Abdominal cutaneous nerve entrapment syndrome, usually called ACNES, is diagnosed and treated by a surprisingly wide range of doctors, from family physicians who can handle first-line injections in the office to surgeons who perform neurectomies when pain persists. The condition involves cutaneous branches of the lower thoracoabdominal intercostal nerves getting compressed at the edge of the rectus abdominis muscle, producing chronic pain that often mimics visceral problems like gallbladder disease or appendicitis. Because ACNES tends to be underrecognized, the biggest hurdle is usually finding a doctor who considers it in the first place.
Family Physicians Are the Front Door
Your family doctor or general practitioner is typically the first clinician you see for unexplained abdominal pain, and that turns out to be exactly the right starting point for ACNES. Family physicians can perform the key bedside exam, order confirmatory injections, and in many cases deliver the treatment that resolves the problem without a referral. The standard first-line treatment is an injection of local anesthetic combined with a corticosteroid at the point of maximum tenderness, and this can be carried out in a primary care office.1PubMed Central. Chronic abdominal pain due to entrapment of the anterior abdominal cutaneous nerve (ACNES): About a case
The trouble is that many primary care doctors have never heard of ACNES. A Dutch study screened patients across four primary care practices where the physicians were unaware of the condition and found that a clinically relevant portion of patients who had been labeled with “functional abdominal pain” actually had an abdominal wall pain syndrome like ACNES.2The Journal of the American Board of Family Medicine. Chronic Abdominal Wall Pain Misdiagnosed as Functional Abdominal Pain That mislabeling can mean years of unnecessary tests, failed treatments, and frustration. If your family doctor is open to the possibility of abdominal wall pain and willing to try a trigger-point injection, you may not need any specialist at all. If they are unfamiliar with the diagnosis, you may need to ask for a referral to someone who is.
How the Diagnosis Actually Works
Before any specialist can treat ACNES, someone has to recognize it. The condition does not show up on blood tests, CT scans, or endoscopies, which is a big part of why it gets missed. Diagnosis is clinical, meaning it depends on the history and a hands-on exam rather than imaging.
The single most useful bedside test is Carnett’s test. The examiner presses on the spot where you feel pain while you tense your abdominal muscles, usually by lifting your head and shoulders off the table. If the pain stays the same or gets worse with tensing, the test is positive, which points toward the abdominal wall rather than an organ inside the abdomen.3PubMed. The Diagnostic Value of Carnett’s Test with Chronic Abdominal Pain: A Narrative Review With visceral pain from something like an inflamed gallbladder or irritable bowel, tensing the muscles usually shields the organs and makes the pain decrease, so the test is negative. Research confirms that Carnett’s test reliably separates abdominal wall pain from intra-abdominal pain.4PubMed. Diagnostic usefulness of Carnett’s test in psychogenic abdominal pain
Ultrasound has an emerging role as well. While standard abdominal imaging misses ACNES by design (it looks at organs, not nerves in the muscle wall), targeted ultrasound can help localize the entrapment point and guide injections precisely to it. Case reports illustrate that the entrapment can occur at either the medial or lateral border of the rectus muscle, and ultrasound helps identify which location is involved for accurate treatment.5PubMed Central. Spectrum of abdominal anterior cutaneous nerve entrapment syndrome (ACNES) with successful management: a case report In one cross-sectional survey, ultrasound-guided injections were responsible for establishing the diagnosis in about 85% of confirmed cases.6PubMed Central. Abdominal cutaneous nerve entrapment syndrome: A cross sectional survey of treatment outcomes
Pain Medicine Specialists
When injections from primary care do not provide lasting relief, or when the diagnosis needs confirmation by someone experienced with neuropathic pain, pain medicine physicians step in. These are doctors, often anesthesiologists or physiatrists with subspecialty training in pain management, who work in dedicated pain clinics. They bring more advanced injection techniques and additional tools beyond the initial steroid-plus-anesthetic approach.
One option they offer is pulsed radiofrequency, a minimally invasive procedure that applies short bursts of electrical energy near the affected nerve to interrupt pain signaling without destroying the nerve. A retrospective study of 26 patients treated with pulsed radiofrequency for ACNES found that some patients also received corticosteroids at the treatment site afterward, though a subgroup analysis showed that the added steroid did not significantly change pain scores or patient satisfaction compared with pulsed radiofrequency alone.7PubMed Central. Pulsed Radiofrequency as a Minimally Invasive Treatment Option in Anterior Cutaneous Nerve Entrapment Syndrome: A Retrospective Analysis of 26 Patients Pain specialists also manage the broader neuropathic pain component. ACNES is fundamentally a nerve problem, and the same medications used for other types of nerve pain, such as certain antidepressants and anticonvulsants, sometimes form part of the overall treatment plan.
The injection-based therapy managed by pain specialists has solid outcomes overall. Survey data show that local anesthetic and steroid injections were successful in roughly three-quarters of patients, with the duration of pain relief ranging widely from a few weeks to several years.6PubMed Central. Abdominal cutaneous nerve entrapment syndrome: A cross sectional survey of treatment outcomes For those who respond well to a single injection, no further treatment may be needed. For others, a series of injections or a step up to radiofrequency or surgery becomes the plan.
Surgeons Who Operate on ACNES
When injections fail to control the pain long-term, surgery enters the picture. The standard operation is an anterior neurectomy, in which the surgeon removes the small branch of nerve that is trapped at the abdominal wall. This is typically performed as an outpatient procedure and does not require entering the abdominal cavity itself. General surgeons with experience in abdominal wall procedures are the most common operators, though the condition is also managed by some plastic surgeons and peripheral nerve surgeons.
Outcomes for anterior neurectomy are encouraging but imperfect. A retrospective study reviewing 195 patients reported a short-term success rate of about 70% and a long-term success rate of roughly 61% at a mean follow-up of just under three years.8PubMed Central. Surgical Management of Abdominal Anterior Cutaneous Nerve Entrapment Syndrome: Case Report, Surgical Technique, and Literature Review That same survey data mentioned earlier found an even higher surgical success rate of 90%, though the number of surgical patients in that sample was smaller.6PubMed Central. Abdominal cutaneous nerve entrapment syndrome: A cross sectional survey of treatment outcomes The range across studies reflects real variability in surgical selection, technique, and how “success” is defined, but the broad pattern is that surgery works for the majority of patients who reach that step.
What happens when a neurectomy does not work? This is where dedicated surgical expertise matters. A study tracked 71 patients who still had unacceptable pain or developed recurrent pain after an anterior neurectomy. Of those, 41 underwent secondary surgery, either a re-exploration of the original site or a posterior neurectomy, which targets the nerve at a different point along its course. After roughly two years of follow-up, about two-thirds of those secondary surgical patients had a successful outcome. Patients whose pain had initially resolved and then recurred did better with revision surgery than patients whose pain never improved after the first operation.9PubMed. Surgical options after a failed neurectomy in anterior cutaneous nerve entrapment syndrome If you are facing a failed first surgery, seeking out a center with specific ACNES experience is worth the effort.
Gynecologists and the Pelvic Pain Overlap
ACNES often mimics gynecologic conditions, and the reverse is true too. Women with chronic pelvic pain frequently cycle through gynecology evaluations before anyone considers the abdominal wall as the source. At the same time, gynecologists are increasingly aware that nerve entrapment belongs on their differential diagnosis list.
Nerve entrapment is recognized as a subtype of neuropathic pain in obstetrics and gynecology practice. When a single nerve or nerve root is compressed, symptoms stay localized to the skin area that nerve supplies, which can mimic endometriosis, ovarian pathology, or post-surgical adhesion pain depending on the location. For entrapment of pelvic-region nerves like the ilioinguinal, iliohypogastric, or genitofemoral nerves, small observational studies suggest that roughly half to four-fifths of patients report meaningful pain relief after a nerve block.10PubMed Central. Evaluation and Treatment of Chronic Pelvic Pain These blocks serve double duty as both a diagnostic test and a treatment. If numbing the nerve eliminates the pain, it confirms the nerve was the problem, and the relief itself may last well beyond the duration of the anesthetic.
A gynecologist who suspects nerve entrapment will typically refer to a pain specialist or neurologist for definitive nerve blocks, or may perform them in-office if they have the training. The takeaway for patients is that if your chronic pelvic pain does not match any structural gynecologic finding, asking about nerve entrapment is reasonable and may short-circuit a long diagnostic odyssey.
When ACNES Sends You to the Emergency Room
ACNES does not always present as a slow-burn chronic problem. It can flare acutely, and when it does, many patients end up in the emergency department with sharp, localized abdominal pain that looks, on first glance, like something surgical. Emergency physicians play an important role in the ACNES story, though their job is less about treating it and more about recognizing it and ruling out emergencies.
The diagnostic overlap with appendicitis is a particular headache. Both ACNES and acute appendicitis can cause pain in the right lower abdomen, and research has shown that a substantial portion of appendicitis patients have somatosensory disturbances in the right lower quadrant that look nearly identical to the findings in acute ACNES.11PubMed. Acute Appendicitis, Somatosensory Disturbances (“Head Zones”), and the Differential Diagnosis of Anterior Cutaneous Nerve Entrapment Syndrome (ACNES) Differentiating the two in an emergency setting is genuinely difficult, and imaging plus a period of observation may be needed to sort it out. Emergency physicians routinely order blood work and ultrasound to rule out intra-abdominal emergencies, and these tests are usually normal in ACNES, which is itself a diagnostic clue.12PubMed Central. Characteristics of children presenting to the emergency department with anterior cutaneous nerve entrapment syndrome
The ER is not the place to get definitive ACNES treatment, but it is the place where the seed of the diagnosis can be planted. If an emergency physician performs Carnett’s test and considers abdominal wall pain in the differential, the patient can be directed to the right follow-up rather than discharged with a vague instruction to see a gastroenterologist.
Pediatric Specialists and ACNES in Children
ACNES is not just an adult condition. It shows up in children and adolescents, where it causes the same frustrating diagnostic delays and often worse disruption to daily life because of missed school and restricted activities. Pediatricians, pediatric gastroenterologists, and pediatric surgeons all play roles in the care of young patients with ACNES.
The diagnostic approach in children is similar to adults: Carnett’s sign is the key physical exam finding, and the standard first treatment is an ultrasound-guided injection of local anesthetic. Over-the-counter pain relievers like acetaminophen and anti-inflammatory drugs have not been found to be effective for ACNES in adolescents, making injection therapy the real first-line option.13PubMed Central. Anterior cutaneous nerve entrapment syndrome in children A systematic review of treatment strategies in pediatric ACNES confirmed that a step-up approach works best: start with local anesthetic injections, and reserve surgery for children who do not respond.14PubMed. Treatment strategies for anterior cutaneous nerve entrapment syndrome in children: A systematic review
When surgery is needed, the results in children can be dramatic. In the first published series of pediatric cutaneous neurectomies, six previously healthy school-aged children with refractory ACNES underwent the procedure in a day-care setting. Before surgery, their quality of life was significantly diminished, with an average of 25 days of missed school and major restrictions in daily activities and sports. After the neurectomy, all six were free of pain and had returned to their normal routines at six-month follow-up.15Journal of Pediatric Surgery. Cutaneous neurectomy for anterior cutaneous nerve entrapment syndrome in children Pediatric surgeons with experience in this area are the appropriate operators, and the decision to proceed to surgery should involve a pediatric pain team.
Physical Therapists and Conservative Management
Not every case of ACNES requires needles or a scalpel. Physical therapists and practitioners of manual medicine have reported success treating the condition with hands-on techniques that aim to free the entrapped nerve mechanically or reduce the tissue irritation around it.
One case study described a patient who achieved complete resolution of pain and functional limitations through a combination of osteopathic manipulation, active release techniques, instrument-assisted soft tissue work, cupping, and targeted exercises over six visits spanning ten weeks.16PubMed Central. A Novel Approach to Assessing and Conservatively Treating Anterior Cutaneous Nerve Entrapment Syndrome: A Case Study Another case report showed that manual therapy combined with rehabilitation and desensitization techniques significantly reduced the frequency and severity of ACNES symptoms without any injections or medications.17PubMed. Conservative management of anterior cutaneous nerve entrapment syndrome: A case report
The evidence here is limited to case reports rather than large trials, so it is hard to say how reliably physical therapy works across a broad population of ACNES patients. But for people who want to avoid injections, who have contraindications to steroids, or who have mild-to-moderate symptoms, a trial of hands-on therapy with a therapist who understands abdominal wall pain is a reasonable option to explore before escalating treatment. Physical therapists do not diagnose ACNES on their own, so you would still need a physician to establish the diagnosis and rule out other causes first.
Bilateral ACNES and the Question of Complexity
Most ACNES cases involve one side of the abdomen, but about 13% of patients diagnosed at a large referral center had bilateral ACNES, meaning both sides were affected.18BMJ Journals (Regional Anesthesia & Pain Medicine). Bilateral distribution of anterior cutaneous nerve entrapment syndrome (ACNES): are clinical features and outcomes comparable to unilateral ACNES? Bilateral cases were more commonly seen in women and tended to report higher peak pain scores than unilateral cases. After a median follow-up of just over two years, roughly 61% of bilateral ACNES patients reported treatment success, which is comparable to the long-term surgical success rates seen in unilateral cases but suggests that bilateral disease is not inherently harder to treat, just somewhat more painful at its worst.
If your pain affects both sides, the same doctors handle it, but the treatment plan may be more involved because each side needs to be addressed individually. Bilateral ACNES also makes the initial diagnosis trickier, because symmetric abdominal pain is more likely to be attributed to an internal organ problem or a systemic condition than to a nerve issue in the muscle wall.
Finding the Right Doctor in Practice
Because ACNES crosses specialty boundaries, there is no single “ACNES doctor” in most healthcare systems. The practical path usually follows a predictable sequence. You see your family doctor first. If they are aware of abdominal wall pain and perform Carnett’s test, you may get diagnosed and treated right away. If not, you might be sent for imaging, blood work, and specialist consultations that come back normal, which is actually a useful finding because normal results in someone with localized abdominal pain and a positive Carnett’s test make ACNES more likely, not less.
From primary care, referrals branch depending on what is available locally. A pain management clinic is the most direct referral for injection therapy and potential radiofrequency treatment. A general surgeon with abdominal wall experience handles cases that need neurectomy. In academic medical centers, there are occasionally multidisciplinary clinics or individual surgeons who have developed ACNES as a particular interest and can manage the entire treatment ladder from diagnosis through revision surgery.
The condition was first well-characterized in the Netherlands, and Dutch centers still tend to have the most concentrated experience. But awareness has grown steadily in North America, the UK, and elsewhere. If you suspect ACNES and your doctor is unfamiliar with it, bringing a printed article to your appointment is not a bad strategy. The diagnosis depends on a physical exam that any trained physician can perform. The barrier is awareness, not access to exotic technology.
Why ACNES Gets Missed So Often
ACNES has a reputation as an underdiagnosed condition, and the reasons are structural rather than mysterious. Medical training emphasizes visceral causes of abdominal pain, the organs inside. The abdominal wall itself, the muscles and nerves that make up the container, gets surprisingly little attention in standard curricula. When a patient presents with chronic abdominal pain, the reflex is to order imaging and scope the gastrointestinal tract, not to palpate the abdominal wall looking for a trigger point.
This creates a pattern that patients with ACNES know well: repeated normal test results, a growing stack of specialist visits, and eventually a label like “functional pain” or “irritable bowel syndrome” applied more from diagnostic fatigue than from positive evidence. The Dutch primary care study illustrated exactly this dynamic, with patients carrying functional pain diagnoses that turned out to be treatable abdominal wall conditions.2The Journal of the American Board of Family Medicine. Chronic Abdominal Wall Pain Misdiagnosed as Functional Abdominal Pain ACNES is characterized by entrapment of cutaneous nerve branches that causes severe and often treatment-resistant chronic pain, making accurate diagnosis especially important to avoid prolonged suffering.19PubMed Central. Anterior cutaneous nerve entrapment syndrome: management challenges
The good news is that when a doctor does think of ACNES, the path from suspicion to treatment is short. The bedside exam takes minutes, a diagnostic injection confirms or refutes the hypothesis within minutes more, and the first treatment is often delivered in that same visit. The medical infrastructure needed to manage ACNES already exists in virtually every primary care office and pain clinic. The gap is cognitive, not logistical.