Back and Leg Pain: When Fast Recovery Slows Down

You strained your back about eight weeks ago. It set off a disc that was probably already sensitive, and that in turn irritated a nerve going into your right leg.

Then something happened that makes complete sense but feels awful. For the first three to five weeks you improved steadily. You could feel it getting better week by week. And then the improvement slowed down, and now you are left with leg tension, hip pain, back pain, and a back that does not feel like it belongs to you when you move.

Most people arrive at this point thinking the same thing: I got better, then I stopped getting better, so this must be as good as it gets.

It almost certainly is not. Section 5 explains why the curve flattens at exactly this stage, and why eight weeks is early rather than late.

This guide is not saying your pain is in your head. Your pain is completely real.

One thing before you start. This guide assumes I have examined you and checked the things that need checking. There is one genuine emergency attached to a disc problem. If nobody has examined you, read section 14 first.

The short version

• Pain is an alarm. It protects you. It does not measure damage.
• Recovery from this is steep then shallow. The flattening is the normal shape, not a stall. See section 5.
• Eight weeks feels long. In the natural course of this problem it is the middle, not the end.
• Nerve tension is a sensitive nerve, not a trapped one. See section 6.
• Your back is not unstable. What you are feeling is guarding, and guarding is reversible. See section 7.
• Disc herniations shrink on their own, and the worse they look the more likely they are to shrink.
• From here on, the thing that moves you forward is loading, not protecting.

1. Pain is an alarm, not a damage meter

Your body has danger sensors. They fire when tissue is stretched, squashed or irritated. They send warning signals to your spinal cord, and then to your brain. None of that is pain yet. It is just information.

Then your brain weighs it against everything else it knows: what you were doing, what happened last time, what you think it means, how stressed you are, whether you slept. Then it decides how much pain you need to feel in order to stay safe.

Pain is the answer to that question. Your brain produces it.

That is why damage and pain match up so badly. A paper cut is agony with almost no damage. Soldiers get badly hurt and feel very little until they are safe.

So how much it hurts now does not tell you how much damage is left. It tells you how protective your system is still being. Eight weeks in, protectiveness is a large part of the picture.

2. The pain gate

In 1965, two researchers called Ronald Melzack and Patrick Wall came up with an idea that changed pain medicine.

Picture a gate in your spinal cord. Warning signals have to pass through it to reach your brain. Open, and more gets through. Closed, and less does. Nothing in your back has to change for the pain to change. Only the gate setting.

What closes it: touch, heat, hands-on treatment, movement, sleep, feeling calm, and understanding what is going on.

What opens it: broken sleep, stress, low mood, testing the back to see if it still hurts, bracing before you move, and worrying that a nerve is being damaged. That last one is doing real work at your stage. Most people eight weeks into leg symptoms are quietly convinced something is being permanently squashed. Section 6 deals with that directly.

3. When the alarm gets too sensitive

Eight weeks is long enough for this to matter.

When a pain system has been busy for a couple of months, it does not wear out. It gets better at its job. The sensors fire more easily, and the brain concludes danger more quickly.

Think of a car alarm. When fitted, it went off if someone forced the door. Later it goes off when a cat walks past. The alarm is not broken. It is set too sensitive for the actual threat.

Part of what you are feeling now is a system that is still on high alert from six weeks ago, rather than a back that is still injured. That is genuinely good news, because sensitivity settles.

4. What actually happened

The strain itself was probably not the whole story. It was the thing that tipped a disc that was already under strain past what it could handle.

Part of the soft material inside the disc pushed out through the tough outer ring and reached a nerve root on the right.

Here is the part most people are never told, and it changes how you think about the whole thing. It is mostly not about something squashing the nerve.

The material inside a disc is chemically irritating to nerve tissue. When it escapes, it inflames the nerve root it touches. That inflammation does much of the work, not the pressure.

That explains several things:

• Why anti-inflammatory treatment can take the edge off.
• Why symptoms settle long before any scan changes.
• Why some people have a large bulge sitting right on a nerve and no symptoms at all.
• And why your fast early improvement happened. That was the inflammation settling.

5. Why the improvement slowed down

This is the section that matters most for you. The shape of this recovery is steep, then shallow. It is not a straight line and it was never going to be.

Three separate things are recovering, and they run on completely different clocks.

The inflammation. Fast. Weeks. That was your first three to five weeks, and it is why the early improvement felt so encouraging.

The disc itself. Slow. Months. Your body clears escaped disc material gradually, and that process is still underway.

The nerve's sensitivity. Slowest of the three. Nerve tissue settles more slowly than most tissue, and its sensitivity outlasts the irritation that caused it.

So the fast bit is finished and the slow bits are still running. That is exactly what a flattening curve looks like from the inside, and it is why this stage feels like a stall when it is not.

There is good trial evidence for this. Researchers compared people who had early surgery for sciatica with people who carried on without it. Between about week four and week twelve, the surgical group were clearly ahead. The people managing without surgery improved more slowly.

But by one year the two groups had converged and the difference had disappeared.

Read that again, because it is about you. The gap opens up in exactly the window you are sitting in now, and then it closes. The slow middle is a real, documented part of this, and people come out the other side of it.

Eight weeks feels like a long time to you. In the natural course of this problem, it is the middle.

6. What nerve tension actually is

Your nerves are not fixed cables. They glide and stretch as you move. Straighten your leg and the nerve running down it has to lengthen and slide within the tissues around it. It does this thousands of times a day and you never notice.

When a nerve root has been irritated, the whole nerve becomes more sensitive to being stretched. Not damaged. Sensitive. It starts objecting to a movement it used to do without complaint. That is what nerve tension is: a sensitive nerve that does not want to be lengthened. It is not a trapped nerve, and it is not a nerve being crushed.

Two things follow.

First, it lingers. Nerve sensitivity outlasts the problem that caused it, often by a good while. Feeling tension in that leg at eight weeks does not mean the disc is still pressing on something.

Second, nerves like to move. Complete rest does not settle a sensitive nerve, and aggressive stretching aggravates it. What they respond to is gentle, repeated movement through a comfortable range. Gliding rather than yanking.

An honest note on the evidence. Nerve gliding exercises show a positive effect on pain and function for back pain in the research, but the certainty of that evidence is rated very low. So they are worth doing, and I would not promise you they are the thing that fixes it. They are part of the plan, not the whole plan.

7. Why your back feels unstable, and why it is not

You told me your back feels like you cannot control it during movement. That it does not feel stable. This is one of the most common and most misunderstood things people describe at this stage, so let me be clear about it.

Your spine is not unstable. It is guarded.

Here is what the research consistently finds in people with back pain. The muscles around the spine do not switch off and go slack. They do the opposite. They work harder, stay switched on longer, and the trunk becomes measurably stiffer. The system tightens up.

That is a protective strategy, and it is your nervous system doing its job. After a painful episode it splints the area to keep it safe.

But splinting has costs, and they are exactly what you are describing:

• Movement feels effortful and clumsy, because you are moving against your own braced muscles.
• It feels unreliable, because the normal smooth coordination has been overridden by a cruder protective pattern.
• It fatigues quickly, because holding tension all day is tiring.
• It feels like weakness, when it is actually the opposite problem.

So the sensation of instability is coming from too much protective tension, not too little support. This matters enormously for what you do next, because the instinctive response, and a lot of the advice you will be given, is to brace harder and "strengthen your core to stabilise it". That adds more bracing to a system that is already over-braced.

What actually switches guarding off is confident, graded movement. Moving in ways that feel safe, then slightly less cautious, then normally. Your nervous system needs evidence that the movement is not dangerous, and the only way to give it that evidence is to do the movement.

True clinical instability is a specific, uncommon finding, and it is not what this is. I checked.

8. The hip pain

Two likely explanations, and both are unremarkable.

Referred pain. Structures in your low back share nerve pathways with the hip and buttock region. When they are irritated, the brain spreads the pain over a wider area than the actual source. Buttock and hip is the classic distribution. It is not a hip problem.

Doing the work differently. For eight weeks you have been moving carefully and unevenly. The muscles around your hip have been picking up jobs they do not normally do, in patterns they are not used to. They ache. That is a workload complaint, not an injury.

Either way it usually settles as the back settles and as your movement normalises. Tell me if it becomes the dominant problem, develops its own pattern, or starts limiting the hip itself.

9. What the disc is doing while you wait

Something genuinely useful, and it is happening right now.

Herniated discs shrink on their own. And the pattern is the opposite of what anyone expects: the worse they look, the more likely they are to shrink.

Researchers gathered the studies that scanned people and rescanned them later:

• A sequestration, where a fragment has broken off completely and the worst kind on paper: 96 in 100 shrank. In 43 in 100 it disappeared entirely.
• An extrusion: 70 in 100 shrank.
• A protrusion: 41 in 100.
• A simple bulge: 13 in 100. The reason makes sense once you hear it. When disc material escapes and meets your blood supply, your body treats it as something that does not belong and clears it away. The more material that escapes, the more there is to clear.

This is running in the background whether you think about it or not. It takes months, which is part of why the second half of this recovery is slower than the first.

10. What to do now

The balance has shifted. In the first fortnight, protecting was sensible. At eight weeks, protecting is the thing holding you back.

The rule for everything below: discomfort that rises while you move and settles back to your normal within about a day is acceptable. Still raised the next day means you did a bit too much. That is information, not damage. Repeat the easier version rather than pushing on.

Walking. The most underrated thing on this list. Build it up steadily. A large trial found a regular walking programme nearly doubled the time before back pain returned.

Nerve gliding. Gentle, repeated movement that takes the nerve through a comfortable range, stopping short of the pull. Little and often beats hard and occasional. I will show you which version suits you.

Graded return to the movements you have been avoiding. Make a list of what you have stopped doing since this started. Bending, lifting, twisting, getting in the car, whatever it is. We work through them in order, starting well below what worries you. This is how guarding switches off.

Strength work, starting light. Whole body, not just your back. Twice a week, building gradually. Not bracing exercises. Loading exercises.

Sleep and stress. Both feed straight into section 2, and both are worth attention at this stage.

And the expectation to hold on to: this is measured in months from here, not weeks. That is normal and it is not a sign of failure.

11. Things not worth your time

• Traction and inversion tables. Not recommended in the national guidance for this.
• Back belts and corsets. Same. They add external bracing to a system already over-braced.
• Gabapentin, pregabalin, steroid tablets and diazepam type drugs. National guidance advises against all of these for sciatica, because there is no overall evidence of benefit and there is evidence of harm. If you are already on one, do not stop on the strength of this guide. Some need reducing gradually. Take it to your GP.
• Another scan, unless surgery is genuinely on the table. A scan now will show the herniation that we already know is there, plus whatever ordinary age-related findings you happen to have, and it will not change what we do. It will give you new words to worry about.
• Prolonged rest. The thing that helped in week one is the thing that holds you back in week eight.

12. Flare-ups from here

You will have some. They do not mean the disc has gone again.

They are usually a pile-up: a poor night, a heavy day, a stressful week, a burst of activity after a quiet spell.

• Keep moving, gently. Reduce what you are doing rather than stopping.
• Drop back to your baseline for a few days, then build again.
• Go back to the movements that ease the leg.
• Watch where the pain sits, not just how bad it is. Pain retreating out of your leg and back towards your spine is progress, even if the back feels a bit worse for a day or two.
• Remind yourself that this settled before and will settle again.

Get in touch if it is not settling as it normally does, if the leg symptoms are clearly worse than they have been, or if anything in section 14 applies.

13. What treatment does, and what it does not

Hands-on treatment works through the mechanisms above. It closes the gate, calms sensitivity, and relaxes the guarding described in section 7. At your stage that matters, because reducing guarding is a large part of getting your movement back.

What it does not do is push the disc back in. Nothing is out of place and nothing gets put back. Anyone who tells you they can pop a disc back in is describing something that does not happen.

Think of a session as a window: a stretch of time where you can move more freely and more confidently, which you use to do the work in section 10. The movement is what shifts this in the long run.

• On measuring progress, and this matters at eight weeks when the pain score has stopped falling quickly. Better questions:
• Is the leg pain covering less ground than it did? Pain retreating up the leg is real progress.
• Can I sit for longer? Drive further? Sleep through?
• How many of the movements on my avoided list have I got back?
• Does my back feel more like mine when I move?

Those change before the pain number does, and at this stage they are the honest measure.

14. When to get urgent help

Almost all of this is not an emergency. A few things are, and with a disc involved they are worth knowing properly.

Go straight to A&E, or call 999

Do not wait to see if these settle. If you are offered a routine appointment, say you are worried about cauda equina syndrome and ask to be seen today.

• Numbness or a changed feeling between your legs, around your back passage or genitals. Including toilet paper feeling different when you wipe.
• Trouble starting to wee. Not being able to feel it coming out. Losing the feeling of a full bladder. Any new loss of control of your bladder or bowels.
• New numbness during sex, or new trouble getting an erection.
• Leg symptoms appearing in your left leg as well, or sciatica spreading from one leg to the other.
• New or quickly worsening weakness in either leg, or your leg giving way.

These are the warning signs that the bundle of nerves at the bottom of your spine is being compressed. It is rare, it is time critical, and the national pathway expects a scan within hours. Far better to go and be told you are fine.

Contact your GP or NHS 111 today

• Weakness that is getting worse, particularly if your foot starts to drag or catch, or you cannot lift the front of your foot properly.
• Numbness spreading over days rather than staying put.
• Back or leg pain with fever, shivering, or feeling generally unwell.
• Pain with unexplained weight loss, night sweats, or a past history of cancer. Worth reviewing rather than pushing on
• If you are no better at all by around twelve weeks, that is the point where we would talk about whether anything else is worth considering, including onward referral. Not because something is wrong, but because that is the sensible checkpoint.

Everything else, including a bad few days, can wait for a normal appointment.

15. If you want to read or watch more

Start here

• Tame the Beast. A five minute animation by Professor Lorimer Moseley. Particularly good on why sensitivity outlasts the injury. tamethebeast.org
• Flippin' Pain. A UK campaign about persistent pain. flippinpain.co.uk
• NHS advice on sciatica. nhs.uk/conditions/sciatica

Practical help

• Recovery Strategies, by Greg Lehman. A free illustrated workbook, very good on graded return to movement. greglehman.ca/recovery-strategies-pain-guidebook
• The Pain Toolkit, by Pete Moore. Good on pacing and getting activities back. paintoolkit.org

The research behind this guide

• Peul WC et al. Surgery versus prolonged conservative treatment for sciatica. New England Journal of Medicine, 2007. The recovery curves in section 5.
• Chiu CC et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clinical Rehabilitation, 2015. The shrinkage figures in section 9.
• Motor control changes in low back pain: divergence in presentations and mechanisms. Journal of Orthopaedic and Sports Physical Therapy, 2019. The guarding findings in section 7.
• Changes of trunk muscle stiffness in individuals with low back pain: a systematic review with meta-analysis. BMC Musculoskeletal Disorders, 2024. The increased stiffness finding in section 7.
• Baptista FM et al. Effectiveness of neural mobilisation on pain intensity, functional status and physical performance in adults with musculoskeletal pain: a systematic review with meta-analysis. Clinical Rehabilitation, 2024. The nerve gliding evidence, and its limitations, in section 6.
• Pocovi NC et al. An individualised, progressive walking and education intervention for the prevention of low back pain recurrence (WalkBack). The Lancet, 2024.
• Melzack R, Wall PD. Pain mechanisms: a new theory. Science, 1965. The original pain gate paper.
• NICE guideline NG59: Low back pain and sciatica in over 16s. The basis of section 11.

Bring your list of avoided movements from section 10 to your next appointment. At this stage that is the most useful thing you can arrive with.

This guide is general information. It does not replace the advice I give you in clinic.