Why does Aarskog syndrome happen?
Last updated September 7, 2026.
**Aarskog syndrome can happen because of changes in the FGD1 gene, although the cause remains unknown in many people.** This gene helps control signals involved in the development of bones and other tissues. When FGD1 is involved, the condition follows an X-linked inheritance pattern and affects males more often than females. Your family history and genetic test results help a clinician explain how the condition could pass through your family. Keeping family health records and discussing testing with a genetic counselor can help you understand your options.
What to do
- **Gather family history:** Write down known genetic diagnoses and growth or developmental differences in your relatives.
- **Ask about evaluation:** Talk with your child's clinician if you notice delayed growth or developmental concerns.
- **Discuss genetic testing:** Ask your clinician what FGD1 testing can explain and what a negative result means.
- **Review inheritance:** Meet with a genetic counselor to understand what your family's findings mean for future pregnancies.
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