Version July 2025
| Acute bacterial epididymitis |
| Secondary to sexually transmitted infection (gonorrhea, chlamydia; less commonly mycoplasma, ureaplasma) |
| Secondary to urinary tract infection (E. coli and other enteric bacteria) |
| Nonbacterial infectious epididymitis¶ |
| Viral (cytomegalovirus infection) |
| Parasitic (toxoplasmosis) |
| Noninfectious epididymitis |
| Traumatic |
| Autoimmune |
| Amiodarone-induced |
| Vasculitis-associated |
| Idiopathic |
* Pathogens listed are examples and not an exhaustive list. Refer to related UpToDate topics on epididymitis for additional content.
¶ Viral and parasitic epididymitis occur primarily in immunocompromised patients.