Fragile X Syndrome (FXS)

Fragile X syndrome (FXS) is one of the most common causes of inherited intellectual disability. CDC is working to learn more about fragile X syndrome and fragile X-associated disorders to improve the health and well-being of people with these conditions.

Mythbusters
Think you know fragile X? Guess again.

Think you know fragile X? Guess again.

Video: Cause of Fragile X
Video on the causes of Fragile X syndrome

Watch this video to learn about the causes of Fragile X Syndrome.

Our Work
Boy siwning on a swing in the basement

Researchers at CDC are working to better understand how this complex condition affects individuals and their families.