Understanding Fragile X Syndrome

Fragile X Syndrome is the most common known cause of inherited intellectual disability and the most common known single gene cause of autism spectrum disorder.

Facts about Fragile X Syndrome

  • Fragile X Syndrome is an inherited, life-long condition
  • People with Fragile x Syndrome have intellectual disability, behavioural and learning challenges, as well as certain physical characteristics
  • Depending on how an individual’s FMR1 gene has been changed by Fragile X Syndrome depends whether they show symptoms of Fragile X or are carriers with no symptoms
  • Fragile X Syndrome occurs in both males and females but females generally have milder symptoms than males
  • Fragile X Syndrome is the leading known genetic cause of autism

What impacts can Fragile X Syndrome have?

People living with Fragile X Syndrome experience the effects throughout their lifetime. These effects will vary from person to person and may include:

  • Intellectual and learning disability
  • Speech delay or minimal speech
  • Fine and gross motor delay, coordination difficulties
  • Low muscle tone
  • Anxiety, hyperarousal, ADHD, depression
  • Autistic-like behaviours
  • Aversion to touch, loud noises, bright lights & strong smells
  • Avoidance of eye contact
  • Mood instability

This information has been provided to us by the Fragile X Association.


For over 70 years, CPL has been supporting people to chase the best in life. We understand disability and can support you, or something your care for, at whatever stage of your journey.

Contact us

For more information about Fragile X Syndrome and how we can support you, please call us on 1800 275 753 or send an online enquiry