Want to know about Fredreich Atasia, its symptoms and causes and its treatment

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I have a friend whose family was attacked by the above disease. Though his mother is perfectly normal, almost everyone from his father's side has been attacked by the disease excepting one of his aunt. His father was also attacked by it. So my friend is worrying that he might also be attacked by it. Are there any chances that he might not be attacked by it. What is the root cause of the disease and what are it's early symptoms. Is there any treatment for it? If anyone has any knowledge about this please let me know.