Boys with FXS often become more mild-mannered as they approach adulthood. They develop a good sense of humor and become very hard-working and determined to accomplish tasks. Women with a full mutation and symptomatic FXS exhibit anxiety-related symptoms such as obsessive-compulsive disorder, shyness, social avoidance, social anxiety, mood swings, and depression. Men over 50 with FXS sometimes develop tremors, rapid onset of dementia, incontinence, and symptoms associated with movement disorders.

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