A sex chromosome disorder caused by the presence of an extra X chromosome in the male karyotype. Affected individuals are infertile and have a small penis and testes. They tend to have tall stature an...
Comprehensive, easy-to-understand information about this condition
How we create this content →Connect with organizations supporting the Klinefelter syndrome community
Helpful links for rare disease information and support
Questions that may be helpful when speaking with your healthcare team
Connect with organizations supporting the Klinefelter syndrome community
Helpful links for rare disease information and support
Questions that may be helpful when speaking with your healthcare team
Connect with organizations supporting the Klinefelter syndrome community
Helpful links for rare disease information and support
Questions that may be helpful when speaking with your healthcare team
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Research studies investigating treatments and therapies for this condition.
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Data from ClinicalTrials.gov Feb 1, 2026
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