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A varicocele is mass of enlarged and dilated veins in the testicle that essentially feels like a bag of worms. It is generally not harmful and usually not painful. Approximately 15 percent of males have this condition which almost always occurs on the left side. A varicocele usually develops at puberty (age 15) but can occur earlier.
There are several theories as to what causes varicoceles, however, none have been conclusively proven.
In older adult males, varicoceles have been associated with decreased fertility, but this occurs in a minority of patients with varicoceles. The relationship between the size of the varicocele and the potential risk for infertility is unclear
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