Varicocele risk factors

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Varicoceles usually develop slowly. They are more common in men ages 15 – 25 and are most often seen on the left side of the scrotum. Varicoceles are often the cause of infertility in men.

The sudden appearance of a varicocele in an older man may be caused by a kidney tumor, which can block blood flow to a vein. This is more common on the left side than the right.

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