21yr old male with fever and one sided testicular swelling
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testicular torsion AND epididymitis
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CDC acute epididymitis STI treatment guidelines testicular torsion urgent referral
Fever with one-sided testicular swelling needs urgent in-person assessment today, preferably an emergency department or urgent urology service.
A common cause at age 21 is acute epididymitis/epididymo-orchitis, often due to an STI such as chlamydia or gonorrhea, or less often a urinary infection. It can cause one-sided pain, swelling, tenderness, redness, fever, urinary burning, or urethral discharge. However, testicular torsion must be ruled out urgently, because it can threaten the testicle within hours and can sometimes coexist with misleading inflammatory symptoms. CDC guidance advises immediate urologic evaluation when sudden severe unilateral pain is present or the diagnosis is uncertain.
Go to the ER now, rather than waiting for an appointment, if any of these apply:
- sudden onset or severe/worsening pain
- nausea or vomiting
- a high-riding, horizontal, or very tender testicle
- rapidly increasing swelling/redness
- fever with chills, looking or feeling very unwell
- pain after injury, or inability to pass urine
A clinician may examine him, do urine and STI tests, and arrange a scrotal Doppler ultrasound if needed. Do not self-start leftover antibiotics, as the correct treatment depends on the cause and testing is important. While travelling for care, supportive underwear and paracetamol/acetaminophen or ibuprofen can help if normally safe for him, but should not delay assessment.
treatment for epididymitis/epididymo orchitis
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CDC epididymitis recommended regimens ceftriaxone doxycycline levofloxacin 2026
For a 21-year-old with fever and one-sided testicular swelling, treatment should begin only after urgent assessment to rule out testicular torsion, abscess, or severe infection. Sudden or severe pain, nausea/vomiting, or a high-riding testicle means go to the emergency department immediately.
If a clinician diagnoses acute epididymitis or epididymo-orchitis, treatment is based on the likely source:
| Likely cause | Usual adult regimen |
|---|---|
| Chlamydia/gonorrhea likely - common in sexually active men <35 | Ceftriaxone 500 mg IM once plus doxycycline 100 mg orally twice daily for 10 days |
| STI plus possible enteric organisms, such as with insertive anal sex | Ceftriaxone 500 mg IM once plus levofloxacin 500 mg orally once daily for 10 days |
| Enteric/urinary bacteria only, after gonorrhea is reliably excluded | Levofloxacin 500 mg orally once daily for 10 days |
These are the current CDC regimens for acute epididymitis. Choice should be made by a clinician after sexual history, urine testing, and STI NAAT testing, with adjustment for allergies, kidney disease, local resistance, culture results, and drug interactions. See the CDC epididymitis guideline.
Supportive treatment
- Rest and avoid strenuous activity.
- Scrotal elevation/supportive underwear.
- Ice packs wrapped in cloth, 15-20 minutes at a time.
- Pain relief such as paracetamol/acetaminophen or an NSAID such as ibuprofen, if safe for him.
- Symptoms may take days to improve; swelling can persist for weeks.
If STI-related infection is suspected or confirmed
- Test for gonorrhea, chlamydia, HIV, and syphilis.
- No sex until treatment is complete, symptoms have resolved, and partners have been treated.
- Sexual partners from the preceding 60 days need assessment and presumptive treatment where appropriate.
- Repeat chlamydia/gonorrhea testing in about 3 months is generally recommended because reinfection is common.
Return urgently or admit to hospital if fever is high or persistent, pain/swelling worsens, vomiting prevents oral medication, he appears systemically unwell, an abscess is suspected, or there is no improvement within 72 hours. Persistent swelling after antibiotics also needs urology review to exclude abscess, infarction, tumor, tuberculosis, or another diagnosis.
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