It occurs when fluid builds up in the layer of tissue that covers the testicle. It may be caused by an infection or by injury to the testicle. But the cause is often not known. A large hydrocoele can cause pain or swelling in the scrotum and may need surgery to repair the hydrocoele.
If the hydrocele gets large enough, it may need repair. Symptoms that suggest you may need to consider surgery include:
swelling on one side of the scrotum
pain in one or both testicles
uncomfortable heaviness from enlargement of the scrotum
Hydrocoele repair surgery is typically performed under general or regional anesthesia as a day-case procedure.