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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.

Fragile X Syndrome Topics

information page iconBasics

Facts, causes, signs, diagnosis, and treatments.

graph iconRelated Concerns

Overview of other conditions that often occur with fragile X syndrome.

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View and print free materials.

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Real stories from people living with fragile X syndrome.

information page iconAssociated Disorders

Fragile X-associated disorders.

graph iconData & Statistics

Data and statistics highlights.

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Scientific articles.

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Overview of CDC’s work.

National Fragile X Foundation


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Treatment and research support for fragile X syndrome and other fragile X-associated disorders.


FRAXA Research Foundation


FRAXA Research Foundation logo


Finding a cure for fragile X syndrome.






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  • Centers for Disease Control and Prevention

    National Center on Birth Defects and Developmental Disabilities

    Division of Human Development and Disability

    1600 Clifton Road
    MS E-88
    Atlanta, GA 30333
  • 800-CDC-INFO
    TTY: (888) 232-6348
  • Contact CDC-INFO
  • Page last reviewed: July 14, 2014
  • Page last updated: July 14, 2014 The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC-INFO