Triple X syndrome is a chromosomal condition caused by the presence of an additional X chromosome in females. The symptoms vary, although many girls and women do not show any symptoms or experience mild symptoms.

Typically, both males and females have 46 chromosomes. In females, this includes two X chromosomes, while males have one X and one Y chromosome.

How common is triple X syndrome?

It is estimated that triple X syndrome occurs in approximately one in 1,000 live female births.

Triple X syndrome is also called:

• Trisomy X
• Triplo-X
• 47 XXX
• XXX syndrome