Testicle Pain: What Might Be Causing It and When to Act Fast

When is testicular pain an emergency?

Testicular torsion is the most time-critical cause of testicular pain. It happens when the spermatic cord twists and cuts off blood supply to the testicle. Without surgery, the testicle can be permanently lost.

Salvage rates decline sharply with time. Research on adolescent males found that symptom duration and the degree of cord twisting are the strongest predictors of whether a testicle can be saved 1Ref 1Howe AS, Vasudevan V, Kongnyuy M, et al. (2017).Degree of twisting and duration of symptoms are prognostic factors of testis salvage during episodes of testicular torsion.Symptom duration and degree of cord twisting are the strongest prognostic factors for testicular salvage; 15 hours of symptoms and 860 degrees of torsion yields approximately a 50% salvage probability. Separate data show salvage rates near 97% when surgery happens within six hours of symptom onset, dropping to roughly 79% at seven to twelve hours and below 50% beyond twelve hours 2Ref 2Ramachandra P, Palazzi KL, Holmes NM, Marietti S (2015).Factors influencing rate of testicular salvage in acute testicular torsion at a tertiary pediatric center.Symptom duration under six hours was the strongest predictor of successful salvage (OR 22.5); salvage was possible in 55.3% of 114 pediatric cases overall. Because of this steep drop-off, emergency evaluation is the only appropriate response — never waiting to see if the pain resolves.

Torsion is most common in adolescents and young men, though it can happen at any age. The pain typically comes on suddenly and severely, sometimes waking someone from sleep, and is often accompanied by nausea, vomiting, and a testicle that sits higher than usual or lies at an unusual angle. A congenital variant called the "bell-clapper deformity" — where the tunica vaginalis incompletely anchors the testicle — increases the risk; because this variant is bilateral in a high proportion of cases, surgeons routinely fix the opposite testicle at the time of torsion surgery to prevent future torsion on that side 3Ref 3Schick MA, Sternard BT (2023).Testicular Torsion.Bell-clapper deformity is bilateral in a high proportion of cases; routine contralateral orchiopexy is recommended at the time of torsion surgery.

If you have sudden, severe testicular pain, especially if you are under 35: go to the emergency department now. Do not rely on a description of symptoms to rule out torsion.

What are the most common non-emergency causes?

Epididymitis is inflammation of the epididymis — the coiled tube that runs behind the testicle. It is one of the most common causes of scrotal pain in adults 4Ref 4Centers for Disease Control and Prevention (2021).Epididymitis — STI Treatment Guidelines 2021.Epididymitis is one of the most common causes of scrotal pain in adults; chlamydia and gonorrhea are leading causes in sexually active men; current treatment is ceftriaxone plus doxycycline; partners should be evaluated within 60 days of symptom onset. Unlike torsion, it typically develops gradually over days, causing a dull ache, warmth, and swelling that are usually worse at the back of the testicle.

In sexually active men under 35, sexually transmitted infections — particularly chlamydia and gonorrhea — are a leading driver 4Ref 4Centers for Disease Control and Prevention (2021).Epididymitis — STI Treatment Guidelines 2021.Epididymitis is one of the most common causes of scrotal pain in adults; chlamydia and gonorrhea are leading causes in sexually active men; current treatment is ceftriaxone plus doxycycline; partners should be evaluated within 60 days of symptom onset. In older men, urinary bacteria are more often responsible. The CDC's current STI treatment guidelines recommend ceftriaxone plus doxycycline for epididymitis likely caused by an STI, and emphasize that partners should be evaluated and treated if sexual contact occurred within the 60 days before symptoms began 4Ref 4Centers for Disease Control and Prevention (2021).Epididymitis — STI Treatment Guidelines 2021.Epididymitis is one of the most common causes of scrotal pain in adults; chlamydia and gonorrhea are leading causes in sexually active men; current treatment is ceftriaxone plus doxycycline; partners should be evaluated within 60 days of symptom onset. Untreated epididymitis can lead to abscess formation or impaired fertility.

Orchitis — inflammation of the testicle itself — can occur alongside epididymitis or separately, sometimes following a viral infection such as mumps. It causes pain, swelling, and tenderness of the testicular body.

Varicocele is an enlargement of the veins inside the scrotum, similar to varicose veins in the leg. It is present in roughly 15% of men in the general population and in a higher proportion of men being evaluated for infertility — making it the most common correctable cause of male infertility 5Ref 5Lundy SD, Sabanegh ES Jr (2017).Varicocele management for infertility and pain: A systematic review.Varicocele is present in approximately 15% of men in the general population and is the most common correctable cause of male infertility; approximately 90% of patients experience pain improvement after varicocelectomy. Most varicoceles are asymptomatic, but some produce a dull ache that worsens with prolonged standing or physical exertion. A left-sided varicocele is considerably more common than a right-sided one because of differences in venous drainage anatomy.

What other conditions can cause testicular or scrotal pain?

Kidney stones can cause referred pain that radiates from the flank all the way to the testicle, even when the testicle itself is entirely normal. Waves of colicky pain, possible blood in the urine, and a history of kidney stones all point in this direction.

Inguinal hernia — tissue pushing through a weakness in the lower abdominal wall — is common in men and can cause referred scrotal or testicular discomfort, especially with straining, lifting, or coughing. A visible or palpable groin bulge is the classic accompanying sign.

Hydrocele is a fluid collection around the testicle that can create a sensation of heaviness or fullness rather than sharp pain.

Testicular cancer most often presents as a painless lump, but some men notice a dull ache or feeling of heaviness. It is the most common solid tumor in men aged 15 to 35 6Ref 6National Cancer Institute SEER Program (2024).Cancer Stat Facts: Testicular Cancer.Testicular cancer is the most common solid tumor in men aged 15–35; median diagnosis age 33; 5-year survival rate above 94%; incidence rate 6.1 per 100,000 men per year (2019–2023). SEER data show a 5-year survival rate above 94% overall when diagnosed, which reflects how well it responds to treatment when caught — but early detection depends on someone actually seeking evaluation 6Ref 6National Cancer Institute SEER Program (2024).Cancer Stat Facts: Testicular Cancer.Testicular cancer is the most common solid tumor in men aged 15–35; median diagnosis age 33; 5-year survival rate above 94%; incidence rate 6.1 per 100,000 men per year (2019–2023). Any persistent scrotal discomfort or lump deserves a clinical exam partly to rule this out.

Muscle strain or trauma from physical activity can cause localized scrotal soreness that typically resolves with rest.

How does a clinician evaluate testicular pain?

The pattern of onset is the most important piece of information. A sudden, severe onset in a young man demands immediate imaging and possibly surgical exploration regardless of how the pain subsequently evolves — in some cases of torsion, the pain can partially ease as ischemic changes progress, which is not reassurance.

Scrotal ultrasound with color Doppler is the primary imaging tool. It evaluates blood flow to the testicle (the critical question in torsion), identifies epididymitis, orchitis, hydrocele, varicocele, or a mass. A 2025 meta-analysis of 42 studies found color Doppler ultrasound has a sensitivity of 95% and specificity of 98% for testicular torsion 7Ref 7Alexander CE, Warren H, Light A, et al. (2025).Ultrasound for the Diagnosis of Testicular Torsion: A Systematic Review and Meta-analysis of Diagnostic Accuracy.Color Doppler ultrasound has a sensitivity of 95.3% and specificity of 98.3% for testicular torsion across 42 studies and 4,422 participants; preserved blood flow does not completely exclude torsion. Importantly, preserved blood flow on Doppler does not completely exclude torsion — clinical suspicion in the right setting should prompt surgical evaluation even with a normal ultrasound.

Other tests a clinician may order include: - Urinalysis and urine culture to detect urinary tract infection or signs of kidney stones - STI testing (NAAT for chlamydia and gonorrhea) for sexually active men, given that STIs are a leading cause of epididymitis in men under 35 - Complete blood count to look for signs of infection or systemic inflammation

What helps the clinician most: when the pain started and exactly how it started (sudden vs. gradual), whether it is constant or comes and goes, associated symptoms (nausea, fever, urinary changes, penile discharge), recent sexual history, and any prior episodes.

Does age change what is most likely?

Age shifts the probability of each cause meaningfully:

• Adolescents and young men (under 25): torsion is the primary concern for sudden-onset pain; testicular cancer risk peaks in the 20s and 30s
• Sexually active men under 35: STI-driven epididymitis (chlamydia, gonorrhea) is the leading infectious cause; testing and partner notification are part of treatment
• Men over 35: urinary bacteria and prostate-related causes are more common drivers of epididymitis; torsion is less likely but not impossible
• Any age: a hard lump on the testicle — with or without pain — always warrants evaluation