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Varicoceles are enlargements of veins inside the scrotum that drain the testicles.
These enlargements may lead to a rise in temperature and a decrease in blood circulation through the testes, and can hurt sperm production. Varicoceles are enlargements of veins inside the scrotum that drain the testicles. These enlargements may lead to a rise in temperature and a decrease in blood circulation through the testes, and can hurt sperm production. A left varicocele is more common than a right one, but the condition may occur on either side. There are many theories as to why varicoceles might decrease sperm count.