The risk factors for developing testicular hydroceles include being born prematurely, scrotal injury and infection, according to Mayo Clinic. Between 1 and 2 percent of babies are born with hydroceles, and most adult men who develop the condition are over age 40.
It is possible for hydroceles to develop before birth, Mayo Clinic reports. Normally, testicles drop from the baby's abdomen into the scrotum. Each testicle drops with a sac that allows the testicles to be immersed in fluid. Eventually the sac closes and fluid is absorbed, but sometimes the sac does not close completely, Sometimes, this fluid flows back into the abdomen or the sac changes sizes.
In adults, hydroceles form after an injury to the testicles or inflammation from infection, including sexually transmitted infections, Mayo Clinic reports. Infections may occur in the small tube at the back of the testicle.
Except for an enlarged scrotum, most hydroceles create few symptoms, according to WebMD. Sometimes, patients will experience pressure at the base of the penis, pain and redness.
Most of the time hydroceles requires no treatment, WebMD states. The fluid build-up around the testicles will eventually be reabsorbed in most men under age 65. The condition may require surgery if hydroceles continue to form.