Are there known physical or medical problems associated with Fragile X syndrome (FXS)?

Fragile X syndrome (FXS) is a medical disorder caused by a mutation in the FMR1-gene. It's systemic effects are most noticeable in the cognitive behavioral domain, but multiple associated physical problems mostly related to loose connective tissue can occur. These include hypotonia, hyper flexibility, flat feet, recurrent ear infections and mitral valve prolapse. Seizures, precocious puberty and ophthalmic issues can be present. 

Life Expectancy

The life span for people with FXS is not affected because there are usually no life-threatening health concerns associated with the condition.

Learn more:

• https://fragilex.org/wp-content/uploads/2012/08/Physical-Problems-in-FXS2012-Oct.pdf
• https://fragilex.org/understanding-fragile-x/fragile-x-101/