Definition
Klinefelter syndrome is a genetic condition in males caused by having an extra X chromosome (XXY instead of XY). This can lead to hormonal imbalances, impacting physical and cognitive development. It often results in reduced fertility and sometimes learning difficulties. Affected individuals may be taller than average and have less muscle mass. The severity of symptoms varies widely. It's usually diagnosed during puberty or adulthood. Managing Klinefelter syndrome often involves hormone therapy and supportive care.