If you are reading this, you probably did the right things. You had a hernia. You found a surgeon. You had the repair. The hernia is fixed. And now, weeks or months later, you have a different kind of pain than before — burning, electric, sometimes shooting into the inner thigh or scrotum or labia, often worse when you sit or stand for a long time, and sometimes triggered by something as light as a waistband or a seatbelt across the groin.
You went back to the surgeon. The surgeon checked for a recurrence. The exam was negative. The ultrasound or CT was negative. You were told the surgery is fine and it should fade with time. It has not faded. This post is about why that pain is real, why it is often not a recurrent hernia, and how a short diagnostic nerve block helps identify the likely source.
Why this gets missed
The usual reflex for groin pain after a hernia repair is “rule out recurrence.” That reflex made more sense before mesh repair became standard. With modern mesh repair, recurrence has fallen, and chronic pain is now the most important long-term problem for patients [8]. A negative recurrence workup answers only one question.
The right question is which of three nerves got caught in the operation. Three nerves pass through the inguinal canal and surrounding fascia, and every one of them is at anatomic risk during hernia repair. None of them show up on standard imaging. The ilioinguinal and iliohypogastric nerves are particularly vulnerable during open Lichtenstein repair: they cross the floor of the canal, are draped over the spermatic cord or round ligament, and can be entrapped during fascial closure or compressed against the mesh edge as it consolidates into surrounding scar. In a rabbit study, polypropylene mesh laid next to the ilioinguinal nerve produced myelin degeneration, endoneurial edema, fibrosis, and axonal loss after three months, the kind of damage expected from entrapment in scar [3]. The genitofemoral nerve has a different vulnerability. Its branches run below the iliopubic tract, in the area where laparoscopic preperitoneal mesh and tacks sit. Surgeons cannot reliably see these nerves intraoperatively. A meta-analysis of randomized trials found chronic groin pain in roughly 9.4% of patients at 6 months and 4.8% at 1 year after open mesh repair [1], and in a series of 600 mesh repairs, 4.3% of patients whose nerves were spared still had pain at one year, and the authors name involvement of one or more of the three inguinal nerves as the best-known cause of this pain [2]. The international groin-hernia guideline places clinically significant chronic postoperative inguinal pain at 10–12% of repairs, with debilitating pain that interferes with daily activity in 0.5–6% [5]. A meaningful fraction of these cases are clearly neuropathic rather than mechanical, and severe late-onset pain appearing years after repair has been traced at re-operation to ilioinguinal nerve entrapment within the mesh [4].
What makes the miss persistent is the second layer of the workup. After a negative recurrence study, the next move is often pelvic floor physical therapy, an MRI of the lumbar spine, a urology or gynecology consult, sometimes a course of opioid analgesics. None of those target a peripheral nerve. Patients can spend months in negative workups before anyone tests the nerves with an image-guided block.
The anatomy that matters
The ilioinguinal nerve (L1) enters the inguinal canal between the internal oblique and transversus abdominis, runs anterior to the spermatic cord or round ligament, exits the superficial inguinal ring, and supplies the skin of the inguinal crease, the base of the scrotum or labia majora, and a strip of the upper-medial thigh.
The iliohypogastric nerve (T12–L1) takes a similar path but exits one finger-breadth higher and supplies a band of skin above the inguinal ligament — the suprapubic and lateral hip region.
The genitofemoral nerve (L1–L2) is the third member of the cluster. Its genital branch enters the inguinal canal through the deep inguinal ring and supplies the cremaster muscle and the scrotal or labial skin. Its femoral branch exits through the femoral canal and supplies a patch of skin on the upper anterior thigh below the inguinal crease.
In an open Lichtenstein repair, the ilioinguinal and iliohypogastric nerves are typically dissected and protected, but they are at risk from suture entrapment during external oblique closure, from direct contact with mesh, or from delayed neuroma formation as the mesh edge becomes incorporated into scar. In a laparoscopic TEP or TAPP repair, the mesh sits in the preperitoneal space, and tacks placed below the iliopubic tract put the genitofemoral nerve and its femoral branch at the most risk. The risk to the ilioinguinal and iliohypogastric nerves is lower, but not zero.
When a patient describes burning along the inguinal crease into the scrotum or labia, ilioinguinal is the leading hypothesis. When the pain is higher and lateral, in the band above the inguinal ligament, iliohypogastric. When the pain is in the inner thigh below the crease or in the scrotum with a cremasteric quality, genitofemoral. Often there is overlap, and the territories vary from person to person, so the skin map points to a leading candidate rather than settling it.
If the tender spot sits higher, on the front of the belly beside the outer edge of the rectus muscle, the groin nerves are probably not the source. An end branch of a lower intercostal nerve trapped in the abdominal wall, anterior cutaneous nerve entrapment syndrome (ACNES), is the more likely answer, especially after a ventral or incisional repair.
How we diagnose
The diagnostic procedure is an ultrasound-guided peripheral nerve block of the suspected nerve. Performed in our procedure suite at 369 Lexington Avenue. Total visit time: about 30 minutes from check-in to walk-out.
The technique: with the patient supine, the inguinal anatomy is identified by ultrasound (anterior superior iliac spine landmark, the three layers of the abdominal wall musculature, the iliopubic tract). For the ilioinguinal and iliohypogastric nerves, a small volume of local anesthetic is placed in the plane between the internal oblique and transversus abdominis muscles, just inside the anterior superior iliac spine. For the genitofemoral nerve, the genital branch can be blocked at the deep inguinal ring. The femoral branch can be blocked separately just below the inguinal ligament, beside the femoral artery.
The diagnostic answer arrives in 10–15 minutes. A positive block is a clear drop in the usual pain while the anesthetic works. It makes the targeted nerve the likely dominant pain generator, not a certainty. There is no universal cut-off: the relief threshold and the number of blocks follow the clinical question and your insurance plan’s policy. The test has real limits. In a small placebo-controlled crossover trial of ultrasound-guided ilioinguinal and iliohypogastric blocks for pain after hernia repair, only 1 of 12 patients responded clearly to lidocaine while 5 responded to the placebo injection, and the authors concluded the blocks were not useful for diagnosis [6]. That is why the block result is read together with the pain map and the exam, never on its own. The patient keeps a pain diary every 30 minutes for the next four hours to track the duration of relief: that data informs the next step.
If the ilioinguinal block is negative or only partially effective, the iliohypogastric is the next target in a subsequent visit. If both are negative, the genitofemoral is run third. More than one nerve can be involved, because the territories overlap.
When the block clearly relieves the usual pain, the next step is referral to a surgeon who focuses exclusively on peripheral nerve entrapment (Step 3 below).
Treatment ladder and when surgery is the right call
The full ladder for chronic post-herniorrhaphy nerve pain:
Step 1 — neuropathic-pain medication trial. Gabapentin or pregabalin first-line, titrated to effective dose. Tricyclic antidepressant (nortriptyline) or SNRI (duloxetine) as second-line. A topical 5% lidocaine patch over the affected territory helps some patients. A structured trial of several weeks shows whether medication alone is enough.
Step 2 — image-guided diagnostic nerve block. The diagnostic workhorse. A small volume of local anesthetic points to which nerve is the likely source.
Step 3 — surgical referral. When the diagnostic block clearly relieves the usual pain, Dr. Movshis refers to a surgeon who focuses exclusively on peripheral nerve entrapment. The best-known operation is the Amid triple neurectomy — proximal transection of all three nerves (ilioinguinal, iliohypogastric, genitofemoral) with implantation of the proximal stumps into muscle to lower the chance of a new painful neuroma. The international hernia guideline suggests it, with mesh removal in selected cases, when medication and interventional treatment have not worked [5]. It is performed by a surgeon who focuses exclusively on nerve entrapment surgery, usually not the original operating surgeon. In Amid’s own series of 225 patients, 80% recovered completely and 15% had brief, minor pain that did not limit function [7]. In a 2025 series of 818 patients who had repeat surgery for chronic groin pain at one specialist hernia center, most with a neurectomy, 70% reported more than half their pain gone at their last follow-up, which was as short as a few days for some [8]. These are single-center results from expert surgeons. Modal Pain coordinates the referral and provides the surgical team with the documented diagnostic-block response, prior operative report from the index hernia repair, and any imaging — the documentation surgical neurectomy programs require to accept a referral.
Step 4 — peripheral nerve stimulation referral. For refractory cases not responding to the above ladder, percutaneous PNS at the affected nerve is an option that requires referral to an implanting specialist. It has FDA clearance, with evidence from a randomized trial in peripheral nerve pain and small case series [9].
The point of the ladder is not to delay surgery for the sake of delay. It is to confirm the nerve with a diagnostic block first, so that surgery goes to the specific patients for whom it genuinely is the right answer.
For referring physicians
When referring a patient with persistent groin pain >3 months after inguinal hernia repair, send: the operative report from the index repair (open vs. laparoscopic, mesh type, intra-operative regional anesthesia), any post-operative imaging that ruled out recurrence, the patient's response to any prior medication trial, and a brief note on the dominant cutaneous distribution of the pain (groin crease, suprapubic, scrotal/labial, inner thigh). We work up the three candidate nerves sequentially with ultrasound-guided diagnostic blocks, and we send notes back to the referring surgeon and primary as requested or as needed. If a diagnostic block clearly identifies the nerve, we coordinate referral to a surgeon who focuses exclusively on peripheral nerve entrapment and provide the surgical team with the diagnostic documentation they require.
Ready to evaluate your post-herniorrhaphy pain
If your groin pain has persisted more than three months after a hernia repair and a recurrence has been ruled out, the next step is a nerve-focused evaluation, which usually leads to an image-guided diagnostic block, not another imaging study. Same-week new-patient consultations are available.
Verify your insurance covers a post-hernia pain workup Book a same-week consultation
Or call (646) 290-6660. Dr. Movshis sees every patient personally — initial consultation through follow-up.
If a consultation feels premature, start with the Post-Surgical Nerve Pain Self-Assessment. Four to six minutes, and it sorts which of the three groin nerves — ilioinguinal, iliohypogastric, or genitofemoral — your pain pattern actually implicates. That distinction determines where the diagnostic block goes, so it is worth knowing before any appointment.
For the broader framework on chronic post-surgical nerve pain across surgical contexts, see the post-surgical and iatrogenic nerve pain page.
References
This article is reviewed against the peer-reviewed literature. Citations retrieved from PubMed.
- Charalambous MP, Charalambous CP. Incidence of chronic groin pain following open mesh inguinal hernia repair, and effect of elective division of the ilioinguinal nerve: meta-analysis of randomized controlled trials. Hernia. 2018;22(3):401-409. doi:10.1007/s10029-018-1753-9 · PubMed
- Zannoni M, Nisi P, Iaria M, et al. Wide nervous section to prevent post-operative inguinodynia after prosthetic hernia repair: a single center experience. Hernia. 2014;19(4):565-70. doi:10.1007/s10029-014-1248-2 · PubMed
- Demirer S, Kepenekci I, Evirgen O, et al. The effect of polypropylene mesh on ilioinguinal nerve in open mesh repair of groin hernia. Journal of Surgical Research. 2006;131(2):175-81. doi:10.1016/j.jss.2005.10.024 · PubMed
- Delikoukos S, Fafoulakis F, Christodoulidis G, et al. Re-operation due to severe late-onset persisting groin pain following anterior inguinal hernia repair with mesh. Hernia. 2008;12(6):593-5. doi:10.1007/s10029-008-0392-y · PubMed
- HerniaSurge Group. International guidelines for groin hernia management. Hernia. 2018;22(1):1-165. doi:10.1007/s10029-017-1668-x · PubMed
- Bischoff JM, Koscielniak-Nielsen ZJ, Kehlet H, Werner MU. Ultrasound-guided ilioinguinal/iliohypogastric nerve blocks for persistent inguinal postherniorrhaphy pain: a randomized, double-blind, placebo-controlled, crossover trial. Anesth Analg. 2012;114(6):1323–9. doi:10.1213/ANE.0b013e31824d6168 · PubMed
- Amid PK. Causes, prevention, and surgical treatment of postherniorrhaphy neuropathic inguinodynia: triple neurectomy with proximal end implantation. Hernia. 2004;8(4):343–9. doi:10.1007/s10029-004-0247-0 · PubMed
- Huy TC, Lu Y, Weitzner Z, et al. Reoperation for Chronic Postoperative Inguinal Pain. JAMA Surg. 2025;160(9):984–991. doi:10.1001/jamasurg.2025.2502 · PubMed
- Deer T, Pope J, Benyamin R, et al. Prospective, Multicenter, Randomized, Double-Blinded, Partial Crossover Study to Assess the Safety and Efficacy of the Novel Neuromodulation System in the Treatment of Patients With Chronic Pain of Peripheral Nerve Origin. Neuromodulation. 2016;19(1):91–100. doi:10.1111/ner.12381 · PubMed
Frequently Asked Questions
Some pain in the first weeks after surgery is expected. Bothersome pain that is still affecting daily activities 3 months after surgery meets the international hernia guideline's definition of chronic postoperative inguinal pain. When it is burning or electric, an irritated nerve is a more likely cause than a recurrence. A normal ultrasound or CT of the surgical site is supportive evidence: structural recurrence shows up on imaging, nerve entrapment usually does not.
Recurrent hernia is a structural bulge that protrudes with Valsalva, coughing, or straining, and that is reducible by gentle pressure. The pain is mechanical and dull. Nerve entrapment is burning, electric, or lancinating pain in the cutaneous distribution of the ilioinguinal, iliohypogastric, or genitofemoral nerve. There is no bulge. The pain is reproduced by Tinel testing at the affected nerve, not by Valsalva. Imaging-negative groin pain at 3+ months post-repair is often nerve entrapment, though mesh-related pain and other causes belong on the list too.
It depends on the surgical approach. Open Lichtenstein repair classically injures the ilioinguinal nerve at the external oblique aponeurosis, often by suture entrapment, direct ligation, or mesh contact. Laparoscopic TEP and TAPP repairs more commonly injure the genitofemoral nerve or its femoral branch, which run below the iliopubic tract where tacks and mesh sit. The iliohypogastric nerve can be co-injured with either approach. The skin map and exam point to a leading candidate, and image-guided blocks test it. Because the nerves overlap and blocks have limits, the result is read together with the exam.
It is the best-known salvage operation for refractory groin pain after hernia repair. A surgeon who specializes in groin nerve pain cuts the ilioinguinal, iliohypogastric, and genitofemoral nerves above the operative field and implants the cut ends into muscle to lower the chance of a new painful neuroma. In Amid's own series of 225 patients, 80% recovered completely. In a 2025 series of 818 patients who had repeat surgery at one hernia center, 70% reported more than half their pain gone at last follow-up, which was short for some. Both come from specialist centers. Modal Pain coordinates the referral and provides the block documentation surgical programs require.
The trial injection is diagnostic first. It uses a small volume of local anesthetic and gives a few hours of relief, by design, to answer the question 'is this nerve the likely source?' When the injection clearly relieves the usual pain, Dr. Movshis refers to a surgeon who focuses exclusively on peripheral nerve entrapment.
Most commercial PPO insurance plans cover image-guided ilioinguinal, iliohypogastric, and genitofemoral nerve blocks for chronic post-surgical neuropathic pain, typically with prior authorization. We check your benefits and go over what your plan covers and any expected cost by phone before your visit, so there are no surprise bills. Most commercial PPO plans are accepted, including Aetna, Anthem Blue Cross Blue Shield, Cigna, Empire Blue Cross Blue Shield, the Empire Plan, Oscar, Oxford, UMR and UnitedHealthcare. The practice does not accept Medicare, Medicaid, HMO plans, or workers' compensation. Check your plan or call (646) 290-6660.
If the question is whether the hernia has recurred, see the surgeon. If the surgeon has found no recurrence (imaging-negative, no bulge on Valsalva), the next step is a pain medicine evaluation focused on the three candidate nerves, not another structural workup. The international hernia guideline suggests managing this pain with medication and interventional treatment first, through a team approach. If surgery is needed later, it is usually a neurectomy, sometimes with mesh removal, done by a surgeon who specializes in groin pain.
