Skip Ribbon Commands
Skip to main content
  Print Page

What causes Klinefelter syndrome (KS)?

Skip sharing on social media links
Share this:

The extra chromosome results from a random error that occurs when a sperm or egg is formed; this error causes an extra X cell to be included each time the cell divides to form new cells. In very rare cases, more than one extra X or an extra Y is included.

Last Updated Date: 11/30/2012
Last Reviewed Date: 10/25/2013