How Long Should Sciatica Last Before You Get It Checked?
Most sciatica gets better within six to twelve weeks as the irritated nerve settles. Your pain may not be improving after six weeks. It may be getting worse, or come with numbness or weakness in the leg. If so, it is time to look into it further. Chronic sciatica that lasts for months often has a structural cause that only shows up on a scan.
Key points
- Most episodes settle within six to twelve weeks with conservative care.
- Pain that lasts beyond twelve weeks is called chronic sciatica and warrants a scan.
- Numbness, weakness that keeps getting worse, or changes in bladder and bowel need urgent medical care.
- Scans taken lying down can miss alignment problems that a standing scan shows 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. Finding that reason early can change the outcome.
How long does sciatica normally take to get better?
For most people, sciatica recovery takes six to twelve weeks. During this time, a bulging disc may naturally resorb (shrink back), inflammation settles and the nerve slowly calms down. This is sometimes called the natural recovery phase.
If your symptoms are still significant at six weeks, that is a good time to see your doctor. If they are the same or worse at twelve weeks, you have crossed into chronic sciatica. At that point, a scan becomes much more valuable.
When should you worry about sciatica?
Most sciatica is uncomfortable but not dangerous. But some signs mean you should get help straight away, not wait for the twelve-week mark.
Your foot drops when you walk, 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, the inner thigh or both legs needs to be checked promptly.
Difficulty passing urine, loss of control, or numbness in the saddle area is a medical emergency. Go to the emergency department of your nearest hospital or call for emergency help immediately.
Pain that does not ease in any position, wakes you every night, or is getting clearly worse week by week.
If you have any of the warning signs above, especially bladder or bowel changes, numbness or sudden weakness, get urgent medical help from a doctor or go to the emergency department of your nearest hospital. Do not wait for a scan.
What makes sciatica last for months?
When sciatica is not improving after the expected recovery time, there is usually a structural or biomechanical reason. The problem is often called 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 that carries the nerve narrows with age. This can squeeze the nerve roots, especially when standing or walking.
A tilted pelvis or a curve in the spine shifts load unevenly. This overloads one side and compresses the nerve.
One pattern worth knowing about is L5 radiculopathy. Here, 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. This is why an accurate scan matters.
Why does a standing scan show what a lying-down scan misses?
Standard MRI and CT scans are taken lying down. In that position, your muscles relax, gravity stops pulling on the spine and the 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 whole chain from feet to skull in one pass. This lets your clinician see whether a pelvic tilt or a curve higher up the spine is adding to nerve compression lower down.
A lying-down scan relaxes the muscles and removes gravity. A disc that bulges under load may look normal. A vertebra that slips forward slightly when you stand can sit in its correct place when you lie flat. So the scan may look reassuring even though your symptoms carry on.
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 scan together give the most complete picture.
What can you do while waiting for sciatica to get better?
Gentle movement generally helps more than bed rest. Staying active stops the muscles that support 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 keeping mobile and easing tension in the hip and lower back. If your symptoms are severe, always check with your doctor or physiotherapist before starting any new exercise.
If your sciatica lasts for months and conservative care is not enough, your clinician may discuss injections, specialist physiotherapy or, in some cases, surgery. Making that decision with confidence depends on an accurate scan that shows what is happening under real weight-bearing conditions.
Before you start a treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
Sciatica not getting better? 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 lasts beyond twelve weeks is called chronic sciatica.
Yes. Many cases clear up naturally as inflammation settles and disc bulges resorb over time. Staying gently active and avoiding long periods of sitting usually helps this process.
See your doctor if the 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.
Sciatica that carries on often has a structural cause that keeps the nerve compressed, such as a disc herniation, spinal narrowing or a pelvic alignment problem. A scan can help find the specific cause.
It coming back is quite common. Understanding the underlying cause, whether it is a disc problem, an alignment problem or narrowing, helps guide steps to lower 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 shows how your spine, pelvis, hips and legs line up under real body weight. A conventional X-ray of just one area cannot show this.
No. ScanAlign is a private self-pay clinic and you can refer yourself. You start with a free video consultation to discuss whether a standing scan is right 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.
The price for patients travelling from abroad is confirmed during the free video consultation, which is how you book a standing spine scan.
Rarely, sciatica can point to a condition that needs urgent treatment, such as cauda equina syndrome. If you have loss of bladder or bowel control, numbness in the saddle area, or sudden weakness in both legs, go to the emergency department of your nearest hospital or call for emergency help 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.