A teenager who woke up one morning with an unexplained twitch later began speaking in Irish and French accents. Mary Henry, 19, said her world was turned upside down by the sudden condition - which has since been diagnosed as Functional Neurological Disorder (FND) - a problem with the functioning of the nervous system.
It affects how the brain and body send and receive signals and that can lead to a host of physical, sensory and cognitive problems, Chronicle Live reports.
Mary has gone from being a proudly independent 19-year-old to relying on her family and friends as a result of severe symptoms including being unable to walk, talk and chronic fatigue.
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