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Klinefelter syndrome (KS) is caused by a difference in the sex chromosomes (XXY). It affects males, occurring in 1 in 650 males. KS can cause a variety of problems including breast development, infertility, and hormonal changes. Some males with KS have learning and language problems.
Learn more about the physical characteristics and/or symptoms of Klinefelter Syndrome.
This information was last updated in December, 2015.