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.

Fragile X syndrome
Kids sitting on a haystack

Five things you may not know about fragile X syndrome.

How Fragile X Is Inherited
Human chromosomes, illustration

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