If the doctor identifies the presence of a Varicocele (it is like a varicose vein on the testicles). The man might be considered fortunate in some ways since it is possible that the condition, and hence the mans fertility, may be corrected.

The presence of a Varicocele is probably the most commonly identified, correctable abnormality, that is associated with male infertility.

A Varicocele is an abnormal dilatation of the testicular veins and around 15% of healthy fertile men in the general population have a detectable Varicocele.

In the infertile population, up to 40% of men have been found to have a Varicocele, so there seems to be an association with infertility. Evidence suggests that varicoceles cause progressive damage so whilst a young man with Varicocele may be fertile it is possible that his fertility will decline with time.
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Varicocele