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 caused by conditions such as 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 main goal of an epidural steroid injection is not to “fix” the MRI. It is to calm an irritated nerve.

In my practice, I think of 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. It cannot determine whether you should receive an injection. Your individual risk depends on your symptoms, exam, MRI findings, medications, and health history.

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

What Is an Epidural Steroid Injection?

An epidural steroid injection, often called an ESI, places medicine into the epidural space. This is the space around the spinal nerves. It is not an injection into the spinal cord.

The medicine usually includes:

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

The goal is to reduce swelling and inflammation around an irritated nerve root. A nerve root is the part of a spinal nerve as it leaves the spine.

Epidural steroid injections are most often used for radiating pain. Radiating pain travels from the spine into another area, such as:

• 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.

An epidural steroid injection does not remove a disc herniation or reverse arthritis. It tries to calm the inflammation around a nerve so the pain can settle enough for healing, therapy, or time to help.

What Problems Are Epidural Steroid Injections Used For?

Disc Herniation and Sciatica

A lumbar disc herniation is a herniated disc in the lower back. It can irritate or press on a nerve root.

When that nerve pain travels down the leg, it is often called sciatica. Sciatica means pain that follows the path of the sciatic nerve, usually from the low back or buttock into the leg.

An epidural steroid injection may reduce inflammation around the irritated nerve. Relief may be short-term. For some people, it can be enough to get through the most painful phase while the disc problem 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 reduce inflammatory irritation around crowded nerves. But it does not permanently enlarge the spinal canal. The spinal canal is the tunnel in the spine that holds the nerves.

Results can vary. Injections may be less predictable when stenosis is severe, long-lasting, or mainly caused by fixed bony narrowing.

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

Cervical Nerve Pain

Cervical means neck. Cervical epidural steroid injections may be used for arm pain caused by a cervical disc herniation or foraminal narrowing. Foraminal narrowing means narrowing of the small side opening where a nerve exits the spine.

This type of nerve pain is called cervical radiculopathy. Radiculopathy means pain, numbness, tingling, or weakness caused by an irritated or compressed spinal nerve.

Neck injections require careful technique. The anatomy is more delicate than in the lower back.

It is also important to separate cervical radiculopathy from cervical myelopathy. Cervical myelopathy means pressure on the spinal cord in the neck. It can cause balance trouble, hand clumsiness, weakness, or changes in bowel or bladder function. Myelopathy is not treated 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 ESI Is Less Likely to Help

Epidural steroid injections tend to be more predictable for radiating arm or leg pain than for isolated back pain.

They are often less helpful for:

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

In my practice, the finding matters most when it explains the patient’s nerve symptoms. Epidural injections tend to be more predictable for radiating arm or leg pain than for isolated back pain.

Learn more: Degenerative Disc Disease — Lumbar.

How an Epidural Steroid Injection Works

The steroid part of the injection is meant to reduce inflammation. The numbing medicine may give faster relief, but it can wear off within hours.

The injection target is usually chosen by looking at:

• Your symptoms.
• Your physical exam.
• Your MRI or other imaging.

An MRI, or magnetic resonance imaging scan, uses magnets to make detailed pictures of the spine.

Many epidural injections are done with fluoroscopy. Fluoroscopy is live X-ray guidance. It helps the physician guide the needle.

Contrast dye may also be used. Contrast dye is a liquid that shows up on X-ray. It can help confirm where the medication spreads. It may not be used in some people with certain allergies or other risks.

The key question is whether the MRI finding matches your symptoms.

For example:

• MRI finding: “Disc herniation at L5-S1.”
• Symptom pattern: “Pain down the back of the leg into the foot.”

L5-S1 is the level between the lowest lumbar bone and the top of the sacrum. The sacrum is the bone at the back of the pelvis.

The treatment decision depends on whether the level, side, and nerve pattern fit together.

Types of Epidural Steroid Injections

There are several ways to place medicine into the epidural space. One type is not always better than another. The approach depends on your anatomy, symptoms, MRI findings, and the physician’s judgment.

Transforaminal Epidural Steroid Injection

A transforaminal epidural steroid injection places medicine near a specific nerve root as it exits the spine.

“Transforaminal” means the needle path goes through or near the foramen. The foramen is the small side opening where a nerve leaves the spine.

This approach is often discussed when one nerve appears to be the main pain source. It is commonly used for sciatica or foraminal stenosis.

Interlaminar Epidural Steroid Injection

An interlaminar epidural steroid injection places medicine into the epidural space from the back of the spine.

“Interlaminar” means between the laminae. The laminae are parts of the back of the spinal bones.

This approach 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 Epidural Steroid Injection

A caudal epidural steroid injection enters through the sacral canal near the tailbone.

“Caudal” means from below. The sacral canal is a tunnel in the sacrum.

This approach may be used in certain lower back cases. It may also be considered when prior surgery has changed the usual anatomy.

What to Expect During the Procedure

An epidural steroid injection is usually an outpatient procedure. That means you usually go home the same day.

The exact process varies by clinic, but it often includes these steps:

• You lie on a procedure table.
• The skin is cleaned.
• The skin is numbed.
• The needle is guided with imaging.
• 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.

Some people feel temporary numbness or weakness if local anesthetic is used. This usually wears off, but the timing can vary.

You may need a driver depending on sedation, the type of injection, and clinic policy. Sedation means medicine used to relax you or make you sleepy.

Your injection team should give you specific instructions for that procedure.

How Long Does an Epidural Steroid Injection Take to Work?

Relief can happen in different stages.

The numbing medicine may help quickly. That relief may wear off the same day.

The steroid effect usually takes longer. It may take several days. In some cases, it can take 1 to 2 weeks.

Some people have temporary soreness or a short pain flare after the injection.

Relief can last:

• Days.
• Weeks.
• Months.
• Or not happen in a meaningful way.

A good response can provide a clue that the targeted nerve is part of the pain problem. But it is not a perfect test.

A poor response can also be useful information. It does not automatically mean surgery is required.

How Often Can You Get Epidural Steroid Injections?

There is no universal number that applies to every person.

Many clinicians limit the number of steroid injections over a set period. This is 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.
• How long the relief lasted.
• The steroid dose.
• Diabetes.
• Osteoporosis risk, which means 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?” It is “Did the last injection provide enough meaningful relief to justify repeating it, and does the diagnosis still make sense?”

I am much more cautious about repeating an injection if the first one gave no meaningful relief. A repeat may make more sense when the first injection clearly helped and the symptoms still match the target.

Risks and Side Effects of Epidural Steroid Injections

Most people do not have serious complications. But epidural steroid injections are not risk-free.

Also, corticosteroids are commonly used for epidural injections, but the U.S. Food and Drug Administration has warned about rare serious neurologic events after epidural corticosteroid injections. Neurologic means related to the brain, spinal cord, or nerves.

Common or Temporary Side Effects

Common or temporary side effects can include:

• Soreness at the injection site.
• A short pain flare.
• Facial flushing, which means 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 after the injection. Your diabetes care plan may need special attention around the procedure.

Less Common but More Serious Risks

Less common but more serious risks include:

• Infection.
• Bleeding.
• Epidural hematoma, which is a blood collection in the epidural space that can press on nerves.
• Dural puncture, which means a needle punctures the covering around the spinal fluid.
• Spinal headache, which can happen after 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 they are important to understand before the procedure.

Risk Factors to Discuss Before the Injection

Your medical history can change the risk-benefit balance.

Important factors include:

• Blood thinners or antiplatelet medicines.
• Diabetes.
• Immune suppression, which means 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 clinician who prescribes it need to plan safely.

Patients should discuss individual risks with their treating physician, especially if they take blood thinners, have diabetes, have infection risk, are pregnant, have contrast allergy, have osteoporosis risk, or have prior spine surgery.

Does an Epidural Steroid Injection Help Avoid Surgery?

Sometimes an epidural steroid injection helps symptoms settle enough that surgery is not needed.

Sometimes it gives temporary relief while the body heals or while you start physical therapy.

Sometimes symptoms return. Sometimes the injection does not help.

I do not think of an epidural injection as a cure for stenosis or a disc herniation. I think of it as a tool that may calm the nerve enough to let time, therapy, or natural healing do their work.

Surgery may still be considered when there is:

• Persistent disabling nerve pain.
• Progressive neurologic deficit, such as worsening weakness.
• Severe compression that matches the symptoms.
• Cervical myelopathy.
• Cauda equina symptoms.

Cauda equina syndrome is a rare emergency where the nerves at the bottom of the spinal canal are severely compressed. It can cause 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 epidural steroid injection is not a substitute for urgent care when red flags are present.

The Most Important Question: Do Your Symptoms Match Your MRI?

MRI abnormalities are common, especially with age. Many people have disc bulges, degeneration, or arthritis on MRI even when they do not have spine pain.

That is why the MRI report alone should not drive the decision.

What I look for on MRI is not just a dramatic-sounding finding. I look for whether the finding matches the side, level, and pattern of the patient’s symptoms.

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 more convincing than an MRI finding on the left side when all the pain is on the right.

When an MRI shows several abnormalities, the hardest part is often deciding which one is actually causing the symptoms. That is where the pain pattern and neurologic exam become critical.

A neurologic exam checks nerve function. It may include strength, reflexes, sensation, walking, and balance.

If MRI findings are multiple or vague, it may be harder to know which level to target. In that setting, an injection can sometimes give diagnostic clues. But it should not be treated as a perfect test.

When an Epidural Steroid Injection May Not Be Enough

An epidural steroid injection may not be enough when there are signs of serious or progressive nerve problems.

These include:

• Progressive weakness.
• Severe persistent nerve pain despite appropriate nonsurgical care.
• Signs of cervical myelopathy.
• Cauda equina symptoms.
• Structural compression that matches disabling symptoms and does not improve.

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 Getting an Epidural Steroid Injection

Before an injection, it is reasonable to ask clear questions.

Use this checklist:

• 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 considered reasonable in my case?

Frequently Asked Questions

Is an epidural steroid injection the same as a cortisone shot?

It is similar, but more specific.

“Cortisone shot” is a common term for a steroid injection. An epidural steroid injection places steroid medicine into the epidural space around spinal nerves. It is not the same as a steroid shot into a shoulder, knee, or muscle.

Does an epidural steroid injection fix a herniated disc?

No. It does not remove the herniated disc.

It may reduce inflammation around the irritated nerve. That can reduce pain while time, therapy, or natural healing helps.

How painful is an epidural steroid injection?

Most people feel pressure, pinching, or brief discomfort. The skin is usually numbed first.

Pain during the procedure varies by the injection type, anatomy, inflammation level, and whether sedation is used.

How long does relief from an epidural steroid injection last?

It varies. Relief may last days, weeks, or months. Some people get little or no meaningful relief.

The numbing medicine may help quickly and then wear off. The steroid effect may take several days and sometimes up to 1 to 2 weeks.

How many epidural steroid injections can you have in a year?

There is no single safe number for everyone.

Many clinicians limit steroid injections over time because repeated steroid exposure can matter. The right limit depends on the diagnosis, response, steroid dose, diabetes, bone health, infection risk, and other medical factors.

Can an epidural steroid injection make symptoms worse?

Yes, temporarily. Some people have soreness or a short pain flare.

Rarely, worsening symptoms can signal a serious problem. New weakness, new numbness that does not resolve, fever, severe headache, bladder or bowel changes, or severe escalating pain after an injection should be treated as urgent.

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. It may mean the compression is too severe, the inflammation is not steroid-responsive, or another pain source is involved. Next steps depend on the full picture.

Are epidural steroid injections safe for the neck?

Cervical epidural steroid injections can be appropriate in selected cases. But the neck anatomy is more delicate.

Careful technique, imaging guidance, and patient selection matter. Rare serious neurologic complications have been reported.

Can I get an epidural steroid injection if I have diabetes?

Diabetes does not always rule out an epidural steroid injection. But steroid medicine can raise blood sugar for a short time.

If you have diabetes, the injection team should know before the procedure. Blood sugar monitoring and medication planning may need special attention.

How do I know if my MRI finding is the right target for an injection?

The MRI finding is more likely to be the right target when it matches:

• The side of your pain.
• The path of your pain.
• Your numbness or weakness pattern.
• Your neurologic exam.
• The nerve level shown on imaging.

A dramatic MRI report is not enough by itself. The symptoms and imaging need to tell the same story.

Image and Diagram Suggestions

Diagram: Where an Epidural Steroid Injection Goes

Purpose: Show the anatomy and common injection paths.

Suggested elements:

• Vertebrae.
• Disc.
• Nerve root.
• Epidural space.
• Area of inflammation near a compressed or irritated nerve.
• Needle path examples for:
• Transforaminal approach.
• Interlaminar approach.
• Caudal approach.

Caption: The goal of an epidural steroid injection is to place anti-inflammatory medication near an irritated spinal nerve. It does not remove a disc herniation or permanently widen spinal stenosis.

Related Articles

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