Klinefelter syndrome is a genetic disorder that affects males.
Klinefelter syndrome occurs when a boy is born with one or more extra X
chromosomes. Most males have one Y and one X chromosome. Having extra X
chromosomes can cause a male to have some physical traits that are unusual for
Many men with Klinefelter syndrome do not have obvious symptoms.
Others have sparse body hair, enlarged breasts, and wide hips. In almost all
men, the testicles remain small. In some men, the penis does not reach adult
Primary Medical Reviewer
John Pope, MD - Pediatrics
Specialist Medical Reviewer
Stephen LaFranchi, MD - Pediatrics, Pediatric Endocrinology
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