Scrotal Pain / Swelling Algorithm

The full reasoning pathway — the priority is excluding torsion (and Fournier's/strangulated hernia); then work through infective, vascular and referred causes, treat by diagnosis and safety-net. Torsion is a clinical diagnosis — explore, don't wait for imaging.StartDecisionInvestigateActionReferStop / Admit

PresentationScrotal pain

Acute vs chronic, speed of onset, urinary/STI symptoms, trauma, swelling, systemic upset. Examine testes, epididymis, cord, cremasteric reflex, hernial orifices, skin. Age <25 + sudden pain = torsion until proven otherwise.

Step 1 · Safety — surgical emergenciesTorsion / Fournier's / strangulated hernia?

Testicular torsion — sudden severe pain, nausea/vomiting, high-riding/horizontal testis, absent cremasteric reflex, age <25 (but any age)
Fournier's gangrene — necrotising fasciitis: systemically unwell (often diabetic), skin necrosis/crepitus, pain out of proportion
Strangulated inguinoscrotal hernia — irreducible tender lump + obstruction

YES — emergency

Stop · 999Emergency surgery

Suspected torsion → immediate surgical exploration (testicular salvage falls sharply after 6 h — do NOT delay for ultrasound). Fournier's → emergency debridement + IV antibiotics. Strangulated hernia → emergency surgery.

NO — work up cause

Step 2 · InvestigateUrine + swabs ± USS

Urinalysis/MSU, first-pass urine NAAT + urethral swab if STI risk; consider Doppler USS (cause unclear or chronic). Examine for hernia and referred sources.

Step 3 · which cause?

Epididymo-orchitis

Commonest non-surgical

Gradual onset, tender epididymis, dysuria/discharge, fever; Prehn's positive (relief on elevation). STI (<35) vs enteric/UTI organisms (>35).

Chronic scrotal pain

Investigate

Varicocele, hydrocele, spermatocele, post-vasectomy pain, chronic orchalgia; USS to characterise.

Referred

Not in the scrotum

Renal/ureteric colic, inguinal hernia, nerve entrapment (ilioinguinal/genitofemoral), AAA — examine the abdomen and loins.

Step 7 · treat by cause

Step 7 · Action — cause-directed treatmentAntibiotics, analgesia, support

Epididymo-orchitis — suspected STI (<35): ceftriaxone 1 g IM stat + doxycycline 100 mg BD 10–14 days; refer GUM + partner notification.
Epididymo-orchitis — enteric/UTI organisms (>35, low STI risk): ofloxacin 200 mg BD or levofloxacin 14 days; NSAID + scrotal support.
Chronic pain: analgesia, scrotal support, treat the specific lesion; chronic orchalgia → urology/pain pathway.
Referred: treat the source (renal colic pathway, hernia repair).

Step 6 · escalation thresholds

Step 6 · ReferEscalation thresholds

999 / emergency torsion, Fournier's gangrene, strangulated hernia, abscess.
GUM suspected STI epididymo-orchitis (partner notification). Urology chronic scrotal pain, varicocele/hydrocele needing intervention, failure to improve.
Reassess promptly if a presumed epididymo-orchitis does not settle — reconsider torsion or abscess.

Step 8 · self-care & prevention

Step 8 · Self-care & preventionSymptom relief & risk reduction

Scrotal support, rest, NSAIDs and ice for epididymo-orchitis · complete the antibiotic course · safer-sex advice and partner treatment for STI cause · hydration/stone-prevention if referred renal colic · realistic expectations for chronic orchalgia (multimodal, may take months).

Step 9 · safety-net

Step 9 · Safety-net & follow-upWhen to come back

999 / same-day if pain becomes sudden and severe, the testis rides high, or there is skin change/crepitus + feeling very unwell (Fournier's). Review epididymo-orchitis at 48–72 h — if not improving, re-examine and consider torsion, abscess or the wrong organism; arrange USS. Chase STI/swab results and partner notification.

⚠️ Torsion is a clinical diagnosis — explore, don't wait for imaging. Salvage rates fall sharply after 6 hours, and a normal Doppler does not exclude it. And Fournier's gangrene is a surgical emergency: a systemically unwell (often diabetic) man with scrotal pain, swelling and skin changes needs immediate debridement.

Safety

Step 1 — Screen for Emergencies: Testicular Torsion & Can't-Miss Diagnoses

Done

Testicular torsion is a surgical emergency. Any acute scrotal pain must exclude torsion FIRST — time to surgery determines testicular viability.

Sudden severe scrotal pain Onset <6h, unilateral, severe, may radiate to groin/abdomen → 999 Emergency suspected torsion

High-riding testicle Horizontal lie or retracted testis, absent cremasteric reflex → 999 Emergency urology

Age <25, acute pain Peak torsion age 12–18y but can occur at any age → 999 Emergency do not delay for USS

Systemic sepsis features Fever, rigors, haemodynamic compromise → Same-day emergency Fournier's gangrene / severe epididymo-orchitis

Hard, fixed, painless testicular mass Irregular, non-transilluminable lump → 2WW Urology testicular cancer

Torsion of appendix testis Localised superior pole tenderness, blue-dot sign → Same-day urology if diagnosis uncertain

Inguino-scrotal hernia — incarcerated Irreducible lump, vomiting, abdominal pain → 999 Emergency bowel strangulation

Trauma + expanding haematoma Following injury, rapidly enlarging swelling → Same-day urology testicular rupture

Testicular torsion accounts for 25% of acute scrotal pain referrals. Viability falls sharply: >90% salvage if detorsion within 6h, <10% after 24h (EAU Guidelines). The clinical window is narrow. USS can be falsely reassuring and should NEVER delay surgical exploration if clinical suspicion is high. Testicular cancer has a lifetime risk of ~1 in 250 men; painless hard lumps must not be attributed to benign causes without urgent imaging (NICE NG12).

Diagnose

Step 2 — History-Based Probability: Refine the Differential

Done

Use history to differentiate epididymo-orchitis from torsion from varicocele/hydrocele/hernia before examination.

Onset

Sudden (<1h) → torsion / trauma. Gradual (hours–days) → epididymo-orchitis. Insidious (weeks) → malignancy / varicocele

Age

<25y: torsion most likely. 20–40y: STI-related epididymitis. >35y: enteric organisms, UTI association. Any age: malignancy

Sexual history

New partner, unprotected sex → Chlamydia/Gonorrhoea epididymitis. MSHR as appropriate

Urinary symptoms

Dysuria, frequency → UTI/epididymitis. Absent in torsion

Previous episodes

Intermittent: consider intermittent torsion, varicocele

Swelling character

Transilluminates → hydrocele. Reduces lying down → hernia. Bag of worms → varicocele (often left-sided)

Systemic features

Fever → epididymo-orchitis, Fournier's. Weight loss/sweats → TB, malignancy

Recent illness / mumps

Post-viral orchitis. Mumps orchitis rare post-MMR vaccination

History alone can guide the urgency of referral before examination. Studies show that acute onset + young age + absent cremasteric reflex has >90% sensitivity for torsion (Barbosa et al., 2013). STI-related epididymitis is the commonest cause in sexually active men aged 18–35; missing this leads to infertility, chronic pain syndrome, and onward transmission. A thorough sexual history is a core RCGP competency and must be taken sensitively.

Diagnose

Step 3 — Classification of Scrotal Pathology

Done

Classify into the main diagnostic categories to guide investigation and management pathway.

Testicular Torsion

Sudden onset, absent cremasteric reflex, high-riding testis. Bell-clapper deformity. Surgical emergency — explore same-day. Age peak 12–18y

Epididymo-orchitis

Gradual onset, tender epididymis ± testis, fever. <35y: STI (Chlamydia, Gonorrhoea). >35y: Enterobacteriaceae (E. coli). Treat empirically then refine by MSU/NAAT

Hydrocele

Painless, transilluminates, surrounds testis. Primary (idiopathic) or secondary (infection, tumour). If secondary cause suspected → USS

Varicocele

"Bag of worms" palpable standing, especially left-sided. May cause aching. Grade I–III. Associated with subfertility — refer if bilateral or right-sided (secondary cause)

Epididymal cyst

Smooth, separate from testis, transilluminates. Reassure if confirmed by USS. No treatment unless symptomatic

Inguinal hernia

Lump extending to groin, reducible lying down, cough impulse. Refer elective if asymptomatic; same-day if irreducible

Testicular malignancy

Hard, irregular, non-tender (or mildly tender), doesn't transilluminate. Peak age 15–40y. NSGCT > seminoma. 2WW referral

Chronic orchialgia

Persistent >3 months, no structural cause identified. Complex pain pathway. Refer urology ± pain team

Classification determines the entire management pathway. Epididymo-orchitis has two distinct microbiology pathways (STI vs urinary tract organisms) requiring different antibiotic choices. Varicocele is found in 35–40% of men investigated for subfertility — identifying it enables timely referral. Testicular cancer has a 95%+ 5-year survival if caught stage I, making early 2WW referral life-saving. Right-sided varicocele should always prompt USS to exclude renal/retroperitoneal mass compressing the right gonadal vein.

Diagnose

Step 4 — Targeted Examination

Done

Examine standing then supine. Ensure privacy, chaperone offered and documented.

Vital signs

Temp, HR, BP, SpO₂ → Fever + tachycardia → epididymo-orchitis / Fournier's gangrene → escalate urgency

Inguinal exam

Palpate inguinal canal, cough impulse → hernia. Lymphadenopathy → infection, malignancy

Scrotal skin

Erythema + crepitus → Fournier's gangrene (emergency). Scrotal oedema → epididymo-orchitis. Skin changes → dermatitis, infection

Testicular position

High-riding, horizontal lie → torsion. Normal position doesn't exclude

Cremasteric reflex

Stroke inner thigh → testis should rise. Absent → torsion (sensitivity 99%, but not 100%)

Testis palpation

Normal smooth ovoid. Hard/irregular → malignancy. Diffuse tender → orchitis. Epididymis tenderness posteriorly → epididymitis. Prehn's sign (pain relief on elevation) unreliable — do not use to exclude torsion

Transillumination

Torch in dark room → glows red → hydrocele or epididymal cyst. Does not transilluminate → solid lesion or haematocele

Standing exam

Dilated veins standing, disappear lying → varicocele (left side predominant)

The cremasteric reflex has ~99% sensitivity for torsion when absent — its presence is reassuring but not definitive. Prehn's sign (historically taught as differentiating epididymitis from torsion) has been shown to be unreliable (Barada et al.) and should not alter management. Transillumination is a key clinical skill — a glowing swelling almost always reflects a benign fluid collection. Fournier's gangrene is a life-threatening necrotising fasciitis of the perineum — even mild skin changes with systemic upset warrant immediate escalation.

Diagnose

Step 5 — Investigations

Done

Do NOT delay surgical referral for torsion to obtain investigations. Investigations guide management of non-emergency presentations.

Urinalysis + MSU 1st line

Dipstick + culture if epididymo-orchitis suspected. Positive nitrites/WBC → bacterial. Negative doesn't exclude STI-related disease

NAAT swab 1st line STI

Urethral or first-void urine for Chlamydia trachomatis + Neisseria gonorrhoeae if age <35y or sexual risk factors. Refer GUM for full STI screen ideally

Scrotal USS Doppler Urgent

If diagnosis uncertain after examination. Shows blood flow (torsion = absent), epididymitis, hydrocele, varicocele, tumour. Do NOT delay surgery for USS if torsion clinically suspected

Tumour markers 2WW bloods

AFP, β-hCG, LDH if testicular malignancy suspected. Order before referral. Note: markers normal in 20% of testicular cancers

FBC, CRP, U&Es

If systemic sepsis, severe epididymo-orchitis, or immunocompromised. Not routine for mild presentations

STI screen

HIV, Hep B/C, Syphilis serology if referring to GUM. Offer to all sexually active men

NOT needed

CT/MRI not first-line in primary care. Testicular biopsy not in primary care. Avoid USS if clinical torsion is certain — go straight to theatre

Scrotal USS Doppler has 82–98% sensitivity for torsion but false negatives occur — clinical suspicion overrides a "normal" USS. NAAT testing for STIs is essential as Chlamydia trachomatis is the commonest cause of epididymitis in men under 35 (PHE data). Culture alone misses Chlamydia. Tumour markers (AFP/βHCG) ordered before orchiectomy are critical for staging and monitoring response to treatment — a key quality marker in testicular cancer pathways (NICE NG12 / BOA guidelines).

Refer

Step 6 — Referral Criteria and Pathways

Done

999 Emergency

Suspected testicular torsion (any age, acute onset). Fournier's gangrene. Incarcerated inguinal hernia. Haemodynamic instability

Same-day urology

Testicular trauma + haematoma. Suspected torsion of appendix testis where diagnosis uncertain. Acute epididymo-orchitis + systemic sepsis not improving with oral antibiotics in 48h

2WW Urology

Any solid testicular mass. Unexplained hydrocoele in age >40y. Rapidly enlarging testicular swelling. AFP/βHCG raised in scrotal swelling

Routine Urology

Symptomatic varicocele (pain, or subfertility). Large symptomatic hydrocele. Chronic orchialgia >3 months unresponsive to treatment. Epididymal cyst requiring treatment

GUM referral

STI-related epididymitis for contact tracing, full STI screen, partner notification. All NAAT positive results

Primary care manage

Uncomplicated epididymo-orchitis responding to antibiotics. Confirmed benign epididymal cyst (USS confirmed). Asymptomatic small varicocele in men not seeking fertility

Torsion is time-critical — every 30-minute delay reduces salvage rates. The 2WW pathway for testicular malignancy is mandated by NICE NG12; GP compliance with 2WW referral for solid scrotal masses is audited and a significant quality indicator. GUM referral for STI-related epididymitis ensures contact tracing and prevention of onward transmission — Chlamydia is the most common STI in England (PHE 2023). Varicocele-associated subfertility affects up to 35% of men with secondary infertility — early referral optimises fertility outcomes.

Treat

Step 7 — Treatment Pathways by Diagnosis

Done

Epididymo-orchitis is the main primary-care-treatable condition. Antibiotic choice depends on likely organism.

Age <35y / STI risk

Ceftriaxone + Doxycycline GUM refer

Ceftriaxone 500mg IM stat (ideally GUM) + Doxycycline 100mg BD PO × 14 days. Covers Chlamydia and Gonorrhoea. Avoid fluoroquinolones (Gonorrhoea resistance)

Age >35y / UTI associated

Ofloxacin NICE CKS

Ofloxacin 200mg BD PO × 14 days. Alternative: Levofloxacin 500mg OD × 10 days. Check local resistance patterns. Send MSU first

Analgesia (all)

NSAIDs / Paracetamol

Ibuprofen 400mg TDS with food (if no contraindication) + Paracetamol 1g QDS. Scrotal support / elevation. Ice pack (wrapped)

HydroceleWatchful waiting if small/asymptomatic. Refer urology if large, symptomatic, or secondary cause suspected (USS first)

VaricoceleSupportive care (scrotal support, analgesia). Refer if symptomatic, bilateral, or subfertility concerns. Surgical or radiological embolisation in secondary care

Epididymal cystReassure if USS confirmed benign. No GP treatment required. Refer urology if symptomatic for excision

Chronic orchialgiaNSAIDs + scrotal support 1st line. Consider nerve block referral, low-dose amitriptyline 10mg ON if neuropathic component. MDT approach. Urology ± pain team referral

BHIVA/BASHH 2022 guidelines recommend against fluoroquinolone monotherapy in younger men due to rising Gonorrhoea resistance — ceftriaxone IM covers this. PHE antimicrobial resistance data shows >25% Gonorrhoea resistance to ciprofloxacin. For over-35s, fluoroquinolones remain appropriate as STI organisms are less likely and Enterobacteriaceae predominate. Duration of 14 days is important to prevent progression to chronic epididymitis or infertility. Scrotal elevation reduces lymphatic congestion and accelerates recovery (physiological rationale).

Lifestyle

Step 8 — Non-Pharmacological & Preventive Interventions

Done

Scrotal support Supportive underwear or jockstrap. Reduces traction pain in epididymo-orchitis and varicocele. Simple, effective

Sexual health Consistent condom use. Reduces STI-related epididymitis recurrence. Refer to GUM for contact tracing and STI prevention advice

Testicular self-examination Monthly self-check post-shower. Teach three-finger technique. Enables early detection of malignancy — report new lumps promptly

Rest & activity modification Avoid heavy lifting and cycling during acute epididymo-orchitis. Resume gradually once pain settles (>2 weeks typically)

Heat avoidance For varicocele / subfertility: avoid hot baths, tight underwear, prolonged sitting. Scrotal cooling may modestly improve sperm quality

Fertility counselling If bilateral varicocele or post-orchitis: refer early to fertility services. Cryopreservation discussion if pre-treatment for cancer

Smoking cessation Smoking impairs sperm quality and testicular blood flow. Offer referral to NHS Stop Smoking service

Alcohol reduction Excess alcohol impairs spermatogenesis. AUDIT-C score; brief intervention if score ≥5

Testicular self-examination (TSE) is not formally recommended as a population screening tool (USPSTF) but remains valuable in primary care to empower men to present early with new lumps — the majority of men presenting with testicular cancer report finding it themselves. Fertility considerations are important: epididymo-orchitis can cause obstructive azoospermia; the window for intervention is limited. Men diagnosed with testicular cancer should be offered sperm banking before any treatment. Addressing sexual health holistically, including partner treatment, reduces reinfection rates.

Safety

Step 9 — Follow-Up, Monitoring & Safety-Netting

Done

48–72h review

Epididymo-orchitis: confirm improving with antibiotics. If worsening → escalate to same-day urology. Review MSU / NAAT results

2-week review

Confirm antibiotic course completion. Resolution of symptoms? Residual swelling → arrange scrotal USS. STI test results if pending

6-week review

Persistent swelling or pain at 6 weeks → USS to exclude malignancy or abscess formation. Refer urology if no resolution

Safety-net 999

Sudden severe scrotal pain (torsion). Scrotal skin necrosis / blackening (Fournier's). Collapse, haemodynamic instability

Safety-net same-day GP

Fever not settling after 48h antibiotics. Increasing swelling despite treatment. New systemic symptoms. Unable to tolerate oral antibiotics

Fertility follow-up

Offer semen analysis 3–6 months post-orchitis if fertility concerns raised. Refer fertility services if abnormal

2WW safety net

Any new solid, painless testicular lump found at follow-up → 2WW urology referral regardless of previous negative USS

Chronic orchialgia

Review at 6–8 weeks; if not improving refer urology. Avoid indefinite repeat prescriptions without specialist input

Early follow-up for epididymo-orchitis is essential because: abscess formation occurs in 3–8% of cases (requiring drainage), and incomplete antibiotic courses risk chronic epididymitis and infertility. Persistent swelling at 6 weeks must trigger USS because secondary hydroceles and testicular tumours can present sub-acutely — testicular cancer can initially appear as "epididymo-orchitis." The safety-netting script for torsion is the most critical: providing clear written instructions for when to call 999 is a patient safety imperative and RCGP examination competency.