Varicoceles are believed to be caused by defective valves in the veins within the scrotum, just above the testicles. Normally, these valves regulate the flow of blood to and from the testicles. When normal flow doesn't occur, the blood backs up, causing the veins to dilate.
No treatment is required unless there is some symptoms continuing for more than 2 years, like
pain and discomfort | low sperm count | unexplained Infertility
In such cases, surgery may be recommended.