A varicocele is an enlargement of the veins in the scrotum, much like varicose veins, which are twisted, swollen veins usually found in the leg. They can grow larger and may become more pronounced over time.
Varicoceles largely present no symptoms, and there's a strong chance you won't know you're afflicted unless a doctor notices the enlargement during a physical exam. The worst effects you may experience as a result of a varicocele are shrinkage of the affected testicle and, most notably, possible infertility. Data indicate 4 in 10 men tested for fertility problems were found to have a