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Part of Sciatica

When is sciatica an emergency? The signs that cannot wait

Sciatica is rarely an emergency: the NHS says most sciatica gets better within a few weeks to a few months, and leg pain on its own is seldom the reason for emergency care. Sciatica becomes an emergency when it comes with 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: call emergency services or go to an emergency department straight away, and do not drive yourself. Call emergency services, too, for back or leg pain after a serious accident or with chest pain, for sudden, severe back or tummy pain unlike your usual pain if you are over 60, smoke or used to smoke, have high blood pressure or an aneurysm, or if it comes with feeling faint or clammy skin, and for a foot or leg that suddenly turns cold, pale or blue. Back pain with a fever and new leg weakness, numbness or tingling is an emergency, and so is back pain that spreads down a leg, or comes with leg weakness, numbness or trouble walking, if you have had cancer, or new back pain after even a minor fall if you have a stiff spine condition such as ankylosing spondylitis. A leg or foot that is getting weaker, such as a foot that drags or slaps down as you walk (foot drop), means getting medical advice the same day, and going to an emergency department if the weakness is getting worse by the hour. This page sorts every sign by urgency.

Warning signs, and when to get help

When is sciatica an emergency?

Only with a small set of signs, and knowing them lets you get on with recovery the rest of the time. Sciatica can hurt a great deal, but the pain level is not what decides urgency. What decides it is whether the nerves are losing their function, and whether something other than an irritated nerve root might be behind the leg pain.

The most urgent signs all come from the bundle of nerve roots at the bottom of your spine (the cauda equina). Those nerves control your bladder, bowel and sexual function, and carry feeling from the skin around your genitals and bottom. Pressure on them shows up as numbness or a changed feeling in that saddle area (the parts of you that would touch a bike saddle), new trouble starting, feeling or controlling your pee, not noticing when you need to poo or not being able to hold it, or a new change in sexual feeling. Pain, tingling, numbness or weakness in both legs belongs here too, and so does losing feeling in one leg.

Any of these means calling emergency services or going to an emergency department straight away: the ER in the USA, A&E in the UK. The warning list below gives the exact wording for each.

Losing feeling in a leg is not the same as the pins and needles or numb patch in part of one leg or foot that sciatica often brings (NHS), which is not an emergency on its own. If that numbness is spreading or getting worse, get medical advice the same day, as the foot drop section below explains.

Speed matters because these nerves recover less well the longer they stay squashed. Outcomes are poorest when the bladder has already stopped emptying and the person cannot feel that it is full, so surgeons try to relieve the pressure before it gets that far, usually with an emergency operation once a scan confirms it. NHS England's national pathway treats suspected cauda equina syndrome as an emergency, with an MRI scan within four hours of the request when the symptoms started or got worse in the last two weeks (GIRFT).

Whenever your symptoms started, the advice on this page is the same: act straight away. Do not wait to see whether it passes overnight. Do not drive yourself there, especially if your leg is numb or weak: ask someone to drive you or call an ambulance. Driving with sciatica explains why braking suffers. If the checks find nothing serious, that is a good result, not a wasted trip.

Several other patterns need emergency care, even though they are less about the leg itself. Back or leg pain that started after a serious accident means calling emergency services, and if the pain began straight after it, keep still while you wait (NICE NG41). Call emergency services, too, for back pain that arrives together with chest pain: the problem may not be coming from your back. Sudden, severe back or tummy pain unlike your usual pain means calling emergency services straight away if you are over 60, smoke or used to smoke, have high blood pressure or know you have an aneurysm, or if it comes with feeling faint, clammy skin, a racing heartbeat or breathlessness, because the main blood vessel in the tummy can burst (NICE NG156). If you have a condition that stiffens the spine, such as ankylosing spondylitis, and new back pain starts after a fall or jolt, however minor, call emergency services or go to an emergency department straight away, and let someone else do the driving.

After cancer, now or in the past, back pain that wraps round your body like a tight band, or comes with pain spreading down a leg, leg weakness, numbness or trouble walking, can mean pressure on the spinal cord: call your cancer team's emergency number straight away, or go to an emergency department if you cannot get through (NICE NG234). Back pain with a fever and new weakness, numbness or tingling in a leg can mean an infection pressing on the nerves, which can leave lasting weakness if it is found late (Darouiche, 2006), so call emergency services or go to an emergency department straight away.

One more emergency is about the blood supply to the leg rather than its nerves. A foot or leg that suddenly turns cold, pale or blue, or suddenly becomes very painful, numb or weak even while you are resting, can mean the artery to the leg is blocked, so call emergency services or go to an emergency department straight away (Cleveland Clinic). The list below gives each of these in full. When back pain is serious explains the back-led signs in more depth.

Is foot drop an emergency?

It is urgent, and how fast it is changing decides where you go. Foot drop means the muscles that lift the front of your foot have weakened, so your toes catch on the ground, the foot slaps down as you walk, or you trip on steps and curbs. The nerve supply to those muscles runs through the lower back, which is why sciatica can cause it.

Get medical advice the same day, and go to an emergency department if the weakness is getting worse by the hour. The same applies to weakness elsewhere in the leg, such as a knee that has started to give way or a foot you can no longer push up onto your toes with. The international red flags framework for the spine lists a nerve problem that keeps getting worse, such as spreading weakness or numbness, among its warning signs (Finucane and colleagues, 2020), because a nerve that is losing function needs assessing promptly. New leg weakness is an emergency, not same day, if you have had cancer or you also have a fever or feel very unwell: the emergency signs above say where to go.

If a scan shows a disc pressing on the nerve and the weakness is marked or getting worse, a spinal surgeon may offer an operation within days, rather than waiting the usual weeks to see whether it settles. In one large study, weakness recovered faster when the operation came within 48 hours of it starting (Petr and colleagues, 2019). Surgeons differ on how soon to operate and for how much weakness, so your own spinal team's advice comes first.

There is one more pattern to watch. When the leg pain eases but the numbness or weakness gets worse, the nerve may be working less well, even though it hurts less. Stop your exercises and get medical advice the same day.

Which sciatica symptoms need a doctor the same day?

Same day means getting advice today, not waiting for the next routine appointment. Ring your own doctor, go to an urgent care center, or call a phone advice line such as NHS 111. Besides foot drop, the signs below sit at this level.

A fever with back or leg pain, or feeling hot, cold, shivery or generally unwell, can be a sign of infection. Get medical advice the same day, and go to an emergency department if you feel very unwell. A spinal infection does not always cause a fever, and 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.

New back or leg pain when you have had cancer, now or in the past, or have lost weight without trying, also means getting medical advice the same day and telling the doctor. If you have had cancer and the back pain spreads down a leg or comes with weakness, numbness or trouble walking, it is the cancer emergency above instead. If you are older, have low bone density or have taken steroid tablets for a long time, get medical advice the same day for back pain that follows a minor fall or strain: in those groups a bone in the spine can break with very little force. Severe pain that comes on suddenly or keeps getting worse quickly also means getting medical advice the same day, unless it is the sudden, severe back or tummy pain described under emergencies above.

The last one is easy to blame on sciatica. A calf or thigh that has become swollen, warm, tender, red or darker, or a throbbing or cramping pain that does not fit your sciatica, can be a blood clot, especially after surgery, a long trip or a spell of being much less mobile. Get medical advice the same day, and call emergency services if you are also short of breath or have chest pain.

What can wait a few days, and what is routine?

Pain that does not ease at all with rest or changing position, or is worse at night, means seeing your doctor within a few days, or the same day if you also feel unwell, have lost weight without trying or have had cancer. Most night pain with sciatica is not this: it eases when you move or change position. How to sleep with sciatica has positions to try.

Leg pain or aching that comes on with walking and eases after a few minutes' rest is a routine reason to book an appointment with your doctor if nobody has checked it. A narrowed spinal canal (spinal stenosis) and narrowed leg arteries both cause that pattern, and they need different treatment. If the distance you can walk has shrunk a lot over a few weeks, see your doctor within a few days instead.

Sciatica that simply is not improving is routine too. The NHS advises seeing a GP or physio if it has not improved after a few weeks, is getting worse or is stopping your normal activities. How long sciatica lasts covers what to expect over the weeks and months.

What happens at the ER or A&E?

Expect questions first. The doctor will ask how the leg pain started, whether anything has changed with your bladder, bowels or sexual function, and about fever, cancer and recent injuries. Then they test the strength, reflexes and feeling in both legs, including the skin around your genitals and bottom, because that is where cauda equina problems show first.

If cauda equina syndrome is suspected, an urgent MRI scan follows, and if it shows a disc or something else pressing on the nerves, the usual treatment is an emergency operation to relieve the pressure. If it is not, or the scan rules it out, you go home with advice and a plan for the sciatica itself. For people without warning signs, NICE advises against routine imaging outside specialist care and keeps scans for when the result is likely to change the treatment (NICE NG59).

Most sciatica settles

None of these signs is common, and most people with sciatica will never meet one. The international red flags framework that physios and doctors use describes warning signs as prompts for a careful history and examination, not a checklist, because good evidence on how accurate most of them are is lacking (Finucane and colleagues, 2020). That cuts both ways: no single sign proves something serious, and none should be ignored.

For the everyday part of recovery, the sciatica program has staged exercises, exercises to avoid with sciatica covers what to pause, and sciatic nerve flossing explains the gentle nerve movements in the program. Keep the list below somewhere handy, and come back to it if anything changes.

Related exercise programs

Warning signs

Get emergency help now

  • Emergency: numbness, tingling or altered feeling around or under your genitals, between your inner thighs, or around your bottom (anus), for example it feels different when you wipe after using the toilet. Call emergency services or go to an emergency department straight away. This can be a sign of pressure on the bundle of nerves at the base of the spine (cauda equina syndrome), which needs emergency treatment.
  • Emergency: you find it hard to start peeing, cannot pee, cannot feel yourself peeing or cannot control when you pee, or you do not notice when you need to poo or cannot control when you poo, and this is not normal for you. The same applies to a new change in how your genitals feel during sex, or new trouble getting an erection or ejaculating. Call emergency services or go to an emergency department straight away. These can also be signs of cauda equina syndrome.
  • Emergency: sciatica in both legs, or pain, tingling, numbness or weakness in both legs. The same applies if you lose feeling in one leg. Call emergency services or go to an emergency department straight away.
  • Emergency: back or leg pain that started after a serious accident, such as a car crash or a fall from a height, or back pain with chest pain. Call emergency services. If the pain started straight after the accident, keep still while you wait.
  • Emergency: sudden, severe pain in your lower back or tummy that is not like your usual back pain, if you have been told you have a swelling of the main blood vessel in your tummy (abdominal aortic aneurysm), you are over 60, you smoke or used to smoke, or you have high blood pressure. The same applies if sudden, severe back or tummy pain comes with feeling faint or passing out, pale, sweaty or clammy skin, a racing heartbeat or being short of breath. Call emergency services straight away. This can be a sign of an aneurysm bursting, which needs treatment in hospital at once.
  • Emergency: new neck or back pain after a fall, a knock or a jolt, even a minor one such as a trip or a sudden stop in a car, if you have a condition that stiffens the spine, such as ankylosing spondylitis. Call emergency services or go to an emergency department straight away, do not drive yourself, and tell the staff about your spine condition, so they keep your neck and back in their usual position. A stiff spine can break after a small injury, and the break is easy to miss at first. If the pain started straight after the injury, or you also have numbness, tingling or weakness in your arms or legs, keep still and call emergency services.
  • Emergency: you have had cancer, now or in the past, and your back or neck pain feels like a tight band around your body, or comes with pain spreading down an arm or leg, weakness, numbness or pins and needles in your arms or legs, trouble walking, or trouble controlling your bladder or bowels. Call your cancer team's emergency number straight away, or go to an emergency department if you do not have one or cannot get through. This can be cancer pressing on the spinal cord (metastatic spinal cord compression), which needs treatment straight away.
  • Emergency: back pain with a fever, or you feel hot, shivery or very unwell, and you also have new weakness, numbness or tingling in one or both legs, or new trouble with your bladder or bowels. Call emergency services or go to an emergency department straight away. This can be an infection pressing on the nerves in the spine (spinal epidural abscess), which needs emergency treatment.
  • Emergency: your foot or leg suddenly turns cold, pale or blue, or suddenly becomes very painful, numb or weak, even while you are resting. Call emergency services or go to an emergency department straight away. This can be a sign that the blood supply to the leg is blocked, which needs treatment at once.

Get help today

  • Same day: 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.
  • Same day: a calf or thigh that is newly swollen or getting more swollen, warm, tender, red or darker than usual, has swollen veins that are sore to touch, or has a throbbing or cramping pain that does not fit your injury or condition, or that feels different from normal muscle soreness after exercise. This can be a sign of a blood clot (deep vein thrombosis), especially after surgery, an injury, time in a cast or boot, a long trip or a spell of being much less mobile than usual. Get medical advice the same day. If you are also short of breath or have chest pain, call emergency services.
  • Same day: back or leg pain with a fever, or you feel hot, cold, shivery or generally unwell. Get medical advice the same day, and go to an emergency department if you feel very unwell.
  • Same day: new back or leg pain and you have had cancer, now or in the past, or you have lost weight without trying. Get medical advice the same day and mention it. If you are being treated for cancer now, contact your cancer team the same day.
  • Same day: back pain after a minor fall or strain if you are older, have low bone density (osteoporosis) or have taken steroid tablets for a long time. Get medical advice the same day.
  • Same day: severe pain that comes on suddenly or is getting worse quickly. Get medical advice the same day.
  • Same day: pain that does not ease at all with rest or changing position, or is worse at night. Get medical advice the same day if you also feel unwell, have lost weight without trying, or have had cancer, now or in the past.

Book an appointment

  • Within a few days: pain that does not ease at all with rest or changing position, or is worse at night. See your doctor within a few days.
  • Routine: pain or aching in a leg that comes on when you walk and goes after a few minutes' rest, and a doctor has not checked it yet. Book an appointment with your doctor. Narrowed arteries in the legs (peripheral arterial disease) can cause this too, and they need different treatment. If the distance you can walk before the pain starts has become much shorter over a few weeks, see your doctor within a few days. Pain, tingling, numbness or weakness in both legs is on the emergency list above.

Common questions

Should I go to the ER or A&E with sciatica?

Go, or call emergency services, if you have any of these. Numbness, tingling or altered feeling around or under your genitals, between your inner thighs, or around your bottom (anus), for example it feels different when you wipe after using the toilet. Call emergency services or go to an emergency department straight away. This can be a sign of pressure on the bundle of nerves at the base of the spine (cauda equina syndrome), which needs emergency treatment. You find it hard to start peeing, cannot pee, cannot feel yourself peeing or cannot control when you pee, or you do not notice when you need to poo or cannot control when you poo, and this is not normal for you. The same applies to a new change in how your genitals feel during sex, or new trouble getting an erection or ejaculating. Call emergency services or go to an emergency department straight away. These can also be signs of cauda equina syndrome. Sciatica in both legs, or pain, tingling, numbness or weakness in both legs. The same applies if you lose feeling in one leg. Call emergency services or go to an emergency department straight away. Do not drive yourself: ask someone to drive you or call an ambulance. Call emergency services, too, for back or leg pain that started after a serious accident, such as a car crash or a fall from a height, or back pain with chest pain; if the pain started straight after the accident, keep still while you wait. Call emergency services straight away for sudden, severe back or tummy pain that is not like your usual back pain if you are over 60, smoke or used to smoke, have high blood pressure or have been told you have an aneurysm, or if it comes with feeling faint or passing out, pale, sweaty or clammy skin, a racing heartbeat or being short of breath. Do the same for back pain with a fever, or feeling hot, shivery or very unwell, together with new weakness, numbness or tingling in one or both legs or new trouble with your bladder or bowels, and for a foot or leg that suddenly turns cold, pale or blue, or suddenly becomes very painful, numb or weak even while you rest. If you have a stiff spine condition such as ankylosing spondylitis and get new back pain after a fall, knock or jolt, even a minor one, call emergency services or go to an emergency department straight away. Do not drive yourself, and tell the staff about your spine condition. If you have had cancer, now or in the past, back pain with pain spreading down a leg, weakness, numbness or pins and needles in your legs, trouble walking, or trouble with your bladder or bowels means calling your cancer team's emergency number straight away, or going to an emergency department if you cannot get through.

Is foot drop from sciatica an emergency?

It is urgent: get it checked the same day, and treat it as an emergency if the weakness is getting worse by the hour or comes with any emergency sign, such as 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 the leg. For those, call emergency services or go to an emergency department straight away. New leg weakness is also an emergency if you have a fever or feel hot, shivery or very unwell (call emergency services or go to an emergency department straight away), or if you have had cancer, now or in the past (call your cancer team's emergency number straight away, or go to an emergency department if you cannot get through). 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. Foot drop means the nerve supply to the muscles that lift the front of your foot is not working properly, and a doctor or physio will want to test your strength and feeling and decide whether you need a scan or a specialist.

What will the hospital do for sciatica?

A doctor will ask about your leg symptoms and about your bladder, bowels and sexual function, then test the strength, reflexes and feeling in your legs, including the skin around your genitals and bottom. If they suspect cauda equina syndrome, they arrange an urgent MRI scan: in England, the national pathway asks for it within four hours of the request when the symptoms started or got worse in the last two weeks. That timing is for the hospital: for you, any cauda equina sign means going straight away, however long you have had it. If the scan shows pressure on the nerves, the usual treatment is an emergency operation to relieve it. If the scan and examination do not show it, you go home with a plan for sciatica, and that is a good outcome, not a wasted trip. Without signs of something serious, NICE advises against routine scans for sciatica outside specialist care.

Is sciatica pain at night a warning sign?

Usually not on its own. Lying still for hours, or in one position the nerve dislikes, is enough to make an irritated nerve ache, and that kind of night pain eases when you change position or get up. The pattern to act on is different. Pain that does not ease at all with rest or changing position, or is worse at night. See your doctor within a few days. Get medical advice the same day if you also feel unwell, have lost weight without trying, or have had cancer, now or in the past. If you are being treated for cancer now, contact your cancer team the same day.

References

  1. NHS. Sciatica. https://www.nhs.uk/conditions/sciatica/
  2. NHS. Back pain. https://www.nhs.uk/conditions/back-pain/
  3. NHS. Slipped disc. https://www.nhs.uk/conditions/slipped-disc/
  4. Getting It Right First Time (GIRFT), NHS England. National suspected cauda equina syndrome (CES) pathway. February 2023, updated March 2026. https://gettingitrightfirsttime.co.uk/wp-content/uploads/2026/04/National-Suspected-Cauda-Equina-Pathway-March-2026.pdf
  5. Finucane LM, Downie A, Mercer C, et al. International framework for red flags for potential serious spinal pathologies. Journal of Orthopaedic and Sports Physical Therapy. 2020;50(7):350-372. https://doi.org/10.2519/jospt.2020.9971
  6. National Institute for Health and Care Excellence. Low back pain and sciatica in over 16s: assessment and management (NG59). Published 2016, last updated July 2026. https://www.nice.org.uk/guidance/ng59
  7. National Institute for Health and Care Excellence. Spinal metastases and metastatic spinal cord compression (NG234). Published September 2023. https://www.nice.org.uk/guidance/ng234
  8. National Institute for Health and Care Excellence. Spinal injury: assessment and initial management (NG41). Published February 2016. https://www.nice.org.uk/guidance/ng41
  9. Darouiche RO. Spinal epidural abscess. New England Journal of Medicine. 2006;355(19):2012-2020. https://doi.org/10.1056/NEJMra055111
  10. NHS. Abdominal aortic aneurysm. https://www.nhs.uk/conditions/abdominal-aortic-aneurysm/
  11. National Institute for Health and Care Excellence. Abdominal aortic aneurysm: diagnosis and management (NG156). 2020. https://www.nice.org.uk/guidance/ng156
  12. NHS. Deep vein thrombosis (DVT). https://www.nhs.uk/conditions/deep-vein-thrombosis-dvt/
  13. Cleveland Clinic. Acute limb ischemia. https://my.clevelandclinic.org/health/diseases/acute-limb-ischemia
  14. Bjorck M, Earnshaw JJ, Acosta S, et al. European Society for Vascular Surgery (ESVS) 2020 clinical practice guidelines on the management of acute limb ischaemia. European Journal of Vascular and Endovascular Surgery. 2020;59(2):173-218. https://doi.org/10.1016/j.ejvs.2019.09.006
  15. Petr O, Glodny B, Brawanski K, et al. Immediate versus delayed surgical treatment of lumbar disc herniation for acute motor deficits: the impact of surgical timing on functional outcome. Spine. 2019;44(7):454-463. https://doi.org/10.1097/BRS.0000000000002295

Written and checked by the PocketPhysio editorial team. Last updated 2026-10-16.

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