Some researchers suspect that advanced parental age may be a risk factor.Compared with males in the general population, Klinefelter syndrome is associated with an increased risk of certain diseases and conditions, including: It is currently thought that testosterone treatment from puberty, which helps with bone and muscle development among other things, may reduce the risk of many of the above conditions.A boy with Klinefelter syndrome has an additional X chromosome.This is thought to be caused by an error within the fertilised egg or the dividing cells as the baby develops. Unlike most of the genetic disorders, Klinefelter disease is not hereditary (meaning it is not passed down through families).
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However, certain physical characteristics sometimes associated with Klinefelter syndrome may be apparent, including: The appearance of signs of Klinefelter syndrome in childhood can vary greatly and range from mild to those that are more obvious.
Many of the signs of Klinefelter syndrome also occur in children with other conditions, or children who do not have an underlying diagnosis, which makes detecting Klinefelter syndrome in childhood difficult.
Klinefelter syndrome is a chromosome disorder that affects males.
Usually, a male has two chromosomes that determine his sex: an X inherited from his mother and a Y inherited from his father.