The EastEnders actor, Danny Dyer, 47, said he would undergo a surgery on his testicles after suffering from a hydrocele He said that his father is the one who convinced him to have an operation, as Dyer noticed his testicle being enlarged. But, what is this condition?What Causes A Hydrocele?It is a sac of fluid around the testicle, which are usually common in babies and are mostly painless. In babies, they disappear without treatment. It can occur at any age.For Infants It is most common in babies as a child's testicles descent from their abdomen into the scrotum towards the end of pregnancy. The scrotum is the sac of skin that holds the testicles once they descend. During this development, each testicle has a naturally occurring sac around it containing fluid, which closes itself and body absorbs the fluid inside during baby's first year. However, this does not happen for babies who are born with a hydrocele, most of them are born prematurely and develop it later. In AdultsIt can also come later in one's life, especially in men over the age of 40. In Dyer's case, it is at 47. This can happen from a hernia. A lot of cases are that of an inflammation or fluid which is not absorbed properly. The epithelial cells in the sac produce and reabsorb fluid constantly, however, there can be a dysfunction, causing the excess fluid. It could also be a result of an injury or an infection.Types of hydrocelesNon-communicating hydroceles - This happens when you body does not absorb the fluid and the remaining fluid is absorbed within a yearCommunicating hydroceles - This happens when the sac surrounding your testicle does not close all the way. This then allows the fluid to flow in or outNuck's hydroceles - This is a rare kind, which is found in people without testicles. This can happen in the lining of pelvic wall and can cause painful swelling in the lymph nodes of the groin. It could be mistaken for ovarian cysts, endometriosis or other conditions which makes the diagnosis difficultAre There Any Symptoms?Talking about symptoms, mostly there is no pain, it is mostly a swollen or an enlarged scrotum. However, depending on the severity of swelling, it may cause discomfort or pain.In some cases, some people feel heaviness in scrotum, while other may feel the heaviness worse in the evening. For non-communicating hydroceles, the size usually stays the same or grows very slowly for anyone to notice it.In communicating hydrocele, the sac does not close itself, which means the fluid can travel in or out of the sac. You could also develop a hernia due to this, which are also known an inguinal hernias. This may require surgery in some cases, especially if the scrotum appears large, swollen and changes size throughout the day.What Are The Similar Conditions?While hydroceles are often harmless and resolve themselves without medical intervention, there are other testicular conditions which may look like hydrocele but require medical intervention:Spermatocele - This is benign condition that causes swelling, however. these are cysts that form within the tubules that lead to the testis Varicocele Swelling - While this is also the condition causing testicular lumps or swelling, in this case, the veins inside the testicles are dilated or enlarged.Epididymal Cyst - This happens when fluid collects in the epididymis, a coiled tube that sits behind the testicles.Epididymitis - This is an inflammation of the epididymitis, and is causes by an STI.Hematocele - While hydroceles are fluid-filled sacs, hematoceles are sacs filled with blood, caused usually by trauma or injury.