Epidural Steroid Injections: What to Expect, Start to Finish
Nervous about your first epidural steroid injection? Here's exactly what happens before, during, and after — and how to judge whether it worked.
Dr. Nikhil Iyer, MD 3 min read
The phrase "spinal injection" makes almost everyone tense up. Fair enough — it's your spine. But an epidural steroid injection (ESI) is one of the most commonly performed procedures in pain medicine, it takes about ten minutes, and knowing what actually happens removes most of the fear.
Why this injection works
When a disc herniation or stenosis irritates a spinal nerve, the nerve becomes inflamed — swollen, chemically irritated, and hypersensitive. An ESI places corticosteroid (a potent anti-inflammatory) directly into the epidural space, the sleeve surrounding those nerves. Instead of medicating your whole body with pills, we deliver medication precisely where the problem is.
Before your procedure
- We review your imaging. The injection is planned to the specific level and side your MRI and exam point to.
- Medication check. Tell us about blood thinners — some need to be paused, and we coordinate that with your prescribing doctor. Most other medications continue as normal.
- Eat normally unless you've chosen sedation. Arrange a driver if you have.
During the 10 minutes that matter
You'll lie face-down on a procedure table. The skin is cleaned and numbed with local anesthetic — this brief sting is usually the most uncomfortable part. Using fluoroscopy (real-time X-ray), a thin needle is guided to the epidural space, its position confirmed with a small amount of contrast dye, and the medication is delivered. Most patients describe pressure, not pain.
Afterward
You'll be observed briefly, then walk out. The local anesthetic may make things feel better (or a leg feel heavy) for a few hours — that's temporary. The steroid typically starts working within 2 to 7 days.
Plan on taking it easy the rest of the day. Most people return to work the next morning.
How to judge success
Keep a simple log for two weeks: pain score morning and night, plus what you could do (walk the block? sleep through the night? sit through dinner?). "It worked" doesn't just mean less pain — it means more function. That log directly shapes the next step:
- Great relief that lasts — we protect the win with physical therapy.
- Good but partial or temporary relief — a repeat injection may be appropriate, spaced safely.
- No change — equally valuable information. It tells us the pain generator is likely elsewhere, and we adjust the plan rather than repeating what didn't work.
Common questions
How many can I have? There's no magic number, but steroid exposure is spaced deliberately — typically no more than a few in a year, always justified by response.
Will it fix the disc? No — it calms the inflamed nerve while your body heals the disc, which it usually does. The injection buys comfort and function during that window.
Is it safe? Serious complications are rare when performed under image guidance by fellowship-trained hands. We'll go over the specific risks for your anatomy and health history before anything happens — and you'll have time to ask everything.
An ESI isn't a cure-all, and any physician who sells it that way should be questioned. Used precisely, on the right patient, at the right time, it's one of the most useful tools we have for getting people through the worst stretch of spine pain.