Functional neurological disorder, or FND, sits at an uncomfortable intersection of neurology, rehabilitation and psychology. People may experience weakness, tremor, seizures, gait changes, speech difficulty, sensory symptoms or cognitive problems, sometimes after many appointments and contradictory explanations. Too often they are left with the message that tests are normal and therefore nothing is wrong.
Something is wrong. FND involves a change in how nervous-system networks are functioning rather than damage that appears on a conventional scan. The symptoms are not consciously produced, and the absence of structural damage does not make them voluntary. A useful comparison is software rather than hardware, although even that metaphor is incomplete because brains and bodies are more dynamic than computers.
A positive diagnosis, not a diagnosis of exclusion
The 2025 Australian treatment recommendations state that FND should be diagnosed using positive clinical signs. These are features, such as particular patterns of inconsistency or incongruence, that a trained clinician can identify and explain. The diagnosis is not meant to mean “every other test was negative, so this must be psychological”.
This distinction changes the conversation. A patient deserves to know the name of the condition, the signs on which the diagnosis was based, how those signs fit their symptoms and what happens next. A vague suggestion to see a psychologist, without a coherent neurological explanation, can feel like abandonment and often delays treatment.
Appropriate investigation still matters because FND can coexist with neurological disease and other medical conditions. Positive signs should increase diagnostic clarity, not become a reason to stop listening when the clinical picture changes.
Why attention and prediction matter
Movement and sensation usually occur with little conscious supervision. The brain continuously predicts what the body is about to do and integrates those predictions with incoming information. In FND, attention, expectation and learned patterns can become part of a disrupted process, so that trying harder to control a movement may sometimes make it less automatic and more difficult.
This does not mean the person thought themselves into the condition. It does suggest why rehabilitation often uses redirected attention, automatic movement, rhythm, graded practice and experiences that demonstrate the capacity for more normal function. The person is learning a different pattern, not being asked to confess that the first one was imagined.
Stress may be relevant for some people, as it is for migraine, epilepsy, pain and many other neurological conditions. It is neither necessary nor sufficient for an FND diagnosis. Searching for a hidden trauma to “explain” every case is not evidence-based and can be damaging.
Treatment is usually multidisciplinary
The Australian recommendations emphasise coordinated care involving the professions relevant to the person's presentation. That may include neurology, general practice, physiotherapy, occupational therapy, speech pathology, psychology and psychiatry. No single discipline owns FND.
The large Physio4FMD randomised trial offers a useful example of why evidence needs careful reading. Specialist physiotherapy did not significantly outperform community neurological physiotherapy on the primary physical-function outcome at twelve months, although several secondary outcomes favoured the specialist program and participants reported better perceptions of improvement. That is neither a failed treatment nor a decisive victory.
A 2024 scoping review similarly found a growing range of promising interventions alongside substantial variation in study quality, symptoms and outcome measures. Treatment should be hopeful, but not over-sold.
What psychology is doing here
Psychological therapy may help with symptom-related fear, attention, avoidance, boom-and-bust activity, dissociation, panic, sleep, pain, grief, depression or the social impact of being disbelieved. It can also address trauma when trauma is genuinely part of the person's history and current formulation.
The aim is not to persuade somebody that their symptoms are psychological. It is to help the person understand the factors that amplify or maintain their particular pattern, work alongside rehabilitation and rebuild a life that has often become smaller and less predictable.
Recovery varies. Some people experience remission, others make substantial functional gains with remaining symptoms, and some need long-term adaptation. Clear diagnosis, respectful communication and access to coordinated treatment improve the starting conditions, which is why getting the explanation right matters so much.
Research drawn on
- Lehn A, Petrie D, Palmer D, et al. Managing functional neurological disorder: treatment recommendations for health professionals in Australia. BMJ Neurology Open. 2025.
- Nielsen G, Stone J, Lee TC, et al. Specialist physiotherapy for functional motor disorder in England and Scotland (Physio4FMD). The Lancet Neurology. 2024.
- Sireci F, Ragucci F, Menozzi C, et al. Exploring therapeutic interventions for functional neurological disorders: a comprehensive scoping review. Journal of Neurology. 2024.