Tremors, seizures and paralysis: this brain disorder is more common than multiple sclerosis – but often goes undiagnosed

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Imagine suddenly losing the ability to move a limb, walk or speak. You would probably recognise this as a medical emergency and get to hospital.

Now imagine the doctors at the hospital run some tests and then say, “Good news! All your tests were normal, clear scans, and nothing is wrong. You can go home!” Yet, you are still experiencing very real and disabling symptoms.