NIH Websites Are Changing

Beginning in late July, NIH will start introducing a new website experience designed to make it easier to find health information, research, funding opportunities, and other resources. During the transition, you may notice changes to navigation, page layouts, and where some information is located.

About Fragile X Syndrome

Fragile X syndrome is a genetic disorder that affects a person’s development, especially that person’s behavior and ability to learn. In addition, Fragile X can affect:

  • Communication skills
  • Physical appearance
  • Sensitivity to noise, light, or other sensory information

Fragile X syndrome is the most common form of inherited intellectual and developmental disability (IDD).

People with Fragile X syndrome may not have noticeable symptoms, or they can have more serious symptoms that range from learning disabilities to cognitive and behavior problems.