A varicocele is a dilated (enlarged) group of veins in the scrotum. Just like some people have dilated or "varicose" veins in their legs, some men have dilated veins in their scrotum. The dilated veins are filled with excess blood.
In people who have large varicose veins in their legs, the valves are not functioning properly and the blood is actually pooling in their legs. Because of this they will find that after standing for long periods of time, the blood has collected in their legs, giving them a heavy dragging feeling. Men with varicoceles may notice a heavy, dragging, aching feeling in the scrotum ("ball sack") at the end of the day. There too the valves in the veins that drain the blood from the testicles (the internal spermatic veins) are not functioning properly and allow the blood to collect.
Varicocele are the only treatable condtion for male infertility, although with time sometimes infertility can improve.
Source: Mayoclinic.com
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My husband has this, but 2 surgeries haven't improved anything, fertility-wise. :(
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