When an Infection Causes Testicular Pain

Which infections actually cause testicular pain?

When testicular pain turns out to be infection-related, it is almost always epididymitis, inflammation of the epididymis, the coiled tube behind the testicle. In sexually active people under about 35, chlamydia and gonorrhea are the most common causes, and both are common, curable bacterial infections in their own right 1Ref 1Centers for Disease Control and Prevention (2024).About Chlamydia.Supports that chlamydia is a common, curable bacterial STI that is frequently asymptomatic, and is treated with antibiotics. 2Ref 2Centers for Disease Control and Prevention (2024).About Gonorrhea.Supports that gonorrhea is a bacterial STI that can infect the genitals and is often asymptomatic..

Sudden, severe pain needs to be checked for testicular torsion first, since a twisted testicle threatens the organ within hours and cannot wait on a chlamydia or gonorrhea test — telling epididymitis from testicular torsion is a distinct and urgent question, covered in full detail elsewhere. This piece picks up once an infection has been identified or is strongly suspected as the cause.

Why does a genital infection end up causing pain in the testicle?

Chlamydia and gonorrhea are both bacterial infections that can affect the genital tract, and in men, that infection can travel from the urethra up into the epididymis, causing the swelling and tenderness that define epididymitis 1Ref 1Centers for Disease Control and Prevention (2024).About Chlamydia.Supports that chlamydia is a common, curable bacterial STI that is frequently asymptomatic, and is treated with antibiotics. 2Ref 2Centers for Disease Control and Prevention (2024).About Gonorrhea.Supports that gonorrhea is a bacterial STI that can infect the genitals and is often asymptomatic.. Neither infection announces itself reliably before that happens.

Both are frequently silent for weeks or months before any symptom appears, which is part of a much larger pattern — the asymptomatic sti majority is the norm across sexually transmitted bacterial infections generally, not the exception, and epididymitis is sometimes the first sign that an infection was ever present at all. That is exactly why testing, not guessing based on symptoms, is how the responsible infection actually gets identified.

How common are these infections?

Chlamydia and gonorrhea are two of the most frequently reported infections in the country: more than 1.6 million chlamydia cases and more than 600,000 gonorrhea cases were reported in the United States in 2023, with nearly half of all reported cases occurring in people aged 15 to 24 3Ref 3Centers for Disease Control and Prevention (2025).National Overview of STIs in 2023.Supports 2023 U.S. surveillance figures: over 1.6 million reported chlamydia cases and over 600,000 reported gonorrhea cases, with nearly half of all reported STI cases among people aged 15-24..

That scale is part of why clinicians test broadly rather than treating a single suspected infection and moving on — a positive test for one does not rule out the other, and both are common enough in the same age group that checking for both, plus syphilis and HIV, at the same visit is standard rather than excessive. A less common but real possibility is what is mycoplasma genitalium, a bacterium that can cause similar urethral and epididymal symptoms and sometimes surfaces only after chlamydia and gonorrhea have already been ruled out.

What does treatment actually involve, and how fast does it help?

Chlamydia is a curable bacterial infection treated with antibiotics, and gonorrhea-caused epididymitis is treated the same way, with a course chosen to cover whichever infection — or both — is confirmed or still suspected 1Ref 1Centers for Disease Control and Prevention (2024).About Chlamydia.Supports that chlamydia is a common, curable bacterial STI that is frequently asymptomatic, and is treated with antibiotics.. Pain and swelling usually start easing within a few days of starting treatment, though full resolution of tenderness can take longer.

Alongside antibiotics, supportive measures make the days in between more bearable: rest, scrotal support or snug underwear to limit movement, and ice can meaningfully reduce discomfort while the antibiotics take effect. Pain that isn't improving at all after a few days on treatment, or that gets noticeably worse, is worth a follow-up call rather than waiting out the original course on the assumption it will resolve on its own.

Sexual activity is generally best avoided until treatment is finished and any partner has also been treated, since continuing to have sex during that window is one of the more common ways the same infection ends up passing back and forth between two people. A clinician can give a clearer timeline for when that's safe to resume, based on which infection was involved and how treatment went.

What happens with a sexual partner?

When epididymitis is caused by chlamydia or gonorrhea, recent sexual partners need treatment too, whether or not they have symptoms, since both infections spread easily and are frequently silent in a partner as well. Expedited partner therapy — providing medication or a prescription for a partner without requiring their own clinic visit first — is legal in the large majority of states and the District of Columbia, though the details vary by jurisdiction 4Ref 4Centers for Disease Control and Prevention (2024).Legal Status of Expedited Partner Therapy (EPT).Supports that expedited partner therapy is permissible in the large majority of U.S. states plus DC, and that legal status varies by jurisdiction..

Where it's available, this removes one of the biggest practical barriers to actually getting a partner treated: needing a separate appointment before either person's timeline moves forward. Asking directly whether it's an option locally is worth doing at the same visit, rather than assuming a partner will schedule their own exam.

Can this happen again, and is there a way to prevent it?

For some people, particularly men who have sex with men and transgender women with a bacterial STI in the past year, a preventive option exists: doxy-PEP, a dose of the antibiotic doxycycline taken after sex, which current guidance supports offering to reduce the chance of a future chlamydia, gonorrhea, or syphilis infection 5Ref 5Bachmann LH, Barbee LA, Chan P, et al. (Centers for Disease Control and Prevention) (2024).CDC Clinical Guidelines on the Use of Doxycycline Postexposure Prophylaxis for Bacterial Sexually Transmitted Infection Prevention, United States, 2024.Supports the 2024 CDC doxy-PEP guideline: recommends counseling and offering doxycycline taken after sex to MSM and transgender women who had a bacterial STI in the prior 12 months, with STI testing every 3-6 months..

Doxy-PEP is not for everyone and is not a substitute for condoms or regular testing — it is one additional layer, recommended for a specific group at elevated recurrence risk, alongside STI testing roughly every three to six months for anyone using it 5Ref 5Bachmann LH, Barbee LA, Chan P, et al. (Centers for Disease Control and Prevention) (2024).CDC Clinical Guidelines on the Use of Doxycycline Postexposure Prophylaxis for Bacterial Sexually Transmitted Infection Prevention, United States, 2024.Supports the 2024 CDC doxy-PEP guideline: recommends counseling and offering doxycycline taken after sex to MSM and transgender women who had a bacterial STI in the prior 12 months, with STI testing every 3-6 months.. Whether it makes sense for a given person is worth raising directly at the same visit where epididymitis is treated, especially for anyone who has already had more than one bacterial STI.

What else should be checked at the same visit?

A visit for infection-related testicular pain is also a reasonable moment to ask for a fuller panel rather than testing only for the specific infection suspected. Syphilis screening is recommended for adults at increased risk of infection, and it's a fast blood test that's easy to add on when chlamydia and gonorrhea are already being checked 6Ref 6US Preventive Services Task Force (2022).Syphilis Infection in Nonpregnant Adolescents and Adults: Screening.Supports the 2022 USPSTF recommendation (Grade A) to screen for syphilis infection in asymptomatic, nonpregnant adolescents and adults at increased risk..

The same logic applies to HIV testing, which national guidance recommends at least once for everyone regardless of perceived risk. None of this requires a separate appointment — asking a clinician directly for a full panel, rather than only the test tied to the current symptom, is a reasonable and common request. Minors can access this kind of testing and treatment confidentially in every state, under minor sti consent laws that exist specifically so a lack of parental involvement doesn't become a barrier to care.