This is just a quick post as I thought I should explain what FND is as I have mentioned it a few times and not many people are aware of what it is unless you know someone who has it or they have it themselves. Functional Neurological Disorder is when someone experiences neurological symptoms such as weakness, movement disorders, sensory symptoms and blackout, all though it affects everyone in different ways. The brain of a patient with FND is structurally normal but functions correctly.