XXY (Klinefelter syndrome)
More informationand support
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 help:
Klinefelter's Syndrome Association UK
Klinefelter Organisation
Contacta Family
Medically Reviewed by a doctor on 21 Dec 2018
Introduction
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.
Symptoms of Klinefelter syndrome
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
Health issues in 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 hel
Causes of Klinefelter syndrome
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
Testing for Klinefelter syndrome
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
Treatments for Klinefelter syndrome
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
More informationand support
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
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