Pudendal Neuralgia
Chronic pelvic pain from pudendal nerve entrapment or injury
ICD-10: G57.70 · sacroiliac condition
Pudendal neuralgia is chronic pain in the distribution of the pudendal nerve — the main sensory and motor nerve of the perineum, including the genitals, urethra, anus, and perineal skin. The pudendal nerve exits the pelvis through the greater sciatic notch, wraps around the sacrospinous ligament, and re-enters the pelvis through the lesser sciatic foramen, traveling through Alcock's canal (the pudendal canal formed by the obturator internus fascia). Compression or entrapment at any of these anatomical points produces pudendal neuralgia. Patients describe burning, shooting, or electric pain in the perineum, genitals, or rectum. The hallmark symptom is that pain is worse sitting and relieved by standing or lying down — a pattern that directly reflects increased pudendal nerve compression with seated posture. Many patients cannot sit for more than a few minutes and experience significant occupational and social disability. Pudendal neuralgia disproportionately affects cyclists and other seated athletes due to prolonged perineal compression. Diagnosis relies on the Nantes criteria: pain in the pudendal nerve territory, worse with sitting, no objective sensory loss, and relief with pudendal nerve block. Treatment is multidisciplinary, combining pelvic floor physical therapy, pudendal nerve blocks (diagnostic and therapeutic), neuromodulation, and surgical decompression in carefully selected cases.
Anatomy & Pathology
The pudendal nerve arises from the S2–S4 sacral nerve roots and exits the pelvis through the greater sciatic foramen, wraps around the ischial spine, and re-enters the pelvis through the lesser sciatic foramen. It then travels through Alcock's canal — a tunnel formed within the obturator fascia — and divides into three branches: the inferior rectal nerve (anal canal and perianal skin), the perineal nerve (scrotum or labia), and the dorsal nerve of the penis or clitoris. Entrapment can occur at the ischial spine, the sacrospinous-sacrotuberous ligament complex, or within Alcock's canal.
Symptoms
- Burning, shooting, or crushing pain in the perineum, genitals, urethra, or rectum
- Pain significantly worse with sitting, better standing or lying
- Allodynia — clothing or touch in the perineal area triggers pain
- Painful sexual intercourse (dyspareunia) or erectile dysfunction
- Urinary frequency, urgency, or hesitancy
- Anorectal pain and sensation of rectal fullness or foreign body
- Cycling, prolonged sitting, or prior perineal surgery precipitating onset
Causes & Risk Factors
- Pudendal nerve entrapment in Alcock's canal (most common anatomical site)
- Compression at the sacrospinous ligament or ischial spine
- Prolonged cycling causing saddle-induced perineal compression
- Obstetric trauma (prolonged labor, instrumental delivery) stretching or compressing the nerve
- Pelvic surgery (hysterectomy, prostatectomy, rectal resection) causing nerve injury or scarring
Treatment Options
Conservative
- Pelvic floor physical therapy to reduce hypertonic pelvic floor muscles compressing the nerve
- CT-guided pudendal nerve block with local anesthetic and corticosteroid (diagnostic and therapeutic)
- Neuropathic pain medications: amitriptyline, gabapentin, pregabalin
Surgical
- Surgical pudendal nerve decompression via transgluteal, transperineal, or transischiorectal approach
- Pulsed radiofrequency ablation of the pudendal nerve at the ischial spine
- Sacral neuromodulation (S3 nerve root stimulation) for refractory pelvic floor dysfunction and pain
When to see a spine specialist
Any patient with chronic perineal, genital, or rectal pain worsened by sitting that has not responded to standard treatments should be evaluated by a pelvic pain specialist, urogynecologist, or colorectal surgeon with expertise in pudendal neuralgia. Urological, gynecological, and anorectal causes of pelvic pain should be excluded before attributing symptoms to the pudendal nerve.
Specialists Who Treat Pudendal Neuralgia
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Search spine specialists →Frequently Asked Questions
What are the Nantes criteria for pudendal neuralgia?
The Nantes criteria (2008) define pudendal neuralgia as: (1) pain in the territory of the pudendal nerve (from anus to penis/clitoris); (2) pain predominantly worse sitting; (3) no waking at night from pain; (4) no objective sensory loss on examination; and (5) positive diagnostic pudendal nerve block. Absence of any one criterion makes the diagnosis unlikely. Additional features supporting the diagnosis include allodynia, pain provoked by defecation or intercourse, and a specific anatomical tenderness at the ischial spine.
Can cycling cause pudendal neuralgia?
Yes. Prolonged cycling — particularly on narrow saddles — compresses the pudendal nerve between the saddle and the ischial bones. Cyclists can develop transient perineal numbness with long rides, and habitual long-distance cyclists have higher rates of pudendal neuralgia. Preventive measures include wide perineal cutout saddles, proper bike fit, padded shorts, and avoiding prolonged continuous riding without breaks.
What is the success rate of surgical pudendal nerve decompression?
Surgical decompression (Bautrant transgluteal technique and others) provides at least 50% pain relief in approximately 60–70% of properly selected patients with confirmed entrapment. Success is predicted by shorter symptom duration, definitive entrapment on imaging or electromyography, and good response to diagnostic nerve block. Results are less predictable than for other peripheral nerve entrapments, and surgery should only be considered after comprehensive conservative management has failed.