Epidural Steroid Injections for Spine Pain

An epidural steroid injection is a nonsurgical treatment that places anti-inflammatory medication near irritated spinal nerves, most often to reduce arm or leg pain from a disc herniation or spinal stenosis.

A disc herniation means the soft inner part of a spinal disc pushes through the outer wall. A spinal disc is the cushion between the bones of your spine. Spinal stenosis means narrowing around the nerves.

The goal is not to “fix” the MRI. It is to calm an irritated nerve. In my practice I treat an epidural injection as a tool: it may reduce nerve pain enough to let time, therapy, or natural healing do their work. It is not a cure for a herniated disc, arthritis, or stenosis.

This article is educational and cannot tell you whether to have an injection. Your individual risk depends on your symptoms, exam, MRI findings, medications, and health history.

Seek urgent medical care now for new loss of bladder or bowel control, groin or saddle numbness, rapidly worsening leg weakness, severe trouble walking, fever with severe back pain, new neurologic symptoms after an injection, or signs of spinal cord compression such as worsening hand clumsiness, balance problems, or weakness in the arms or legs. An epidural steroid injection is not emergency treatment for these situations.

What an epidural steroid injection is

An epidural steroid injection, or ESI, places medicine into the epidural space — the space around the spinal nerves, not into the spinal cord. The medicine usually includes:

• A corticosteroid, a strong anti-inflammatory medicine.
• A local anesthetic, numbing medicine that may give short-term relief.

It reduces swelling around an irritated nerve root, the part of a spinal nerve as it leaves the spine.

ESIs are most often used for radiating pain, which travels from the spine into another area:

• Low back pain that travels into the buttock, thigh, calf, or foot.
• Neck pain that travels into the shoulder, arm, or hand.
• Nerve-related symptoms such as burning, tingling, or electric pain.

What these injections are used for

Disc Herniation and Sciatica

A lumbar disc herniation is a herniated disc in the lower back that can irritate or press on a nerve root. When that nerve pain travels down the leg, it is often called sciatica — pain following the path of the sciatic nerve, usually from the low back or buttock into the leg.

An injection may reduce inflammation around the irritated nerve. Relief may be short-term, but for some people it is enough to get through the most painful phase while the disc improves with time.

Learn more: Lumbar Disc Herniation: A Surgeon’s Patient Guide and Sciatica: Causes, Diagnosis, and the Treatment Path.

Lumbar Spinal Stenosis

Lumbar spinal stenosis means narrowing around the nerves in the lower back. An injection may calm inflammatory irritation around crowded nerves, but it does not permanently enlarge the spinal canal, the tunnel that holds the nerves. Results vary, and injections are less predictable when stenosis is severe, long-lasting, or mainly from fixed bony narrowing.

Learn more: Lumbar Spinal Stenosis: A Plain-Language Guide for Patients.

Cervical Nerve Pain

Cervical means neck. Cervical injections may be used for arm pain from a cervical disc herniation or foraminal narrowing — narrowing of the small side opening where a nerve exits the spine. This nerve pain is called cervical radiculopathy: pain, numbness, tingling, or weakness from an irritated or compressed spinal nerve. Neck injections require careful technique, as the anatomy is more delicate than in the lower back.

Cervical radiculopathy must be separated from cervical myelopathy, which is pressure on the spinal cord in the neck. Myelopathy can cause balance trouble, hand clumsiness, weakness, or bowel or bladder changes, and it is not managed as routine injection planning.

Learn more: Cervical Disc Herniation: What It Is, How It’s Diagnosed, How It’s Treated and Cervical Spinal Stenosis & Cervical Myelopathy.

When an injection is less likely to help

Injections are more predictable for radiating arm or leg pain than for isolated back pain. They are often less helpful for:

• Isolated axial low back pain — pain mainly in the back, not traveling down the leg.
• Muscle strain.
• Generalized degenerative disc disease, meaning age-related wear in the spinal discs.
• MRI findings that do not match your pain location, side, or nerve pattern.

In my practice, a finding matters most when it explains the patient’s nerve symptoms.

Learn more: Degenerative Disc Disease — Lumbar.

How the injection works

The steroid is meant to reduce inflammation. The numbing medicine may give faster relief but can wear off within hours. The target is usually chosen from your symptoms, physical exam, and imaging.

An MRI (magnetic resonance imaging) uses magnets to make detailed pictures of the spine. Many injections are done with fluoroscopy, live X-ray guidance that helps the physician steer the needle. Contrast dye, a liquid that shows up on X-ray, may be used to confirm where the medication spreads; it is avoided in some people with allergies or other risks.

The key question is whether the MRI finding matches your symptoms. A disc herniation at L5-S1 — the level between the lowest lumbar bone and the top of the sacrum (the bone at the back of the pelvis) — fits pain running down the back of the leg into the foot only if the level, side, and nerve pattern line up.

Types of injection

No single approach is always best; the choice depends on your anatomy, symptoms, MRI findings, and the physician’s judgment.

Transforaminal

A transforaminal injection places medicine near a specific nerve root as it exits the spine, with the needle passing through or near the foramen (the small side opening where a nerve leaves). It is often chosen when one nerve appears to be the main pain source, such as in sciatica or foraminal stenosis.

Interlaminar

An interlaminar injection places medicine into the epidural space from the back of the spine, between the laminae (parts of the back of the spinal bones). It may be used when symptoms are broader or when central canal stenosis is involved. Central canal stenosis means narrowing in the main spinal canal.

Caudal

A caudal injection enters through the sacral canal, a tunnel in the sacrum near the tailbone. It may be used in certain lower back cases, or when prior surgery has changed the usual anatomy.

What to expect during the procedure

An ESI is usually an outpatient procedure, so you typically go home the same day. Details vary by clinic, but the steps are often:

• You lie on a procedure table.
• The skin is cleaned and numbed.
• The needle is guided with imaging, and contrast dye may be used if appropriate.
• The medicine is injected.
• You are monitored for a short time afterward.

You may feel pressure or brief discomfort during the injection, which varies with the injection type, your anatomy, and whether sedation is used. If local anesthetic is used, some people feel temporary numbness or weakness that usually wears off, though the timing varies. You may need a driver depending on sedation (medicine to relax you or make you sleepy), the injection type, and clinic policy, and your injection team should give you specific pre- and post-procedure instructions.

How long it takes to work

Relief comes in stages. The numbing medicine may help within hours and then wear off the same day. The steroid effect usually takes longer — several days, and in some cases 1 to 2 weeks.

Relief may last days, weeks, or months, or may not happen in a meaningful way. A good response is a clue that the targeted nerve is part of the problem, though it is not a perfect test. A poor response is also useful information, and does not automatically mean surgery is required.

How often you can have them

There is no universal number. Many clinicians limit steroid injections over a set period, because repeated steroid exposure can affect blood sugar, bone health, infection risk, and other body systems. How often injections are considered depends on:

• The diagnosis.
• How much the last injection helped, and how long the relief lasted.
• The steroid dose.
• Diabetes.
• Osteoporosis risk (risk of weak bones).
• Infection risk.
• Use of blood thinners.
• Prior spine surgery.
• Other health factors.

In my practice the question is not just “Can we do another injection?” but “Did the last one give enough meaningful relief to justify repeating it, and does the diagnosis still make sense?” I am much more cautious about repeating an injection that gave no meaningful relief; a repeat makes more sense when the first clearly helped and the symptoms still match the target.

Risks and side effects

Most people do not have serious complications, but ESIs are not risk-free. Corticosteroids are commonly used for these injections, and the U.S. Food and Drug Administration has warned about rare serious neurologic events (relating to the brain, spinal cord, or nerves) after epidural corticosteroid injections.

Common or temporary side effects

• Soreness at the injection site.
• A short pain flare.
• Facial flushing (warmth or redness in the face).
• Headache.
• Sleep disturbance.
• Temporary blood sugar elevation, especially in people with diabetes.
• Temporary numbness or weakness from local anesthetic.

If you have diabetes, blood sugar may rise for a short time, and your care plan may need special attention around the procedure.

Less common but more serious risks

• Infection.
• Bleeding.
• Epidural hematoma — a blood collection in the epidural space that can press on nerves.
• Dural puncture — a needle punctures the covering around the spinal fluid.
• Spinal headache, which can follow a dural puncture and is often worse when sitting or standing.
• Nerve injury.
• Allergic reaction.
• Rare serious neurologic complications.

Rare severe complications have been reported, including spinal cord injury, stroke, paralysis, and death. These are uncommon but important to understand before the procedure.

Risk factors to discuss beforehand

Your medical history changes the risk-benefit balance. Important factors include:

• Blood thinners or antiplatelet medicines.
• Diabetes.
• Immune suppression (a weaker immune system).
• Active infection.
• Pregnancy.
• Contrast allergy.
• Prior spine surgery.
• Osteoporosis or fracture risk.
• Prior bad reaction to steroid or anesthetic medicine.

If you take a blood thinner, do not stop it on your own — the injection team and the prescribing clinician need to plan it safely. Discuss all of these individual risks with your treating physician.

Can an injection help you avoid surgery?

Sometimes an injection settles symptoms enough that surgery is not needed, or gives temporary relief while the body heals and you start physical therapy. Sometimes symptoms return, and sometimes the injection does not help. It is a tool that may calm the nerve, not a cure for stenosis or a disc herniation.

Surgery may still be considered when there is:

• Persistent disabling nerve pain despite appropriate nonsurgical care.
• Progressive neurologic deficit, such as worsening weakness.
• Severe compression that matches disabling symptoms and does not improve.
• Cervical myelopathy.
• Cauda equina symptoms.

Cauda equina syndrome is a rare emergency in which the nerves at the bottom of the spinal canal are severely compressed, causing bladder or bowel changes, saddle numbness, and leg weakness.

For surgery-related reading, see:

• Microdiscectomy: What Happens, Recovery, and Outcomes
• Lumbar Laminectomy: When Decompression Alone Is Enough
• ACDF: Anterior Cervical Discectomy and Fusion
• Cervical Artificial Disc Replacement

An injection is not a substitute for urgent care when red flags are present.

The key question: do your symptoms match your MRI?

MRI abnormalities are common, especially with age — many people have disc bulges, degeneration, or arthritis on MRI without any spine pain. So the report alone should not drive the decision. What matters is whether a finding matches the side, level, and pattern of the patient’s symptoms, not just how dramatic it sounds. For example:

• MRI: right L5-S1 disc herniation touching the right S1 nerve.
• Symptoms: right-sided pain down the back of the leg into the calf or foot.

That match is far more convincing than a left-sided finding when all the pain is on the right. When an MRI shows several abnormalities, the hardest part is deciding which one is actually causing the symptoms — which is where the pain pattern and neurologic exam become critical. A neurologic exam checks nerve function through strength, reflexes, sensation, walking, and balance. When findings are multiple or vague, an injection can sometimes give diagnostic clues, but it should not be treated as a perfect test.

When an injection may not be enough

An injection may not be enough when serious or progressive nerve problems appear — progressive weakness, cervical myelopathy, cauda equina symptoms, or structural compression that keeps causing disabling symptoms despite appropriate nonsurgical care. Seek urgent medical care now for new bladder or bowel loss, saddle numbness, rapidly worsening weakness, severe trouble walking, fever with severe back pain, or new neurologic symptoms after an injection.

Learn more: Cauda Equina Syndrome: The Spine Emergency Patients Need to Recognize and Cervical Spinal Stenosis & Cervical Myelopathy.

Questions to ask before an injection

Before an injection, it is reasonable to ask:

• What diagnosis is the injection treating?
• Which nerve or level is being targeted?
• Does my pain pattern match the MRI finding?
• What type of epidural injection are you recommending, and why?
• What are the realistic goals: less pain, better function, avoiding surgery, or diagnostic information?
• How will we judge whether it worked?
• What happens if it does not help?
• Are there special risks because of my medications or health conditions?
• How many injections would be reasonable in my case?

Frequently Asked Questions

Is an ESI the same as a cortisone shot?

Similar, but more specific. “Cortisone shot” is a general term for a steroid injection; an ESI places steroid into the epidural space around spinal nerves, not into a shoulder, knee, or muscle.

What if the injection does not work?

A poor response does not automatically mean surgery is needed. It may mean the target was not the main pain source, the compression is too severe, the inflammation is not steroid-responsive, or another pain source is involved. Next steps depend on the full picture.

Can I have an injection if I have diabetes?

Diabetes does not always rule out an ESI, but steroid medicine can raise blood sugar for a short time. Tell the injection team beforehand; blood sugar monitoring and medication planning may need special attention.

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References

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