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Fragile X syndrome (FXS) is the most common known cause 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.

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How can my child have fragile X syndrome? It’s not in our family. Learn how FXS can happen.

Uncover the facts

MYTH BUSTERS

Think you know fragile X? Guess again.

Ruth with her family

MY STORY

Real stories from people living with fragile X syndrome.

Boy siwning on a swing in the basement

OUR WORK

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

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