Hydrocoele occurs as a result of excess fluid accumulation in the layers surrounding the testis. The fluid may occur because of excess production or because of less drainage. Various theories have implicated infections, lymphatic blockage and even testicular pathology as the cause of hydrocoele. The fluid in hydrocoele is clear, amber coloured and sterile. Although many people attribute the occurrence of hydrocoele to previous trauma, there is no convincing evidence that fluid accumulation occurs after that. It is often found in areas which are endemic for filariasis and it is plausible that the micro filaria lead to blockage of the scrotal lymphatics leading to fluid accumulation. Sometimes, hydrocoele fluid can accumulate because of testicular tumors which is known as secondary hydrocoele.