An ilioinguinal nerve block is a targeted, image-guided injection that quiets the ilioinguinal nerve to help diagnose and relieve chronic pain in the groin, lower abdomen, and inguinal region — including stubborn pain that lingers after hernia repair or other lower-abdominal surgery.
OVERVIEW
What an ilioinguinal nerve block is and how it works
The ilioinguinal nerve is a small sensory nerve that arises from the upper lumbar spine (around L1), travels through the abdominal-wall muscles, and reaches the groin. It supplies sensation to the lower abdomen, the inguinal (groin) crease, the upper medial thigh, and part of the external genitalia. When this nerve is irritated, entrapped, or injured — often by scar tissue, sutures, or surgical mesh after a hernia repair, a Pfannenstiel (C-section) incision, or other lower-abdominal surgery — it can produce burning, sharp, or aching groin pain that ordinary treatments struggle to reach.
During an ilioinguinal nerve block, your Columbia Pain & Spine Institute physician places a small amount of local anesthetic, sometimes combined with an anti-inflammatory steroid, next to the nerve to interrupt the pain signals it is carrying. The injection serves two purposes. As a diagnostic tool, meaningful relief after the block helps confirm the ilioinguinal nerve as the source of your groin pain. As a therapeutic tool, the same injection can calm inflammation around the nerve and provide a period of relief that supports activity and rehabilitation. A clear, reproducible response may also help your physician decide whether you are a candidate for longer-lasting options. This procedure is one of several nerve blocks we offer across our Gresham and Portland, Oregon practice.
Commonly treats
YOUR PROCEDURE
What to expect
Before
Your physician reviews your history, prior surgeries, and the exact location of your pain to confirm the ilioinguinal nerve is a likely source. Tell us about blood thinners, diabetes medications, and allergies. Little preparation is usually needed; most patients eat normally and take routine medications unless instructed otherwise. The block is performed in our Gresham office or at the on-site Burnside Surgery Center.
During
You lie on your back while the skin near the front of the hip and groin is cleaned and numbed. Using ultrasound guidance, your physician advances a thin needle toward the nerve as it passes between the abdominal-wall muscles, then delivers the medication. Image guidance allows precise placement near the nerve while avoiding nearby structures. The injection itself typically takes only a few minutes.
After and recovery
- You rest briefly while we monitor you and are usually discharged the same day; the whole visit generally takes well under an hour.
- Numbness or noticeable relief in the groin from the local anesthetic often begins within minutes — an important clue we use to interpret the diagnostic result.
- Mild soreness or bruising at the injection site is common and usually settles within a day or two.
- If a steroid was included, its full anti-inflammatory effect may take several days to develop.
- Most people resume normal activities the next day; your care team will give specific guidance and track your response over follow-up visits.
FAQS
Frequently asked questions
Is an ilioinguinal nerve block diagnostic or therapeutic?
It can be both. The block first helps confirm whether the ilioinguinal nerve is the source of your groin pain — clear relief after the injection points to that nerve. The same injection, especially when a steroid is added, may also provide a period of therapeutic relief. Your physician uses your response to guide the next step in your care.
Will it cure pain from my old hernia surgery?
The block is a treatment, not a guaranteed cure. For chronic post-hernia (post-surgical) groin pain, it can reduce pain and help confirm the diagnosis. Some patients gain lasting benefit, while others need repeat blocks or additional therapies. We are honest that results vary from person to person.
How is this different from other groin or pelvic nerve blocks?
The ilioinguinal nerve is one of several nerves in this region and often travels alongside the iliohypogastric and genitofemoral nerves. Depending on where your pain maps, your physician may instead or additionally consider an abdominal-wall transversus abdominis plane (TAP) block or, for pain centered in the pelvis or perineum, a pudendal nerve block. We tailor the target to your specific symptoms.