How Long Should Sciatica Last Before You Get It Checked?
Most sciatica improves within six to twelve weeks as the irritated nerve settles. If your pain is not improving after six weeks, is getting worse, or comes with numbness or weakness in the leg, it is time to investigate further. Chronic sciatica lasting months often has a structural cause that only shows up on imaging.
Key takeaways
- Most episodes settle within six to twelve weeks with conservative care.
- Pain lasting beyond twelve weeks is considered chronic sciatica and warrants imaging.
- Numbness, progressive weakness, or bladder and bowel changes need urgent medical attention.
- Lying-down scans can miss alignment problems that a standing scan reveals under real body weight.
- A clear picture of the whole spine helps clinicians decide whether you need injections, physiotherapy, or surgery.
Sciatica is leg pain caused by irritation or compression of the sciatic nerve, usually in the lower back. It can feel like a burning line down the buttock and thigh, or a deep ache behind the knee. Most people recover naturally. But when sciatica drags on for months, there is usually a reason, and finding that reason early can change the outcome.
How long does sciatica normally take to recover?
Most sciatica recovery time falls within a six to twelve week window. During this period, a bulging disc may naturally resorb (shrink back), inflammation settles, and the nerve gradually calms. This is sometimes called the natural recovery phase.
If your symptoms are still significant at six weeks, that is a good moment to check in with your GP. If they are unchanged or worse at twelve weeks, you have crossed the threshold into chronic sciatica, and imaging becomes much more valuable.
When should you worry about sciatica?
Most sciatica is uncomfortable but not dangerous. However, certain signs mean you should seek help straight away, not wait for the twelve-week mark.
Your foot drops when walking, or your leg gives way. This suggests the nerve is losing function, not just sending pain signals.
Tingling or numbness that moves into the groin, inner thigh, or both legs needs prompt assessment.
Difficulty passing urine, loss of control, or saddle-area numbness is a medical emergency. Go to A&E or call 999 immediately.
Pain that does not ease in any position, disrupts sleep every night, or is getting noticeably worse week on week.
If you have any of the red-flag symptoms above, especially bladder or bowel changes, numbness, or sudden weakness, seek urgent medical attention from your GP, call 111, or go to A&E. Do not wait for a scan.
What causes sciatica to last for months?
When sciatica is not improving past the expected recovery window, there is usually a structural or biomechanical reason. The problem is often described as lumbar radiculopathy, where a nerve root in the lower back is compressed or irritated. Common causes include:
Disc material presses on the nerve root. Smaller bulges often resorb naturally, but larger ones may not.
The channel carrying the nerve narrows with age. This can squeeze the nerve roots, especially when standing or walking.
A tilted pelvis or spinal curve shifts load unevenly, overloading one side and compressing the nerve.
A specific pattern worth knowing about is L5 radiculopathy, where compression at the L5 nerve root causes pain down the outer leg and weakness lifting the foot. The exact nerve root involved shapes the treatment plan, which is why accurate imaging matters.
Why does a standing scan show what lying-down imaging misses?
Standard MRI and CT scans are taken lying down. In that position, your muscles relax, gravity stops pulling on the spine, and discs decompress slightly. The problem that causes your pain when you are upright may not be visible when you are lying flat.
An EOS scan images your entire skeleton while you stand naturally. Your spine carries your body weight, your pelvis tilts as it normally does, and any narrowing or slippage shows under real conditions. The scan uses about 90% less radiation than a standard X-ray, around ten times less.
ScanAlign standing EOS imaging captures the full chain from feet to skull in one pass, so your clinician can see whether a pelvic tilt or a curve higher up the spine is contributing to nerve compression lower down.
Lying-down imaging relaxes the muscles and removes gravity. A disc that bulges under load may appear normal. A vertebra that slips forward slightly when you stand can sit in its correct position when you lie flat. This means the scan may look reassuring even though your symptoms persist.
When is MRI the better choice? EOS shows bones, joints and alignment. For soft tissue detail, such as the disc itself, the nerve root, or inflammation, MRI is usually the better tool. In many cases of chronic sciatica, both types of imaging give the most complete picture.
What can you do while waiting for sciatica to improve?
Gentle movement generally helps more than bed rest. Staying active keeps the muscles supporting your spine from weakening, which can slow recovery. Walking, swimming, and specific stretches are often recommended.
Some people find yoga poses for sciatica helpful for maintaining mobility and reducing tension in the hip and lower back. Always check with your GP or physiotherapist before starting any new exercise if your symptoms are severe.
If your sciatica is lasting months and conservative care is not enough, your clinician may discuss injections, specialist physiotherapy, or in some cases surgery. Making that decision confidently depends on accurate imaging that shows what is happening under real weight-bearing conditions.
Sciatica not improving? A free video consultation with a specialist radiographer can help you understand whether a standing spine scan would add useful information for your clinician.
Book a free video consultationFrequently asked questions about sciatica recovery time
Most episodes improve within six to twelve weeks. Some people feel better in a few days, while others take the full three months. Pain that persists beyond twelve weeks is considered chronic sciatica.
Yes. Many cases resolve naturally as inflammation settles and disc bulges resorb over time. Staying gently active and avoiding prolonged sitting usually helps the process.
See your GP if pain is no better after six weeks, if it is getting worse, or if you develop numbness, weakness, or bladder and bowel changes. The last of these is a medical emergency.
Persistent sciatica often has a structural cause, such as a disc herniation, spinal narrowing, or a pelvic alignment issue, that keeps the nerve compressed. Imaging can help identify the specific cause.
Recurrence is quite common. Understanding the underlying cause, whether it is a disc issue, alignment problem, or narrowing, helps guide steps to reduce the chance of it returning.
An EOS scan captures your full skeleton in a single standing image with about 90% less radiation than a standard X-ray, around ten times less. It reveals how your spine, pelvis, hips and legs align under real body weight, which a conventional X-ray of just one area cannot show.
No. ScanAlign is a private self-pay clinic and you can self-refer. You start with a free video consultation to discuss whether a standing scan is appropriate for your situation.
Yes. The EOS system uses about 90% less radiation than a standard X-ray, around ten times less. It is one of the lowest-dose skeletal imaging methods available.
You can book a standing spine scan starting with a free video consultation. Pricing details are discussed during that call so you know exactly what to expect before committing.
Rarely, sciatica can indicate a condition needing urgent treatment, such as cauda equina syndrome. If you experience loss of bladder or bowel control, numbness in the saddle area, or sudden weakness in both legs, go to A&E or call 999 immediately.
Sciatica lasting longer than it should?
A free video consultation with a specialist radiographer can help you decide whether a standing spine scan is the right next step.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- NHS. Sciatica. nhs.uk. Available at: https://www.nhs.uk/conditions/sciatica/
- Valat JP et al. Sciatica. Best Practice & Research Clinical Rheumatology. 2010;24(2):241-252.
- National Institute for Health and Care Excellence (NICE). Low back pain and sciatica in over 16s: assessment and management. NICE guideline NG59. 2016 (updated 2020).
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.