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.

Learning What Families Need
Family sitting on a red bench

Learn what CDC and partners are doing to learn more about FXS, one case at a time.

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.