What are the possible causes of perineal tenderness between the anus and scrotum in a male?

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Perineal Tenderness Between Anus and Scrotum: Causes

The most common cause of tenderness in the perineal area between the anus and scrotum is pelvic floor myalgia (tender pelvic floor muscles), which frequently occurs as part of chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) or as an isolated musculoskeletal problem. 1

Primary Causes to Consider

Pelvic Floor Myalgia

The perineal body (the specific anatomical structure between anus and scrotum) is a key site for pelvic floor muscle tenderness 1. This represents:

  • Normal muscle tone with pain on palpation
  • Can exist alone or alongside CP/CPPS, interstitial cystitis/bladder pain syndrome (IC/BPS), or chronic scrotal content pain (CSCP)
  • Affects the majority of men with chronic pelvic pain 1

Clinical pearl: The perineal body can be palpated externally at the 6 o'clock position during examination, making it readily accessible for assessment 1.

Chronic Prostatitis/Chronic Pelvic Pain Syndrome (CP/CPPS)

This condition commonly presents with:

  • Bilateral perineal pain (not just unilateral)
  • Pain in multiple pelvic sites: perineum, lower abdomen, penis, or scrotum
  • May include dysuria or ejaculatory pain
  • Often associated with pelvic floor muscle dysfunction 1

Interstitial Cystitis/Bladder Pain Syndrome (IC/BPS)

Consider this when perineal tenderness accompanies:

  • Bladder-related discomfort (pain, pressure) lasting >6 weeks
  • Lower urinary tract symptoms
  • Pain worsening with bladder filling
  • Pain relief with voiding 1

Important overlap: 75% of men with chronic pelvic pain report bladder-related symptoms, indicating significant overlap between CP/CPPS and IC/BPS 1.

Less Common Neurogenic Causes

Pudendal Neuralgia

  • Neurogenic pain radiating to perineum and anus
  • Can mimic functional anorectal pain
  • Difficult to distinguish from muscular causes 2

Inferior Cluneal Nerve Involvement

  • Causes burning sensation on anal margin, scrotum, and medial buttock
  • Extends beyond typical pudendal nerve territory
  • Conflict points: sacrotuberal ligament and passage under ischium 3

Ilioinguinal Neuropathy

  • Pain radiating from inguinal region toward scrotum
  • Tenderness 2-3 cm medial and below anterior superior iliac spine
  • Can present with acute or chronic symptoms 4

Functional Anorectal Pain Syndromes

Levator Ani Syndrome

  • Tender puborectal muscle on digital rectal examination
  • Pain lasting >30 minutes (distinguishes from proctalgia fugax)
  • Treatment: reassurance, sitz baths, topical vasodilators, anal massage, biofeedback 2

Proctalgia Fugax

  • Sharp paroxysmal pain lasting <30 minutes
  • Distinguished by brief duration 2

Critical Diagnostic Approach

Initial evaluation must include:

  • Detailed pain characteristics: onset, duration, location, exacerbating/relieving factors
  • Associated genitourinary symptoms (voiding, sexual dysfunction)
  • Standardized pelvic floor examination with specific muscle palpation 1
  • Urinalysis and mid-stream urine culture to exclude infection 1
  • Assessment for psychosocial factors (depression, anxiety, stress) 1

Red flags requiring further workup:

  • Unilateral scrotal pain alone → consider CSCP 1
  • Hematuria → risk-stratified hematuria evaluation
  • Neurologic symptoms → consider MRI of lumbosacral spine 1
  • Urethral discharge with post-void dribbling → pelvic MRI for prostatic utricle cyst 1

Common Pitfalls

  1. Assuming infection without evidence: Avoid repeated antibiotic courses without documented infection 5
  2. Missing pelvic floor dysfunction: 93% of patients with chronic testicular pain have symptoms of pelvic floor dysfunction 6
  3. Overlooking younger patients: Pelvic floor overactivity is significantly more common in younger men with chronic pelvic pain 6
  4. Ignoring multisystem symptoms: Look beyond urologic symptoms to gastrointestinal, musculoskeletal, and neurologic complaints 1

Bottom line: Perineal tenderness between anus and scrotum most commonly reflects pelvic floor myalgia, either isolated or as part of CP/CPPS. A thorough pelvic floor examination with specific attention to the perineal body is essential for diagnosis, and infection should be documented before prescribing antibiotics.

References

2
Research

[Anorectal and perineal pain].

Therapeutische Umschau. Revue therapeutique, 2021

3
Research

Perineal pain and inferior cluneal nerves: anatomy and surgery.

Surgical and radiologic anatomy : SRA, 2008

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