 310 Madison Avenue, Suite 300, Morristown, NJ 07960
- Cedar Knolls: 197 Ridgedale Avenue, Suite 225, Cedar Knolls, NJ 07927
- Bridgewater: 745 US-202, Suite 205, Bridgewater, NJ 08807
- Verona: 799 Bloomfield Avenue, Suite 112, Verona, NJ 07044
Offices are open Monday through Friday, 9 a.m. to 5 p.m. See directions and contact details, or read about our surgeons.
Bring your MRI images and report, not just the report, along with a list of what you have already tried and how long each lasted.
Frequently asked questions
Can a herniated disc heal without surgery?
Often, yes. Around two-thirds of herniated discs shrink on their own in patients treated without surgery, and larger herniations are more likely to resorb than smaller ones.[1][2][3]
How long should I wait before considering surgery?
About six weeks of genuine non-surgical treatment is the usual threshold, provided there is no weakness or emergency sign.[4] Waiting much longer after that care has clearly failed is associated with poorer outcomes.[5]
Does a bigger herniation mean I need surgery?
Not by itself. Sequestered and extruded discs, the dramatic-looking ones, have the highest rates of spontaneous regression.[2][3] What matters is how your symptoms and examination line up with the imaging.
Will surgery give me a better result than waiting?
In the SPORT trial both groups improved over two years, with differences that favored surgery but were small in the primary analysis.[6] Surgery usually means faster relief rather than a different endpoint, which matters more for some lives than others.
What are the emergency symptoms?
New loss of bladder or bowel control, numbness in the groin or inner thighs, or weakness in both legs. These need emergency evaluation the same day.
Can the disc herniate again after surgery?
Yes, recurrence is possible at the same level. Ask your surgeon for their rate and what they advise to lower the risk.
Next steps
If leg pain, numbness or weakness has lasted more than a few weeks, or if an MRI has found a herniation and you want a clear explanation of what it does and doesn’t mean, an evaluation can sort out whether waiting or treating is the better path. Request an appointment at any of our four New Jersey offices.
Medically reviewed by: Scott A. Meyer, MD, FAANS
Specialty: Spine surgery · Board certified in neurological surgery
About the reviewer: Dr. Meyer is a board-certified neurosurgeon and the founder of Maxim Spine. After graduating from Brown University Medical School, he completed his residency at Mount Sinai Medical Center in New York City and a spine fellowship at the University of California, San Francisco. He has served as Scientific Program Chair and Annual Meeting Chair for the Spine Summit, the annual spine meeting of the American Association of Neurological Surgeons and Congress of Neurological Surgeons.
This article is for general education and is not a substitute for medical advice. Leg pain and numbness have many causes, and only a clinician who has examined you and reviewed your imaging can advise on treatment.
References
- Zhong M, Liu JT, Jiang H, et al. Incidence of spontaneous resorption of lumbar disc herniation: a meta-analysis. Pain Physician. 2017;20(1):E45–E52. https://pubmed.ncbi.nlm.nih.gov/28072796/
- Chiu CC, Chuang TY, Chang KH, et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clin Rehabil. 2015;29(2):184–195. https://pubmed.ncbi.nlm.nih.gov/25009200/
- Systematic review and meta-analysis of predictive factors for spontaneous regression in lumbar disc herniation. J Neurosurg Spine. 2023;39(4):471–478. doi:10.3171/2023.6.SPINE23367. https://pubmed.ncbi.nlm.nih.gov/37486886/
- Herniated discs: when is surgery necessary? EFORT Open Reviews. 2021;6(6):526–530. https://pmc.ncbi.nlm.nih.gov/articles/PMC8246101
- Indications for surgery versus conservative treatment in the management of lumbar disc herniations: a systematic review. 2025. https://www.sciencedirect.com/science/article/pii/S2772529425014389
- Weinstein JN, Tosteson TD, Lurie JD, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (SPORT): a randomized trial. JAMA. 2006;296(20):2441–2450. https://pmc.ncbi.nlm.nih.gov/articles/PMC2553805
