An Epidural Steroid Injection (ESI) is a minimally invasive procedure that delivers anti-inflammatory medication into the epidural space around spinal nerves. It is mainly considered for selected people with nerve-related symptoms such as sciatica or cervical or lumbar radicular pain not as a routine treatment for every type of neck or lower-back pain.
The purpose is usually to reduce inflammation and irritation around a spinal nerve root so that pain decreases enough to improve walking, sleep, daily activity or participation in rehabilitation. Relief varies significantly between patients and may be temporary. Current evidence supports mainly short-term benefit in appropriately selected radiculopathy, while long-term pain relief remains less certain.
This article explains what the injection actually does, who may benefit, how it is performed, realistic results, safety considerations and what to discuss with a pain specialist.
What Is an Epidural Steroid Injection?
An Epidural Steroid Injection places medication into the epidural space, an area within the spinal canal surrounding the spinal cord and spinal nerve structures.
The medicine typically includes a corticosteroid intended to reduce inflammation. Depending on the clinical plan, a local anaesthetic may also be used.
The medication is not intentionally injected into the spinal cord itself.
RadiologyInfo, a patient-information resource developed by the Radiological Society of North America and American College of Radiology, describes epidural injection as medication delivered into the epidural space to reduce pain and inflammation around spinal nerve roots. Imaging such as fluoroscopy or CT may be used to guide accurate needle placement.
An ESI is therefore better understood as a targeted anti-inflammatory pain procedure, not simply “a strong painkiller injection.”
How Does an Epidural Steroid Injection Work?
A spinal nerve root can become irritated by inflammation or pressure associated with conditions such as a herniated disc.
When this happens, pain may travel along the nerve pathway rather than remain only in the back or neck.
Symptoms can include:
- shooting pain into a leg or arm,
- burning or electric-like pain,
- tingling,
- numbness,
- pain worsened by certain spinal movements,
- sometimes weakness.
Corticosteroids have anti-inflammatory effects. When placed near an irritated nerve root, the aim is to decrease inflammation around that nerve.
Reducing inflammation does not necessarily remove the underlying disc or reverse every structural spinal change.
That distinction matters.
An epidural injection primarily aims to control symptoms and inflammation. It is not a procedure that mechanically repairs a damaged disc.
If pain improves, the resulting window of better movement may allow a person to participate more comfortably in physiotherapy, strengthening and normal activity.
Karuna City Clinic’s approach to interventional pain management similarly emphasizes using procedures within a broader plan involving diagnosis, rehabilitation and functional recovery rather than viewing injections as stand-alone cures.
What Conditions May an Epidural Steroid Injection Help?
An ESI is most logically considered when symptoms suggest spinal nerve-root irritation or radicular pain.
Examples can include selected cases of:
- lumbar radiculopathy,
- sciatica,
- cervical radiculopathy,
- disc herniation affecting a nerve root,
- radiating leg pain,
- radiating arm pain,
- some spinal stenosis presentations.
RadiologyInfo lists herniated or bulging discs, spinal stenosis and other causes of spinal nerve irritation among conditions in which epidural injections may sometimes be used.
However, “may be used” does not mean “is appropriate for everyone.”
The 2025 systematic review prepared by the American Academy of Neurology Guidelines Subcommittee found that epidural steroid injections probably reduce short-term pain and disability in cervical and lumbar radiculopathy, while evidence for long-term pain reduction remains insufficient. Benefit for lumbar spinal stenosis is less clear, particularly for pain outcomes.
That is why diagnosis should come before procedural selection.
Is an Epidural Steroid Injection Good for Ordinary Lower-Back Pain?
Not automatically.
This is one of the most important distinctions for patients to understand.
Someone with pain only across the lower back is different from someone whose pain travels from the back or buttock down the leg because of nerve-root irritation.
NICE guidance advises against routine spinal injections for ordinary nonspecific low-back pain while recommending that an epidural containing local anaesthetic and steroid may be considered for acute and severe sciatica in selected patients.
Karuna City Clinic’s own low-back-pain guidance makes the same distinction: an epidural is not a general injection for every painful back.
Back Pain vs Radicular Pain
| Symptom Pattern | ESI Relevance |
| Localised back ache without nerve symptoms | Usually not a reason by itself |
| Pain travelling from lower back into the leg | May warrant evaluation for radicular pain |
| Burning or electric pain down a leg | May suggest nerve involvement |
| Arm pain coming from the neck | May warrant assessment for cervical radiculopathy |
| Severe sciatica | ESI may be considered in selected patients |
| Back pain with progressive weakness or bladder/bowel problems | Requires urgent evaluation rather than routine injection planning |
The practical question is therefore not:
“Do I have back pain?”
It is:
“Is an irritated spinal nerve root actually contributing to my symptoms?”
How Do Doctors Decide Whether an ESI Is Appropriate?
The decision should begin with a diagnosis-focused assessment.
A pain specialist may evaluate:
- where the pain begins,
- where it travels,
- whether pain is burning, electric, aching or stabbing,
- numbness or tingling,
- muscle weakness,
- reflexes,
- movement limitations,
- previous injuries,
- duration of symptoms,
- previous physiotherapy,
- medicines already tried,
- earlier injections,
- relevant MRI or other imaging,
- medical conditions that influence procedure safety.
A scan is only one part of that process.
A disc bulge visible on an MRI does not automatically prove that the disc is causing the patient’s symptoms. The history, examination and imaging findings should make sense together.
Karuna City Clinic’s guide on how pain specialists identify the source of pain describes this process as combining symptom distribution, examination findings, previous treatment and selective investigations rather than relying on one scan alone.
Is an Epidural Steroid Injection the Same as an Epidural During Childbirth?
No.
Both procedures involve the epidural space, but their purpose and medication strategy are different.
Epidural anaesthesia during labour is used to block pain signals over a region of the body and commonly involves delivery of local anaesthetic and other analgesic medicines.
An Epidural Steroid Injection for spinal pain is intended primarily to place anti-inflammatory medication near irritated spinal nerves.
The two procedures should therefore not be treated as interchangeable simply because both are called “epidurals.”
What Are the Different Types of Epidural Steroid Injection?
Doctors can reach the epidural space through different anatomical approaches.
Common approaches include:
Transforaminal Epidural Injection
The medication is directed toward a specific spinal nerve-root region through the opening where the nerve exits the spine.
This may be selected when symptoms and imaging point toward a particular affected nerve.
Interlaminar Epidural Injection
The needle reaches the epidural space through the area between adjacent vertebral structures.
Medication can spread within the epidural space around nearby nerve roots.
Caudal Epidural Injection
The epidural space is approached through the lower sacral region.
It may be selected in particular lower-spine circumstances.
There is no single approach that is automatically best for every patient.
The choice depends on:
- spinal level,
- suspected nerve root,
- anatomy,
- previous surgery,
- imaging,
- procedural risk,
- clinical objective,
- specialist judgment.
The 2025 AAN systematic review found substantial variability in the ESI evidence and did not establish one universally superior technique for all relevant outcomes and conditions.
What Happens During an Epidural Steroid Injection?
The exact protocol varies between facilities and approaches, but a typical image-guided procedure follows several stages.
1. Confirming the Procedure
The clinical team confirms:
- patient identity,
- intended spinal region,
- symptoms and diagnosis,
- allergies,
- medication history,
- relevant imaging,
- safety information.
2. Positioning
The patient is commonly positioned on the stomach or side, depending on the procedure and imaging equipment.
3. Skin Preparation
The skin is cleaned using antiseptic preparation.
A local anaesthetic may be used to numb the skin and superficial tissues.
4. Imaging Guidance
Fluoroscopy—real-time X-ray—or CT may be used to guide needle placement.
Imaging helps the clinician position the needle accurately in relation to the intended spinal target.
5. Confirming Needle Position
Depending on the technique, contrast material may be used under imaging to check how the injected material spreads before therapeutic medication is delivered.
6. Medication Injection
The medication is then administered into the targeted epidural region.
A patient may notice:
- pressure,
- tingling,
- temporary reproduction of familiar symptoms,
- mild discomfort.
Unexpected severe pain or another unusual symptom should be communicated to the procedural team immediately.
7. Observation
Afterward, the patient is generally observed for an appropriate period before discharge.
ESIs are commonly outpatient procedures, although the exact setting and observation requirements depend on the patient’s health and procedure.
Is an Epidural Steroid Injection Painful?
Patients usually feel some degree of sensation during needle placement.
A local anaesthetic is commonly used to numb the area. People may describe pressure, tingling, temporary discomfort or a brief reproduction of their usual nerve symptoms.
Experiences vary substantially.
An ESI should therefore not be advertised as either completely painless or inherently extremely painful.
If severe or unexpected pain occurs during the procedure, the clinician should be informed immediately.
How Should You Prepare for an Epidural Injection?
Preparation should follow the instructions of the treating team rather than generic internet advice.
Tell the clinician about:
- prescription medicines,
- over-the-counter medicines,
- anticoagulants or antiplatelet medicines,
- diabetes medicines,
- other steroid treatment,
- allergies,
- previous reactions to contrast,
- infection or fever,
- pregnancy or possible pregnancy,
- previous spinal procedures,
- previous injections and their results.
Blood-Thinning Medicines
Blood-thinning medication is particularly important because spinal procedures can carry bleeding risk.
Do not stop anticoagulant or antiplatelet medication on your own.
ASRA Pain Medicine guidance treats epidural steroid injections as procedures requiring specific assessment of bleeding and anticoagulation risk. Decisions about interruption of blood-thinning medicines depend on the medicine, procedure and individual thrombotic risk.
Diabetes
Injected corticosteroids can affect blood-glucose control in some patients.
Tell the treating team if you have diabetes so appropriate planning and follow-up can be considered.
Infection
An elective spinal injection may need to be postponed if active infection creates an unacceptable procedural risk.
Pregnancy
If fluoroscopy or CT is planned, tell the healthcare team if pregnancy is possible because these techniques involve ionizing radiation.
Karuna City Clinic’s broader guide to pain-injection safety also emphasizes medication review, infection history, diabetes, pregnancy possibility, allergies and bleeding risk before a procedure.
How Effective Is an Epidural Steroid Injection?
The most accurate answer is:
It can help selected patients, particularly in the short term, but it does not work equally well for everyone.
A major 2025 systematic review by the American Academy of Neurology Guidelines Subcommittee evaluated randomized trials of ESIs for cervical and lumbar radiculopathy and spinal stenosis.
For cervical and lumbar radiculopathy, the review concluded that ESIs probably reduce short-term pain and disability. Evidence was insufficient to establish meaningful long-term pain reduction.
For lumbar spinal stenosis, benefit appears less certain. The review found possible improvement in disability but did not establish clear short-term pain benefit, and long-term pain evidence remained insufficient.
This supports a realistic expectation:
An ESI is usually better viewed as a potential period of symptom improvement than as a guaranteed permanent cure.
How Long Does an Epidural Steroid Injection Last?
There is no single duration that applies to everyone.
Some people experience:
- little or no meaningful benefit,
- relief lasting days,
- improvement lasting weeks,
- improvement lasting several months.
RadiologyInfo notes that duration varies considerably and that effects may last from days to months in some patients.
The outcome depends on factors such as:
- underlying diagnosis,
- severity of nerve irritation,
- duration of symptoms,
- anatomical changes,
- injection target,
- response to rehabilitation,
- previous surgery,
- individual biology.
The key outcome should not be only “How many weeks did the injection last?”
Also consider:
- Could you walk farther?
- Could you sleep better?
- Could you sit through work?
- Did radiating pain decrease?
- Were you able to restart physiotherapy?
- Did function meaningfully improve?
How Quickly Does an ESI Start Working?
Improvement is not always immediate.
When local anaesthetic is included, temporary relief or numbness may occur relatively quickly. That effect can wear off before the steroid component has had time to produce its intended anti-inflammatory effect.
RadiologyInfo notes that improvement may develop progressively over the first couple of days rather than immediately.
A brief increase in discomfort can also occur after some injections.
Follow the treating team’s instructions about what is expected and which symptoms require reassessment.
Can an Epidural Steroid Injection Permanently Cure Sciatica?
Not necessarily.
Sciatica is a symptom pattern associated with irritation or compression involving spinal nerve roots.
An ESI may reduce inflammatory irritation around the nerve, but it does not automatically:
- remove a large disc herniation,
- reverse severe structural stenosis,
- repair spinal instability,
- restore permanent nerve damage,
- eliminate every contributor to pain.
Some disc-related symptoms improve naturally over time with appropriate nonsurgical management. Other patients may continue to experience symptoms despite injections and rehabilitation.
A smaller group may need surgical assessment when significant neurological compression or persistent disabling symptoms make surgery appropriate.
The ESI should therefore be viewed as one possible component of treatment, not a promise to avoid surgery.
What Are the Risks of Epidural Steroid Injections?
No invasive spinal procedure is completely risk-free.
Potential complications include:
- temporary soreness,
- temporary increase in pain,
- flushing or steroid-related symptoms,
- temporary numbness or weakness,
- blood-glucose changes,
- bleeding,
- infection,
- allergic reaction,
- dural puncture and headache,
- nerve injury,
- complications related to unintended medication placement.
Rare but Serious Neurological Complications
Serious neurological complications are uncommon but important enough to discuss during informed consent.
The U.S. Food and Drug Administration has required warnings concerning rare serious neurological events reported after epidural corticosteroid injections. Reported events include spinal cord infarction, paralysis, stroke and visual loss.
A regulatory nuance is also important: in the United States, corticosteroids commonly used for these injections are not FDA-approved specifically for epidural administration. Their epidural use is therefore off-label in the U.S. regulatory context.
This does not mean that every ESI is unsafe or prohibited. It means patients should receive clear information about:
- why the procedure is recommended,
- expected benefit,
- alternatives,
- medicine selection,
- technique,
- risks,
- what evidence supports the decision.
Regulatory approvals and clinical practice standards can differ between countries, so U.S. FDA status should not be interpreted as a statement about Nepal’s regulatory system.
Who May Need to Avoid or Postpone an ESI?
The procedure may need to be postponed, modified or avoided in situations such as:
- active infection,
- unacceptable bleeding risk,
- certain anticoagulant circumstances,
- significant medication allergy,
- poorly controlled medical illness,
- pregnancy when imaging-related radiation requires reconsideration,
- absence of a reasonable spinal target,
- repeated injections without meaningful previous benefit.
Another important group is people with progressive neurological emergencies.
An injection should not delay urgent evaluation of major nerve compression.
What Symptoms Require Urgent Medical Attention Instead?
Seek urgent medical evaluation for back or neck pain associated with symptoms such as:
- new loss of bladder control,
- new loss of bowel control,
- numbness around the groin or inner thighs,
- rapidly worsening leg weakness,
- paralysis,
- severe symptoms after major trauma,
- fever with severe spinal pain,
- significant neurological deterioration.
Karuna City Clinic’s current pain guidance specifically identifies bladder or bowel changes, perineal numbness and progressive weakness as warning signs requiring urgent assessment rather than a routine pain appointment.
These symptoms can indicate conditions in which rapid diagnosis is more important than scheduling an elective injection.
What Happens After an Epidural Steroid Injection?
After an ESI, follow the specific discharge instructions from the treating team.
Depending on the procedure, patients may be advised about:
- driving,
- activity,
- exercise,
- wound care,
- bathing,
- medications,
- return to work,
- follow-up.
Temporary numbness or heaviness may occur when local anaesthetic has been used.
RadiologyInfo advises patients to plan transportation home and notes that temporary walking difficulty can occur because of numbness or discomfort.
Track Function, Not Only Pain
A useful follow-up record can include:
- pain before and after treatment,
- leg or arm symptoms,
- sitting tolerance,
- walking distance,
- sleep quality,
- medicine use,
- ability to exercise,
- return to work,
- ability to participate in physiotherapy.
This gives the clinician more useful information than simply saying:
“It helped a little.”
Should Physiotherapy Continue After an ESI?
In many cases, the injection and rehabilitation should be viewed as complementary rather than competing treatments.
If pain decreases enough, the person may be better able to work on:
- spinal mobility,
- strength,
- graded activity,
- movement confidence,
- endurance,
- return to normal tasks.
Karuna City Clinic’s interventional-pain framework similarly states that procedures should support rehabilitation rather than replace comprehensive care.
A successful injection is therefore not necessarily the end of treatment.
It may create an opportunity to make rehabilitation more effective.
ESI vs Other Back-Pain Treatments
| Treatment | Main Role | Key Limitation |
| Education/activity guidance | Supports recovery and self-management | Does not address every severe nerve condition |
| Physiotherapy/rehabilitation | Builds movement and physical capacity | Requires appropriate diagnosis and participation |
| Medication | Helps control selected symptoms | Side effects and suitability vary |
| Epidural Steroid Injection | Targets selected nerve-root inflammation | Benefit may be temporary or absent |
| Surgery | Can directly address selected structural compression | More invasive and not needed by everyone |
These are not always competing options.
A patient may use several components at different stages of treatment.
The right sequence depends on diagnosis, symptom severity, neurological findings, previous treatment and functional limitations.
How Many Epidural Steroid Injections Can You Have?
There is no responsible universal answer such as:
“Everyone should have three injections.”
Repeat treatment should depend on:
- response to the previous injection,
- duration of benefit,
- functional improvement,
- steroid exposure,
- adverse effects,
- medical conditions,
- diagnosis,
- availability of better alternatives.
Karuna City Clinic’s current injection-safety guidance similarly states that there is no universal schedule that applies to every pain procedure and that repeat treatment should have a clear clinical reason.
Repeated procedures that provide no meaningful benefit should prompt reassessment rather than automatic continuation.
Questions to Ask Before an Epidural Steroid Injection
Before deciding, consider asking the procedural specialist:
- What is my working diagnosis?
- Which nerve or spinal level appears to be involved?
- Why might an epidural help my specific symptoms?
- Why is this procedure preferable to continuing conservative treatment?
- Which epidural approach is being considered?
- Will imaging guidance be used?
- What medicine will be injected?
- What improvement would count as a successful result?
- How long could benefit realistically last?
- What are my personal risks?
- What should I do about blood-thinning or diabetes medicine?
- What alternatives are available?
- What happens if the injection does not help?
- When should rehabilitation resume?
- Which symptoms afterward require urgent care?
These questions turn the decision from:
“Should I get an injection?”
into the more useful question:
“Is this particular procedure appropriate for this particular diagnosis?”
Epidural Steroid Injection and Interventional Pain Management in Kathmandu
Choosing an injection should begin with assessment—not with selecting a procedure from a menu.
Karuna City Clinic describes its approach to pain as diagnosis-focused and multidisciplinary. Its website lists anaesthesiology, orthopaedics, radiology, diagnostic services and broader interventional-pain pathways.
Its listed consultant anaesthesiologist is Dr. Ashis Ratna Bajracharya, MBBS, MD Anaesthesiology, NMC No. 7807.
Patients with persistent back pain, sciatica, radiating arm or leg pain, numbness or other possible nerve-related symptoms can begin with a structured clinical assessment.
The objective should be to determine:
- the likely pain source,
- whether an injection is appropriate,
- whether further imaging is needed,
- whether conservative treatment should continue,
- whether another intervention or referral is preferable.
For a broader overview, read Karuna City Clinic’s guide to interventional pain management in Nepal.
Key Takeaways
- An Epidural Steroid Injection delivers anti-inflammatory medication into the epidural space around spinal nerves.
- It is mainly used for selected nerve-root-related pain—not routine nonspecific back pain.
- Evidence is strongest for short-term improvement in selected cervical and lumbar radiculopathy.
- Relief varies and may be temporary or absent.
- The injection does not mechanically repair a disc.
- Image guidance may be used to improve needle placement accuracy.
- Important risks include bleeding, infection, dural puncture, medication effects and rare neurological complications.
- Diagnosis, patient selection and rehabilitation are as important as the procedure itself.
- Progressive weakness, saddle-area numbness or bladder/bowel dysfunction requires urgent medical assessment rather than routine injection planning.