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A varicocele is an enlargement in a vein or multiple veins in the scrotum. It is similar to a varicose vein that occurs in the leg.
A varicocele can be a cause of low sperm production or quality and is a common cause of infertility. A varicocele occurs when there is a blockage or reduction in venous blood flow, which causes a buildup of pressure leading to a varicocele. Varicoceles can be treated by both surgical and non-surgical treatments.