A varicocele is a condition in which the veins in the loose bag of skin that supports the testicles expand (scrotum). The testicles' oxygen-depleted blood is transported by these veins. When blood collects in the veins instead of flowing freely out of the scrotum, a varicocele develops.
Varicoceles commonly appear throughout adolescence and progress over time. They may cause discomfort but usually have no typical symptoms. A varicocele can result in poor testicle development, inadequate sperm production, or other issues that can lead to infertility. To address these issues, varicocele surgery may be indicated.