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2. Causes

The exact cause of varicoceles isn't known. However, experts believe the condition develops when blood is unable to flow properly through the valves inside the vessels of the spermatic cord that supplies the testicles with blood. When blood cannot flow to the testicles properly, this can cause a backup and force the blood vessels to widen, forming a varicocele. Men of any age can get the condition, but it is most likely to develop during puberty.

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