Do I need surgery for a herniated disc, or will physio do?

Do I need surgery for a herniated disc?

Do I need surgery for a herniated disc is where most readers start, and for most of them the answer is no. The NHS says surgery is not usually needed for a slipped disc. Australia's healthdirect says much the same from the other direction: the pain usually gets better by itself, without scans or an operation. Its own page on the operation, lumbar microdiscectomy, tells readers that for many people the symptoms improve without one.

Both of the wrong answers here cost something, which is why this page argues for neither. Talked out of an operation you needed, you can be left with a leg that never quite comes back. Talked into one you did not need, you can end up where you would have ended up anyway, having had an operation to get there.

What follows is what moves the decision and what the trials measured, and it ends with the questions to take into the appointment. Whether you need an operation is settled by an examination, your scan and how your symptoms have behaved, in front of a spine specialist. Nothing written here can stand in for that.

One part of this is not a decision at all. The emergency signs below, including numbness around your genitals or bottom and new bladder or bowel trouble, need help straight away. They are not an option to weigh against anything else on this page.

Who this page is about is worth settling first. The criteria below, and every figure on the page, come from guidelines and trials in adults, and the NICE guideline the page leans on is written for people over 16. A disc herniation in someone still growing is uncommon, and it does not behave the same way. Non-surgical treatment is still what gets tried first, although it works less well than it does in adults, and the characteristic finding on the scan can be a broken piece of the bony growth rim at the back of the vertebra rather than disc material (Zhang and colleagues, 2025). So back and leg pain in a child or a teenager goes to a doctor who can examine them, and nothing on this page settles it.

If you are pregnant or have recently given birth, the decision needs the team looking after your pregnancy as well as a spine specialist, and new back pain in pregnancy has causes of its own that have nothing to do with a disc. Contact your midwife or maternity unit straight away about new back pain in the second or third trimester, and about back pain with a fever, bleeding from your vagina or pain when you pee, or pain in one or both sides, under your ribs. That comes first, whatever your scan report says.

If you want the exercise side rather than the surgical one, the lumbar disc herniation program has the staged version, sciatica covers the leg pain itself, and can a herniated disc heal on its own has what repeat scans and the recovery studies found.

What actually decides it

Three findings do most of the work in the published criteria, and neither how big the herniation looked nor the wording on your scan report is one of them. How bad the nerve symptoms are does count in one of the three sources below, and that is a different thing from how long you have been putting up with them.

1. Weakness or numbness that is getting worse, or nerve symptoms that are severe. Weakness is the one that changes the clock as well as the answer, and it is dealt with in the next section rather than here.
2. Symptoms that have not improved after proper non-surgical care. Note the word improved. The test is not whether you still have symptoms, but whether they are moving. This criterion is also not for everyone: AO Spine's 2026 recommendations say a continued trial of non-surgical care is not appropriate for someone with a major weakness in the leg, with cauda equina syndrome, or with instability on imaging, who should be referred for prompt surgical assessment instead.
3. A scan finding that matches the symptoms you actually have. A herniation on the left at one level does not explain pain down the right leg, and plenty of findings on a report explain nothing at all.

Those are the guidelines' criteria rather than ours. NICE suggests considering an operation to take pressure off the nerve (spinal decompression) when non-surgical treatment has not improved pain or function and a scan shows a cause that matches the symptoms. The NHS names two reasons for a GP in the UK to refer you to a specialist to discuss surgery: symptoms that have not improved with other treatments, and symptoms that include worsening muscle weakness or numbness. healthdirect, in Australia, puts it as severe nerve symptoms, or not getting better with other treatment.

The three national sources overlap on one point and part company on another. All three count a failure to improve. Severity is healthdirect's alone: the NHS names none, and the NICE condition is a failure to improve together with a matching scan. And healthdirect counts nerve pain among nerve symptoms on that same page, rather than only numbness and weakness, so leg pain that genuinely is not letting up sits inside its wording. What none of the three says is that bad pain on its own is an indication, with nothing on the scan that explains it and a non-surgical route nobody has seen through.

Who refers you, how long you wait and who you see differ between countries, and this page cannot tell you how it runs where you live. The criteria above travel; the pathway does not. The conversation belongs with a spine specialist wherever you live, and a scan report read on its own is not a referral.

The emergency signs are deliberately absent from that list. They are not criteria for weighing an operation against physiotherapy, and putting them on the list would make them look like one.

When is it an emergency rather than a decision?

Some symptoms mean the decision has already been taken out of your hands, and the only question left is how fast you get seen.

Numbness around your genitals or bottom, new trouble with your bladder or bowels, pain, tingling, numbness or weakness in both legs, or loss of feeling in one leg means calling emergency services or going to an emergency department straight away, and not driving yourself there. This is pressure on the bundle of nerves at the base of the spine, cauda equina syndrome, and healthdirect's disc page calls it an emergency in those words. Nothing further down this page applies to it. It is not an option to compare with exercise, it is not something to raise at your next appointment, and the trials below have nothing to say about it.

Weakness is the other one that does not wait for a clinic letter. A leg or foot that is getting weaker, for example your foot drags, catches on the ground or slaps down when you walk (foot drop). Get medical advice the same day. If the weakness is getting worse by the hour, go to an emergency department. A motor problem that is still progressing is a red flag in the international framework for serious spinal pathology (Finucane and colleagues, 2020), and it is the reason the NHS names worsening weakness as a referral trigger in its own right rather than lumping it in with pain.

A weakness that has stopped getting worse is not the same thing as one that has recovered, and it is not a reason to sit and wait. A leg that is clearly weak, or numb enough to change how you walk, is a severe nerve symptom in healthdirect's sense, so it belongs with the first of the criteria above and in front of someone who can examine it rather than on a list of things to mention eventually.

Clearly weak means something you can check on yourself: you cannot lift your foot clear of the ground, you cannot push off properly, or your knee gives way. If you cannot tell whether yours counts, treat it as though it does. Get medical advice the same day about a leg or foot that is clearly weak, whether or not the weakness is still getting worse, and go to an emergency department if nobody can assess you today.

How you get there matters too, since the leg in question is the one that works the pedals. Do not drive yourself: a leg or foot weak enough to match that description cannot be relied on at a brake, and numbness and weakness are the parts of a nerve problem that do not hurt, so ask someone else to drive you, or take a taxi. Losing feeling in the leg is a different line again, and a more urgent one: that is among the emergency signs at the foot of this page, and it means emergency help now rather than an appointment today.

There is a surgical reason for that same-day line, and it is the only timing on this page that is counted in days. AO Spine, an international spine surgery organization, published clinical practice recommendations in 2026 on when to operate for a disc herniation. A panel wrote them from its reading of six key studies. Where the herniation has caused a moderate to severe weakness in the leg, it conditionally recommends taking the pressure off the nerve within three days of the weakness starting, to give the best chance of strength coming back completely, and within eight days where the weakness is mild but is getting in your way. It also says a disc herniation with a moderate to severe weakness should be managed on an emergency basis, in the same way as cauda equina syndrome (AO Spine Knowledge Forum Degenerative, 2026).

Underneath that sit two studies of people who had a microdiscectomy for a disc herniation with weakness in the leg, both from one hospital and both observational rather than randomized. In the larger, 390 people followed for at least a year, three days came out of the data as the point where recovery changed, and as the AO Spine review reports its figures, 90.5% of those operated on within three days ended with full strength against 36% of those operated on later (Thomé and colleagues, 2022). In the other, 330 people, a moderate or severe weakness recovered faster when the operation happened inside 48 hours (Petr and colleagues, 2019). Neither design can prove the timing caused the difference, and the guideline grades its own recommendation as conditional.

Those three days are not what they sound like. They are a deadline for the whole chain, being examined, scanned, seen by a specialist and operated on, counted from when your leg went weak rather than from when you ring, which is why a clearly weak leg is a today problem rather than a next-week one. The guideline's authors make the same point from the other end, that the delays usually happen before a surgeon is involved, so say plainly that your leg is weak and when the weakness started, rather than describing the pain. And if your weakness is already weeks or months old, this is not a door that has shut on you. What the evidence says is that a complete return of strength becomes less likely, not that an operation stops being worth discussing, and the question is still one for a spine specialist who can examine you.

Whichever side of those numbers you are on, what you do today is the same. Say the leg is weak, say when the weakness started, and get it examined today. The numbers are there to tell you how fast this moves, not to tell you that you are too late.

A leg can also feel weak because pain is switching the muscle off rather than because the nerve is damaged, and telling those two apart is one of the things an examination does and you cannot do at home. That is a reason to be examined, not a reason to decide for yourself that it is only the pain.

If you are not sure whether what you are feeling has crossed a line, when sciatica needs urgent care goes through each sign in turn and sorts them by how fast to act.

What did the trials find about waiting?

The best known trial found that early surgery bought time rather than a better destination, and the honest version of it has two halves.

That trial recruited adults in the Netherlands whose severe sciatica from a disc herniation had already lasted 6 to 12 weeks, and allocated half of them to early surgery and half to prolonged non-surgical care with an operation later if it was needed. In the two year report, leg pain settled faster in the early surgery group, but that difference was no longer significant by six months, and across the two years there was no significant overall difference in disability between the groups.

There is a line in the same report that belongs next to that, because a page that leaves it out is quietly arguing. Across the whole two years of leg pain rather than single time points, the trial still found a difference in favor of early surgery, at the edge of statistical significance. The faster relief was real; what it did not buy was a better position two years on. Two more figures from the same report usually get handed out separately: 44% of the prolonged non-surgical group, 62 people of 142, had an operation within those two years, and 20% of everyone in the trial, whichever arm they were in, still reported an unsatisfactory outcome at that point (Peul and colleagues, 2008).

Read those numbers against who was in the trial before you take them anywhere. Everyone had severe leg pain that had already run for six to twelve weeks when they were recruited, so this is a group that was struggling by the time anybody counted, and it is not a description of someone three days into a sore back. The one year report of the same trial is quoted more often and gives a lower crossover figure for the same people, because it was measured a year earlier. Both are correct for their own follow-up, and can a herniated disc heal on its own sets out each with its date attached.

Another finding bears on the decision, and it rarely appears on pages written for patients. An analysis of the SPORT studies, which enrolled people in the United States who had a disc herniation with leg symptoms and were candidates for surgery, compared those whose symptoms had lasted six months or less with those whose symptoms had run longer, and followed them for up to four years. The longer group did worse on pain, physical function and disability at every follow-up, with surgery and without it. The half that matters when you are choosing is the other one: the extra benefit of surgery over non-surgical care did not depend on how long the symptoms had lasted (Rihn and colleagues, 2011). So a long history is a reason to get assessed and get moving, and it is not in itself an argument that you have now missed the window for one route or earned the other.

That analysis grouped people by the treatment they actually received rather than by random allocation, so it describes an association and not a cause. Its group sizes and its other findings are on the page about whether a disc heals, linked above.

One trial speaks directly to the reader who has already waited months, and it is the piece of trial evidence on this page that comes out most clearly in favor of operating. A single centre trial in Canada took 128 adults whose sciatica from a herniation at one of the lowest two levels of the lower back had already lasted 4 to 12 months, and assigned them at random either to a microdiscectomy or to six months of standardized non-surgical care with surgery afterward if it was needed. The operated group did better on the measure the trial was built around. Leg pain at six months averaged 2.8 out of 10 against 5.2, a difference of 2.4 points. Nine of the people who had the operation had an adverse event associated with it, and one needed a second operation for a recurrence. A third of the non-surgical group, 22 of 64, had the operation anyway, at a median of 11 months (Bailey and colleagues, 2020).

The limits matter as much as the result. It was one centre, 128 people out of 790 screened, the non-surgical care it compared against was a defined program rather than whatever you happen to have had, and nobody could be blinded to which treatment they were getting, which matters when the main measure is how much pain somebody reports. What it does establish is that a long history is not on its own a reason to carry on waiting, which is the direction the SPORT analysis above points in from different evidence. Neither of them says an operation is the right answer for you.

Does the six month rule mean I have to decide by then?

No, and the sentence this idea comes from says something narrower than it is usually made to say.

The North American Spine Society guideline suggests that where symptoms are severe enough to need surgery, removing the piece of disc relieves them better than non-surgical care, and that in that group the operation happens before symptoms have lasted six months (Kreiner and colleagues, 2014). Look at who the sentence is about: people for whom an operation is already indicated. It describes the timing of an operation somebody is having, not a date by which you have to choose one. Nothing becomes an indication at 26 weeks that was not one at 25. What does run on a clock is a weakness in the leg, whether it is still getting worse or has settled at being clearly weak, and that sits in the emergency and same-day section above rather than in any six month rule.

That guideline is also older than it looks on a search results page, because its literature search ran to July 2011. Its own authors were careful about what sat underneath this part of it: where they had no reliable evidence they published expert consensus and said plainly that it was consensus.

What the operation is, and what it does not fix

For a disc, the operation takes away the piece of disc that is pressing on the nerve root. The names you will hear for it are discectomy and microdiscectomy. NICE describes the purpose in one phrase worth holding on to through the whole conversation: to take pressure off the nerve.

It is worth being exact about what that leaves behind, because nobody describes this part. The surgeon takes out the fragment that is pressing on the root, and the rest of that disc stays where it is. The opening in the back of the disc wall that the fragment came out through is not sewn back into disc: it heals by scar. So the pressure comes off the nerve, which is why leg pain often settles quickly, while the disc itself is not restored to how it was, and that opening is where a reherniation comes from, meaning a fragment coming back out of the same disc.

The criteria read differently in that light. Every one of them, in the NHS, NICE and healthdirect wording above, is about the nerve: weakness, numbness, nerve symptoms that are severe, a scan finding that explains them. Nothing in the operation restores the disc to how it was, and nothing in those criteria is about a sore back on its own account. If your main complaint is back pain rather than leg pain, you are not the reader those criteria were written about, and the question to ask in the appointment is a direct one: what do you expect this to change about my back pain, as opposed to my leg pain.

The symptoms the operation is aimed at also recover on different timetables, which is worth knowing before you choose between the routes. Taking the pressure off a nerve root usually does most for leg pain, and does it soonest. Numbness and weakness are the nerve itself rather than the pressure on it, so they come back more slowly, sometimes not completely, and a weakness that has been dense for a while is the least predictable of the three, for the reasons in the timing evidence further up this page. Someone deciding mainly to get a weak leg working again is asking a different question from someone deciding to get rid of leg pain, and it is worth saying out loud in the appointment which of the two you are.

No operation is free of risk, and the honest position on figures is in the risks question below. For the wider family of operations that take pressure off a nerve in the lower back, the NHS says serious complications are uncommon and may include a leak of spinal fluid that can mean more surgery is needed, damage to spinal nerves or paralysis, back pain that does not get better, and other bones in the spine moving out of place afterward, which can mean another operation. It prints no numbers against that list, and neither do we.

Two more questions belong in the same conversation. One is the chance of the disc herniating again. There is no website figure for it, and the reason is more useful than being told to ask: what predicts it best is how much of the back wall of the disc is missing when the operation finishes, which the surgeon sees and you cannot. A meta-analysis pooled seven comparative studies of 1,653 people who had a lumbar discectomy, followed for a median of just under three years. In the people left with a large opening rather than a small one, the odds of symptoms coming back were about two and a half times higher, and the odds of a second operation about twice as high (Miller and colleagues, 2018).

In one surgeon's prospective series of 187 first single level operations, assessed by an independent examiner at a median of six years, a fragment through a small fissure gave a 1% reherniation rate and a 1% reoperation rate, while extruded fragments with a large area of the back wall gone gave 27% and 21% (Carragee and colleagues, 2003). The authors concluded that what they found during the operation predicted the outcome more clearly than anything measurable beforehand. That series is one surgeon in one centre reported in 2003, so its exact percentages are not yours. The point of it here is the spread rather than any single number: the only person who can give you a figure is the one who operated, and your scan cannot tell either of you in advance which group you will be in.

The other question is recovery. This page prints no post-operative dates on purpose: the readable national information is written for the broader family of operations that take pressure off a nerve in the lower back, not for a discectomy by itself, and your own team's instructions are what govern your weeks. Returning to the gym with a herniated disc sets out what those national sources do and do not say, with their limits, and covers training after a discectomy.

What the non-surgical route actually involves

The second of the three criteria above turns on whether non-surgical care has worked, which makes it worth knowing what you have actually had. Plenty of people reach a surgical opinion having had a leaflet, a prescription and six weeks of hoping.

In NICE's terms the package is advice to carry on with your normal activities, exercise, and a group exercise program for a flare-up. The North American guideline is blunter about the evidence under it: for a disc herniation with leg pain it found the evidence insufficient to recommend either for or against physiotherapy or structured exercise on their own, while its expert consensus supported a limited course of structured exercise for mild to moderate symptoms (Kreiner and colleagues, 2014). NICE also names an option readers rarely hear about until late, an epidural injection of local anesthetic and steroid, which it suggests considering for acute and severe sciatica. Ask whether that has been discussed, and what it would be for, before anyone concludes that the non-surgical route has run out. That is about the second criterion, whether treatment has worked, and it is not a reason to try one more thing while a weakness in the leg is getting worse.

Judging whether it is working is where most people go wrong, because they watch the wrong signal. This way of reading your leg was written for a disc that has not been operated on. If you have had surgery on your back, your surgical team's plan comes first, because a nerve the surgeon has freed can go quiet while the disc wall it came through is still healing, and a quiet leg cannot clear a restriction your team has set. If pain, numbness or tingling spreads further down your leg during or after an exercise, stop that exercise and leave it out for now. If the leg symptoms ease or pull back toward your buttock, physios usually count that as a good response, even if your back aches a little more for a while.

That pattern has been studied as a sign of how someone is likely to do (May and Aina, 2012), and it is a far better read on progress than a second scan. The staged version is on the lumbar disc herniation program and what to change meanwhile is on herniated disc exercises to avoid.

What does herniated disc surgery cost?

This is among the most searched questions about the operation and one of the few on this page we cannot answer. We do not publish prices, and we have not verified how each country funds this operation, so we are not going to guess at it.

The cost to you is decided by how care is funded where you live, not by the operation itself. A price you find online belongs to the system it was written in, often a private one in a single country, and it will not tell you what this costs you. Health systems in the UK, Canada, Australia, New Zealand and the United States pay for care in different ways, so a figure that crosses between them is just a number.

Four questions get you a real answer faster than any search. Is this operation funded for me where I live, and on what conditions. What will it cost me, including anything an insurer does not cover. How long is the wait, and does it differ between a public and a private route.

The fourth is whether a second opinion is available to you, which is worth knowing before you need it. Put all four to the service that would actually treat you, because they are the only people who can answer them.

Questions to take to the appointment

These are the ones that change what you walk out knowing. Ask them in your own words, and write the answers down, because nobody remembers a consultation accurately.

• What exactly would you remove, and what would be left behind?
• What do you expect this to change for me, and what will it probably not change?
• What happens if I wait another three months, and is there anything I could lose by waiting?
• How would we know it had not worked, and what would the next step be?
• What is the chance of this disc herniating again, in your own practice?
• If my leg is weak, how much of that strength do you expect to come back, and does how quickly we act change it?
• Afterward, will you be able to tell me how much of the back of the disc was left open, and what that means for this happening again?
• Which of my symptoms is the operation aimed at, and which are you not expecting it to touch?
• What restrictions would I have afterward, what are they protecting, and when do they lift?
• If I choose not to have it now, what should I be watching for, and how do I get back to you quickly?

Before you go in, write down the two or three things you most want to be able to do again. It keeps the appointment on your life rather than on your scan, and it is a surprisingly hard question to answer on the spot.

When to get help straight away

A page about a decision is exactly where a reader can talk themselves into waiting for an appointment that is weeks away.

The rule further up this page is that the leg tells you whether an exercise stays in. There is one exception. If the leg pain eases but numbness or weakness in the leg gets worse, stop the exercises and get medical advice the same day. The easing pain is what makes this one dangerous, because it reads as progress.

A leg or foot that is getting weaker, for example your foot drags, catches on the ground or slaps down when you walk (foot drop). Get medical advice the same day. If the weakness is getting worse by the hour, go to an emergency department.

If you have already had an operation or an injection, one more sign belongs here. A spinal infection does not always cause a fever, and a normal temperature is not a reason to be reassured. It is more likely if you have recently had spine surgery or an injection into your spine, inject drugs, or take medicine that weakens your immune system (Finucane and colleagues, 2020). If you have had spine surgery or a spinal injection in the last three months, contact your surgical team the same day about a fever, a wound that is red, hot, swollen or leaking, or back or leg pain that is new or much worse, even without a fever. Redness can be harder to see on brown or black skin.

The NHS also lists a leak of spinal fluid among the uncommon but serious complications of this family of operations. If you get a headache that comes on when you sit or stand up and eases again when you lie flat, or clear fluid leaking from your wound, contact your surgical team the same day.

The emergency signs below, including numbness around your genitals or bottom and new bladder or bowel trouble, need help straight away. The full list at the foot of this page gives every warning sign with how fast to act on it. None of them is a reason to decide anything about an operation. What changes is the order: the emergency signs need emergency help now, with somebody else driving, and the decision waits; the same-day signs mean being seen today; and the slower ones mean being seen before your next appointment rather than at it.

One line in that list names a different destination, because it is for a pregnant reader. New back pain in the second or third trimester, and back pain with a fever, bleeding from your vagina or pain when you pee, go to your midwife or maternity unit straight away. The emergency signs still count in pregnancy on top of that, and the NHS asks a pregnant woman who loses feeling in one or both legs, her bottom or her genitals to call emergency services or go to an emergency department.

Related exercise programs

• Lumbar disc herniation
• Sciatica
• Low back pain

Common questions

References

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Written and checked by the PocketPhysio editorial team. Last updated 2026-11-02.

This page is general education, not a diagnosis or a personal treatment plan. See a physiotherapist or doctor for advice about your own situation.