Overview
Testicular pain can have several causes, including infection, injury and twisting of the testicle on its blood supply (torsion). Sudden severe pain requires emergency assessment immediately; do not wait for a time limit. Other unexplained pain, swelling or a lump also needs medical assessment.
How common is it?
Testicular pain accounts for approximately 1% of all male GP consultations. Epididymo-orchitis is the most common cause in adults over 35. Testicular torsion is most common in adolescent boys (peak age 13 to 16) but can occur at any age.
Causes and risk factors
The testis, epididymis, and surrounding structures have several causes of pain. Emergency causes must be excluded first.
Common risk factors
- Testicular torsion: twisting that interrupts blood flow and needs emergency assessment immediately
- Epididymo-orchitis: bacterial infection from STIs (Chlamydia in under 35s) or urinary tract organisms (over 35s)
- Torsion of the testicular appendix: twisting of a small embryological remnant — benign but painful
- Trauma: direct blow to the testis
- Varicocele: dilated veins in the scrotum causing dull ache
- Hydrocele: fluid accumulation around the testis
- Testicular cancer: typically painless but may cause discomfort
- Referred pain from kidney stones, inguinal hernia, or lumbar nerve root compression
Symptoms
- Sudden severe testicular pain (torsion — surgical emergency)
- Gradually developing pain with swelling and redness (epididymo-orchitis)
- Dull ache that worsens throughout the day or with prolonged standing (varicocele)
- Pain after trauma
- A smooth swelling above the testis that transilluminates (hydrocele)
- A firm, painless lump within the testis (until proven otherwise: testicular cancer)
When to see a doctor
Go to an emergency department immediately for sudden severe testicular pain, pain with nausea or vomiting, or pain that persists at rest. Testicular torsion is one possible cause and needs rapid treatment. Do not wait to see whether it improves or drive yourself. Seek prompt medical advice for a lump, swelling or other changes.
Diagnosis
Testicular torsion: clinical assessment. Doppler ultrasound confirms absent blood flow (torsion) vs increased flow (orchitis) but must not delay surgery if torsion is clinically suspected. Urine and urethral swabs for STIs.
Treatments
Emergency surgical detorsion
Immediate surgical exploration for suspected testicular torsion. Both testicles are fixed to prevent future torsion (orchidopexy), as the contralateral side may have the same anatomical predisposition.
Antibiotics for epididymo-orchitis
A clinician chooses antibiotics after assessing the likely infection and relevant tests. Sexual exposure, urinary symptoms, allergies and local guidance matter; age alone does not determine treatment. Partners may need testing or treatment when a sexually transmitted infection is involved.
Supportive care
Scrotal support, NSAID analgesia, and rest for orchitis and trauma. Varicocele treatment (embolisation or surgery) for symptomatic varicoceles, particularly if affecting fertility.
Self-care and lifestyle
- Never dismiss sudden acute testicular pain as minor — always seek immediate assessment
- Monthly testicular self-examination to detect changes early
- Wear protective cups during contact sports
Prevention
No reliable prevention for torsion (though orchidopexy of the contralateral testis at the time of detorsion is protective). STI prevention reduces epididymo-orchitis risk.
Sources for targeted updates
Updated: 24 October 2026. Specific treatment, safety or key-fact statements corrected in this update. This update covers the named sections; a full review of the remaining guide is pending.