Orchitis can be caused by a bacterial or viral infection. Sometimes a cause of orchitis can't be determined (idiopathic orchitis).
Most often, bacterial orchitis is the result of epididymitis. Epididymitis usually is caused by an infection of the urethra or bladder that spreads to the epididymis.
Often, the cause of the infection is an STI. Other causes of infection may be related to having been born with abnormalities in your urinary tract or having had a catheter or medical instruments inserted into your penis.
Viral orchitis is usually caused by the mumps virus. About one-third of males who contract the mumps after puberty develop orchitis, usually four to seven days after onset of the mumps.
Sep. 09, 2014
- Ferri FF. Ferri's Clinical Advisor 2015: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2015. https://www.clinicalkey.com. Accessed July 18, 2014.
- AskMayoExpert. What are the causes or types of scrotal masses? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
- Wein AJ, et al. Campbell-Walsh Urology. 10th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.clinicalkey.com. Accessed July 22, 2014.
- AskMayoExpert. What evaluation and treatment are indicated for orchitis as a cause of pediatric testicular or scrotal pain? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
- Eyre RC, et al. Evaluation of the acute scrotum in adults. http://www.uptodate.com/home. Accessed July 18, 2014.
- Schaeffer AJ. Complications of urinary bladder catheters and preventive strategies. http://www.uptodate.com/home. Accessed July 18, 2014.
- Castle EP (expert opinion). Mayo Clinic, Phoenix, Ariz. Aug. 13, 2014.
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