It is caused during birth. At eight months of fetal development, a male child’s testicles move from abdomen into the scrotum. The scrotum is the sac of skin that helps in holding it when it moves.
This sac makes the fluids to surround the testicles. During development, this sac closes itself before birth and the fluid inside is absorbed. However, this is not the case with the child having hydrocele.
It may also be caused by:
It may occur in men over the age of 40 due to non-closure or reopening of the channel. This results in the movement of fluids from the abdomen into the scrotum.