Sciatica after injection: what to do if the pain returns or persists?
The injection offered little relief for your leg, its effect lasted only a few days, or the pain returns after a period of improvement? The answer obtained deserves to be analyzed before repeating the injection, changing treatment, or concluding that an operation is necessary.
A lack of effect, partial improvement, and temporary relief do not tell the same story. The trajectory of the pain, intensity, function, level injected, product used, and alignment with imaging must be reviewed together.
What can one feel in the first few days?
The instructions from the team that performed the injection always take precedence over general information. Depending on the product, the injection route, and your health status, the effect may not manifest at the same moment.
Immediate Relief
A local anesthetic may reduce pain for a few hours. This quick effect does not allow for certainty on the duration of the benefit from the corticosteroid.
Transient Pain Surge
Pain at the injection site or a temporary increase in symptoms may occur for a few days. Significant worsening, prolonged symptoms, or those accompanied by a neurological sign require consultation.
Delayed Effect
Hospital documents indicate that the corticosteroid may take several days to reach its full effect. Adhere to the follow-up timeline given by the doctor before assessing the result.
What does your response profile mean?
| Observed Response | Cautious Interpretation | Possible Next Step |
|---|---|---|
| No change | The medication may not have produced a measurable effect; the level or mechanism might be different, or the pain could originate from another structure. | Review the report, target, diagnosis, neurological examination, and options with the doctor. |
| Relief only for a few hours | The local anesthetic may explain the initial effect without demonstrating a lasting response to corticosteroids. | Wait for the indicated period, record the function, and communicate the precise result to the doctor. |
| Partial improvement | The inflammatory component may have decreased without all pain constraints or causes being modified. | Use the relief window cautiously to resume activities and reassess remaining limitations. |
| Good improvement followed by a gradual return | The infiltration may have provided temporary benefit, which is consistent with data showing mainly short-term effects. | Compare duration, functional gain, and risks before any further intervention. |
| Different pain or new symptoms | A change in territory or a deficit may signal an evolution that should not automatically be attributed to usual sciatica. | Quickly seek medical advice; urgency if the deficit is significant or progressive. |
How to accurately measure the result?
An overall pain score is not enough. Measure the same elements as before the injection and separate leg pain from lumbar pain. The injection primarily targets radicular pain; lumbar pain may react differently.
- Course: how far does the pain go down today?
- Intensity: average pain and worst pain in the leg.
- Walking: distance or duration before stopping.
- Sitting position: time tolerated before symptoms increase.
- Sleep: number of awakenings and most tolerated position.
- Medication: change of consumption only according to the medical plan.
- Strength: foot dragging, difficulty on heels or toes, stairs.
- Significant activity: driving, working, personal care, or family activity.
Why might relief be limited or temporary?
An epidural injection primarily acts on inflammation and pain around a root; it does not remove a herniated disc, does not permanently enlarge a foramen, and does not correct instability. Its goal may be to create a window of relief allowing movement, sleep, or participation in rehabilitation.
The systematic review from the American Academy of Neurology published in 2025 concludes that, among individuals with radiculopathy, epidural corticosteroid injections may modestly reduce pain and disability for up to approximately three months in some people. The abridged Cochrane review from 2020 also concludes small short-term effects, with significant uncertainty regarding safety.
Modest average effect
A statistically measurable result does not mean that every patient will experience a significant improvement.
Variable individual response
The cause, level, duration of symptoms, and neurological profile can influence the outcome without allowing for perfect prediction.
No structural correction
A reduced pain does not prove that the compression has disappeared; persistent pain also does not prove that surgery is mandatory.
What should be reassessed if pain persists?
The follow-up should compare the infiltrated level with the presumed root, the affected side, and the actual path. It should also be checked whether the presentation remains compatible with sciatica or if hip pain, peripheral neuropathy, vascular involvement, or another cause should be considered.
- Intervention report: route used, level, side, products, and particular event.
- Chronological response: immediate effect, effect after several days, best time, and recurrence of symptoms.
- Neurological examination: strength, sensitivity, reflexes, and walking progression.
- IRM correlation: is the lesion located at the expected level and side?
- Functional objective: has the improvement allowed for a useful recovery?
- Other diagnoses: could the pain originate from another structure or a more serious condition?
Should the injection be repeated?
A new injection is not automatic. The decision lies with the doctor and depends on the benefit obtained, its duration, the function gained, the product and dosage, other illnesses, side effects, and alternatives. A fixed series should not be presented as necessary for everyone.
Questions promoting structured discussion
- Did the first action reduce the pain in the leg?
- Did the benefit allow for measurable functional improvement?
- How long did the useful effect last?
- Are the level and the pathway still considered appropriate?
- What is the concrete objective of a new injection?
Questions about cumulative risks
- What dose of corticosteroids has already been received?
- Does diabetes, osteoporosis, infection, or anticoagulant treatment alter the risk?
- Would a new injection delay a more appropriate opinion?
- What side effects should be monitored?
- What will be done if the second result is also insufficient?
Can neurovertebral decompression be considered after an infiltration?
An infiltration and a decompression neurovertebrale with motorization do not have the same objective. The infiltration is a medical procedure aimed particularly at the inflammatory component. The motorized decompression is a form of controlled traction that seeks to temporarily modify certain mechanical constraints; it does not remove a hernia and does not replace indicated surgery.
At Clinique TAGMED, a decompression does not automatically begin after an infiltration. The professional must know the date, the treated level, the product, the response, and any restrictions. As a precaution, the clinic usually requires that at least two weeks have passed after the infiltration; a longer medical directive or any complication takes precedence.
NICE recommends not offering routine traction for low back pain with or without sciatica. The quality of data on lumbar traction remains limited and heterogeneous. A trial of decompression can therefore only be discussed in a selected situation, without urgency, with measurable objectives and no guarantees.
Prepare a TAGMED evaluation after an infiltration
Clinique TAGMED does not perform infiltrations. It can evaluate persistent or recurrent pain within the limits of osteopathy and determine if a conservative approach can be discussed or if a new medical direction is preferable.
Infiltration Report
Provide the date, level, side, route, and products indicated in the medical document.
Response Journal
Note the immediate effect, best result, duration, return of symptoms, and any modified functions.
Imaging and Reports
Provide MRI, X-ray, or CT scan reports along with the physician’s recommendations.
TAGMED Clinic Montreal / Mont-Royal
1140 Beaumont Avenue
Mont-Royal, QC, H3P 3E5
Phone: 1 877 672-9060
Days: Tuesday and Thursday
TAGMED Clinic Terrebonne
1150 Lévis Street, Suite 200
Terrebonne, QC, J6W 5S6
Phone: 450 704-4447
Days: Monday, Wednesday, and Friday
Frequently Asked Questions after a Sciatica Injection
How long should I wait to know if the injection is working?
The timeline depends on the product and the doctor’s instructions. An anesthetic can work quickly, while the effect of corticosteroids may take several days. Some hospital documents indicate that maximum benefit may take up to about a week. Use the timeframe provided by the team that performed your procedure.
Is it normal to have more pain after the injection?
Sensitivity at the site or a temporary increase in pain may occur for a few days. Severe or prolonged worsening, fever, increasing redness, discharge, new weakness, difficulty urinating, or sphincter issues require prompt or urgent medical attention.
Does the absence of relief mean the wrong level was injected?
Not necessarily. The lack of effect may have several explanations: a mechanism not sensitive to corticosteroids, a different target, a more complex disease, or a neighboring diagnosis. The level, route, report, MRI, and examination need to be reviewed together.
Why does the pain return after a few weeks?
Infiltration can temporarily reduce inflammation without eliminating the underlying structural or mechanical cause. A return of pain does not automatically indicate a complication. Note its progression and discuss the functional outcome and alternatives with your doctor.
How many injections can one receive?
There is no universal number applicable to all. The dose of corticosteroids, other illnesses, previous responses, cumulative risks, and alternatives influence the decision. Only the doctor who knows your case can propose an appropriate schedule.
Should an MRI be repeated if the injection doesn’t work?
Not automatically. New imaging is mainly relevant if symptoms have changed, a deficit has appeared, or if the results would modify the management. The doctor compares existing imaging, the examination, and the evolution before prescribing a new test.
Can one resume exercises after the injection?
Follow the instructions of the procedural team. A gradual return may be considered when sensitivity and strength have returned and activity is permitted. Avoid using temporary relief to abruptly increase loads or test aggressive exercises.
When can neurovertebral decompression be started after the injection?
At TAGMED, a wait of at least two weeks is typically requested as a precaution, but the doctor’s instructions, the injected product, the response, and any complications may necessitate a longer delay. An evaluation is necessary before starting or resuming.
Does an ineffective injection mean that surgery is necessary?
No. A surgical decision depends on pain, function, deficit, duration, previous treatments attempted, and congruent imaging. A surgical opinion may become relevant if pain and function do not improve, but an ineffective injection alone does not determine the course of action.
What symptoms after the injection require urgent attention?
New significant or rapidly progressive weakness, loss of urinary or bowel control, saddle anesthesia, urinary retention, fever with worrying general condition, difficulty breathing, allergic reaction, visual disturbance, confusion, or seizure justify immediate medical assistance.
Sources and Clinical References
- American Academy of Neurology — Epidural Steroids for Cervical and Lumbar Radicular Pain and Spinal Stenosis, systematic review, 2025.
- Oliveira et al. — Epidural Corticosteroid Injections for Sciatica: abridged Cochrane review and meta-analysis, 2020.
- NICE NG59 — Low back pain and sciatica in people over 16: assessment and management.
- Assurance Maladie — Medical consultation and treatment for sciatica, updated March 20, 2026.
- University College London Hospitals — Caudal epidural injection: risks and aftercare, updated January 29, 2026.
- Dudley Group NHS — Transforaminal epidural injections: patient information and follow-up.
Is the effect of your injection insufficient or temporary?
If your situation is not urgent and the doctor approves a conservative approach, a TAGMED evaluation can help document the response obtained, function, route, and mechanical factors. Motorized decompression is only suggested when the profile seems compatible, without guarantee and without delaying necessary medical referral.
Dr. Sylvain Desforges, B.Sc., D.O., N.D., osteopath
Editorial information, sources and limitations
This content is intended to inform patients about sciatica, possible causes, warning signs, and care options. It does not replace an individualized assessment.
Reference sources
References are selected according to the subject of the page: guidelines, systematic reviews, then institutional resources.
- NICE NG59 – Low back pain and sciatica in over 16s — National guideline
- HAS – Management of patients with common low back pain — French national guideline
- Cochrane – Corticosteroid injections for treatment of sciatica — Systematic review
- NCBI Bookshelf – Sciatica — Clinical institutional resource
Complementary resources from the TAGMED network
These internal resources complement the clinical information and thematic linking. They do not replace national guidelines or systematic reviews.
Editorial note on decompression
Clinical resource from the TAGMED network; it does not replace national guidelines. Some guidelines use the term “traction” and recommend caution for low back pain with or without sciatica. Any decompression option should therefore be presented as an individualized clinical approach, with limitations, indications, and contraindications clearly explained.
Editorial note on imaging
Imaging is mainly considered when the presentation is complicated, prolonged, or likely to change management. Routine imaging is generally not necessary for every simple and recent sciatica-like pain presentation.
Limitations of this information
The information on this page is general. It does not constitute a diagnosis, prescription, or guarantee of results. Pain radiating into the leg may have several causes; assessment should consider clinical history, examination findings, symptom progression, and, when appropriate, complementary tests.
When to seek urgent medical care
Seek urgent medical care if you experience loss of bladder or bowel control, saddle anesthesia, major or progressive leg weakness, unexplained fever, pain after significant trauma, or severe pain that rapidly worsens.
