Hydrocele
RoutineOverview
A hydrocele is a fluid-filled sac that forms around a testicle, causing painless swelling on one or both sides of the scrotum. It happens when fluid collects in the thin sheath surrounding the testicle, and is one of the most common causes of scrotal swelling in both infants and adult men.
Hydroceles are usually harmless on their own, but the same swelling can occasionally be a sign of another condition — a hernia, infection, or, rarely, a testicular tumor — which is why a proper evaluation matters even though most hydroceles turn out to be simple and low-risk.
Symptoms
Causes
In infants, a hydrocele forms when the passage between the abdomen and scrotum — open during fetal development to allow the testicle to descend — doesn’t fully close after birth, allowing fluid to collect. In older boys and adult men, a hydrocele can develop after injury to the scrotum, inflammation or infection of the testicle or epididymis, or sometimes with no identifiable cause.
Risk Factors
Diagnosis
A hydrocele is usually diagnosed on physical exam — shining a light through the scrotum (transillumination) typically shows the swelling is fluid-filled rather than solid tissue. An ultrasound is often used to confirm the diagnosis and rule out a hernia, testicular tumor, or other cause of scrotal swelling, particularly in adults presenting for the first time.
Complications If Untreated
A simple hydrocele is not dangerous and doesn’t affect fertility or testicular function. Left alone, a large hydrocele can cause ongoing discomfort or a heavy, dragging sensation, and — because a hydrocele can occasionally coexist with or mask a hernia or other testicular condition — persistent or growing swelling is worth having properly evaluated rather than assumed to be routine.
Treatment Options
Prevention Tips
There’s no reliable way to prevent a congenital hydrocele in infants. In older boys and men, protecting the scrotum from injury and getting any genital infection or swelling checked and treated promptly are the main practical precautions.
Lifestyle Advice
For infants with a hydrocele under observation, no special care is usually needed beyond routine follow-up to confirm it’s resolving. In adults, snug supportive underwear can ease discomfort from a larger hydrocele while awaiting evaluation or treatment.
Frequently Asked Questions
No, though they can be hard to tell apart without an exam. A hydrocele is fluid around the testicle; a hernia is tissue (often part of the intestine) pushing through the abdominal wall into the groin or scrotum. An ultrasound distinguishes between the two reliably.
In infants, most hydroceles present at birth resolve on their own within the first 12 to 24 months as the passage between the abdomen and scrotum closes naturally. Hydroceles that develop later, including in adults, don’t typically resolve without treatment if they persist or grow.
A simple hydrocele does not affect fertility. It sits around the testicle rather than affecting the testicle itself or sperm production.
Hydrocelectomy is generally a well-tolerated day-care or short-stay procedure performed under anesthesia, with manageable discomfort for a few days afterward — most patients return to normal activity within a week to ten days.
Sudden, painful scrotal swelling — unlike the typically painless swelling of a hydrocele — needs urgent evaluation, since it can signal testicular torsion, a time-sensitive emergency. A hydrocele itself is rarely an emergency, but any sudden painful change should be checked promptly rather than assumed to be a hydrocele.