XXY (Klinefelter syndrome)
Most boys and men with Klinefelter syndrome will not be significantly affected and can live normal, healthy lives.
Infertility tends to be the main problem, although there are treatments that can help (see Treatments below).
However, men with Klinefelter syndrome are at a slightly increased risk of developing other health problems, including:
These problems can usually be treated if they do occur and testosterone replacement therapy may help reduce the risk of some of them.
Read about Klinefelter syndrome - a condition in which male babies are born with an extra X chromosome. Find out about the symptoms, causes and treatments.
Klinefelter syndrome doesn't usually cause any obvious symptoms early in childhood, and even the later symptoms may be difficult to spot. Many boys and men don't realise they have it. Possible featu
Most boys and men with Klinefelter syndrome will not be significantly affected and can live normal, healthy lives. Infertility tends to be the main problem, although there are treatments that can hel
Klinefelter syndrome is caused by an additional X chromosome. This chromosome carries extra copies of genes, which interfere with the development of the testicles and mean they produce less testoster
See your GP if you have concerns about your son's development or you notice any troubling symptoms of Klinefelter syndrome in yourself or your son. Klinefelter syndrome isn't necessarily anything ser
There's no cure for Klinefelter syndrome, but some of the problems associated with the condition can be treated if necessary. Possible treatments include: testosterone replacement therapy(see below
If you or your son has been diagnosed with Klinefelter syndrome, you might find it useful to find out more about it and get in touch with others affected by it. The following websites may be able to