FND is not a mental health disorder. It is a neurological condition with genuine neurological symptoms. Therefore, it is classified as a neurological disorder.
FND can be understood through two overlapping theories: as a stress/threat response and as altered predictions in the brain.
1. Stress/threat-response theory
Stress, pain, injury or trauma can alter the nervous system's state, increasing arousal and attention to the body. This may disrupt normally automatic processes such as movement or sensation. Importantly, this does not mean symptoms are consciously produced or that a person must feel stressed when symptoms occur.
2. Predictive-processing theory
The brain constantly predicts what the body should feel and how it should move, then compares these predictions with incoming sensory information. In FND, researchers propose that incorrect or overly strong predictions may sometimes dominate incoming signals, leading to genuine symptoms such as weakness, tremor or altered sensation.
At a cellular/network level, this may involve changes in how groups of neurons learn and weight predictions versus sensory information, involving systems such as GABA, glutamate, dopamine and noradrenaline. However, there is no single identified cellular abnormality that causes FND.
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The problem with disorders like FND (and others such as chronic migraine and endometriosis) is that those affected get such bad care, that they are left with no alternative than to spend their days desperately looking for information on how to improve their terrible symptoms.