Lumbar Epidural Steroid Injection (ESI)

A straightforward Guide for Patients

What is a Lumbar Epidural Steroid Injection?

A lumbar epidural steroid injection is a minimally invasive treatment used to calm inflammation around irritated spinal nerves. This procedure can help patients who struggle with conditions such as disc herniations, nerve irritation, sciatica, shingles-related pain, post-surgical pain, and other sources of low-back or leg discomfort. It is often performed along with other conservative treatments like physical therapy or rehabilitation programs.

There are several ways your provider may approach the epidural space. The best technique depends on your symptoms, imaging findings, and treatment goals. Common approaches include:

  • Interlaminar epidural injection
  • Transforaminal epidural injection
  • Caudal epidural injection

Your provider may choose from different steroid medications, such as dexamethasone, methylprednisolone, triamcinolone, or betamethasone.

Purpose of the Injection

Inflammation around spinal nerves is one of the leading causes of back and leg pain. When nerves become irritated, they can send persistent pain signals. Delivering a corticosteroid into the epidural space helps decrease this inflammation, which may reduce pain, improve mobility, and support your participation in physical therapy or other treatments.

What to Expect During the Procedure

The injection is performed in a sterile procedure room using real-time X-ray guidance for accuracy and safety.

  • The skin is cleaned and numbed with local anesthetic.
  • Most patients do not need sedation, although it may be offered for certain approaches.
  • Occasionally, you may feel a brief “electric” sensation down the leg or arm depending on the area treated—this is normal and not harmful.
  • The procedure typically takes about 10-15 minutes.

Afterward, you’ll spend a short time in the recovery area before going home.

Aftercare Instructions

General Care

  • If you received sedation, do not drive or operate machinery for 24 hours.
  • You may return to normal daily activities as tolerated.
  • Showering is allowed, but avoid soaking in a tub, pool, or lake for 24 hours.
  • Pain relief may take 7–10 days as the steroid begins working.
  • The care team will call you the next day to check on your recovery.

If Sedation Was Used

  • No solid food for 8 hours before the procedure.
  • Clear liquids only up to 2 hours before your appointment
    (water, broth, clear juice without pulp, black coffee or tea).
  • No carbonated drinks, gum, candy, mints, or throat lozenges in the 2 hours prior.
  • The care team will review your medications and tell you which ones to take beforehand.
  • Not following these instructions may require the procedure to be rescheduled.

Possible Risks and Side Effects

Lumbar epidural steroid injections are generally safe, but, like any medical procedure, carry potential risks. These include:

  • Temporary soreness at the injection site
  • Infection (skin or, very rarely, epidural abscess)
  • Bleeding or epidural hematoma
  • Dural puncture (“spinal headache”) that improves when lying flat
  • Temporary increase in pain
  • Stroke (extremely rare)
  • Nerve irritation or, in very rare cases, nerve or spinal cord injury
  • Allergic reaction to medications (local anesthetics, contrast dye, or steroid)
  • Rare complications such as epidural fibrosis, aseptic meningitis, seroma, or GI/renal side effects
  • Occasional inability to complete the procedure due to anatomy or technical difficulty

Important: If you take blood-thinning medications such as Plavix, aspirin, Xarelto, warfarin, heparin, Lovenox, Brilinta, or others, let your provider know. Special instructions may be required before your procedure.

When Will I Feel Relief?

Steroids work gradually by reducing inflammatory chemicals at the nerve root. Most patients begin to notice improvement within 7–10 days. Any immediate relief you feel is usually from the local anesthetic used during the injection.

If one type of epidural injection does not provide adequate benefit, your provider may recommend a different approach or alternative treatments. A follow-up visit is usually scheduled about one month after the procedure.

Insurance Requirements

Most insurance plans require certain steps before approving an epidural steroid injection. These often include:

  • A trial of physical therapy or provider directed Home Exercise Program (commonly for 6 weeks)
  • Recent imaging, such as X-rays or an MRI
  • Documentation showing that other conservative treatments did not provide adequate relief