Functional neurological disorder is a condition where the brain and nervous system are structurally intact, but the way the nervous system is functioning is disrupted. A simple way to picture it is to imagine the brain is a computer: the hardware is still there and working, but the software (the brain’s movement and sensation control programs) is not running properly.
A helpful way to understand functional neurological disorder is to think about how movement and sensation are normally automatic. You do not consciously tell every muscle what to do when you walk. In functional neurological disorder, automatic movement control can become disrupted, and the brain may start to over-monitor body sensations or movement. Symptoms may include limb weakness, tremor, walking difficulties, dizziness, sensory changes, speech problems, or episodes that look like seizures. These patterns are often shaped by a mix of factors such as a triggering injury or illness, pain, fatigue, heightened threat responses, past experiences, sleep disruption, and ongoing life stress. Sometimes a trigger is obvious, and sometimes it is not. Many people with functional neurological disorder feel confused because tests such as scans or blood work may come back normal, yet their symptoms can be disabling.
Functional neurological disorder is the main umbrella diagnosis, but you may hear a few different names used for the same group of symptoms. Functional movement disorder is used when symptoms are mainly movement-related (such as tremor, gait changes, jerks, or weakness). Conversion disorder is an older term that some people relate to if they can clearly link symptoms to psychological trauma, but many people with functional neurological disorder cannot identify a single trauma, so it is not a good fit for everyone. You may also see it called dissociative neurological symptom disorder, which is the term used in the International Classification of Diseases 11th revision.
Key Facts
- An Australian Institute of Health and Welfare report estimated a minimum prevalence of 79 per 100,000 people, equating to about 21,500 Australians living with functional neurological disorder in 2024. 🔗
- Physiotherapy has a key role in the multidisciplinary management of patients with functional motor disorder. 🔗
- One literature review from 2024 concluded that physical activity and exercise appear to be largely beneficial for treatment and symptom reduction in FND and comorbid disorders 🔗
Risk Factors
- Previous injury, illness, or a stressful health event followed by persistent symptoms
- Chronic pain conditions, migraine, dizziness syndromes, or fatigue conditions
- High symptom monitoring and fear of movement or falls
- Repeated medical testing without a clear explanation, leading to uncertainty and protective behaviours
- Co-existing anxiety, low mood, trauma history, or significant life stress (not required, but can contribute)
- Reduced activity levels over time, leading to deconditioning and reduced movement confidence
Symptoms
- Limb weakness or a heavy, “disconnected” feeling in an arm or leg
- Tremor, jerking, spasms, or unusual postures
- Difficulty walking (dragging a leg, knee buckling, freezing, unsteady gait)
- Balance problems and falls, especially in busy or stressful environments
- Sensory symptoms such as numbness, tingling, altered touch, or pins and needles
- Speech changes (stuttering, whispering voice, slurred speech)
- Dizziness, light-headedness or episodes of altered awareness that may look like seizures (dissociative attacks)
- Fatigue that feels disproportionate to activity
Aggravating Factors
- Heightened attention to the body
- Fatigue, poor sleep, or doing too much on a “good day” then crashing afterwards
- Stressful situations, conflict, sensory overload, or feeling rushed
- Pain flares, particularly if movement becomes guarded or fearful
- Avoidance of activity, leading to deconditioning and increased movement sensitivity
Causes
The exact cause of functional neurological disorder is not well know, however the condition is best understood through a biopsychosocial lens. That means looking at biological factors (nervous system sensitivity, pain, migraine, dizziness, autonomic symptoms), psychological factors (fear of symptoms, threat responses, attention) and social factors (work stress, family roles, health experiences and access to care).
Common pathways include:
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A trigger such as an injury, illness, concussion, surgery, infection, vestibular event, or major life stressor that increases body vigilance and threat responses.
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A learned movement pattern, where the body adapts around pain or fear, and the nervous system remembers that pattern even after tissues have healed.
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Attention and expectation effects, where focusing on a body part or fearing symptoms makes automatic movement less reliable.
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Ongoing drivers such as fatigue, poor sleep, persistent pain, dizziness, anxiety, low mood, or repeated medical uncertainty.
Physiotherapists help identify the specific drivers for your presentation and then build a rehabilitation plan that targets movement retraining and confidence.
How Is It Diagnosed?
Functional neurological disorder is usually diagnosed by a neurologist, using specific tests. The diagnosis is confirmed when positive clinical signs are present, not just because tests for other neurological disorders are normal. For example, a doctor may conduct observation to determine if functional limb weakness varies with distraction, posture, or task and use certain bedside signs (such as Hoover’s sign in leg weakness) to support the diagnosis.
A physiotherapist can also identify functional movement patterns during a detailed movement assessment. This might include observing how symptoms change with attention, rhythm, speed, automatic movements, dual-tasking, or when movement is linked to a meaningful goal. Physiotherapy assessment often looks at the whole picture, including how pain, breathing, balance, confidence, fatigue, and avoiding certain activities might be affecting symptoms day to day.
A good diagnosis should come with a clear explanation you can understand. When the diagnosis is explained well, it supports engagement in functional neurological disorder rehabilitation, including targeted physiotherapy and graded return to activity.
Investigations & Imaging
- MRI (Magnetic Resonance Imaging)
- To exclude structural causes that could explain weakness, sensory change, or gait disturbance such as brain or spinal cord lesion.
- Blood tests (tailored to symptoms)
- To screen for metabolic, inflammatory, endocrine, or nutritional contributors that can mimic neurological symptoms.
- Electroencephalogram (EEG)
- Used when events resemble seizures, to help distinguish dissociative attacks from epileptic seizures.
- Nerve conduction studies and electromyography
- May be used if a peripheral nerve disorder is suspected as a contributor to weakness or sensory symptoms.
- fMRI (Functional Magnetic Resonance Imaging) - only used in research
- Only currently used in research and is not required nor used to diagnose FND. fMRI is used to map function in the brain and has shown changes in how brain networks communicate in FND. These findings have contributed to a greater understanding of the explanation that the condition occurs due to altered signalling in the brain.
Physiotherapy Management
Physiotherapy for functional neurological disorder is one of the most important treatments, particularly when symptoms involve movement, balance, gait, weakness, dizziness, or fatigue. A physiotherapist helps you retrain normal, efficient movement and rebuild confidence in your body. Functional neurological disorder physiotherapy exercises focus on restoring automatic movement and gradually returning you to meaningful activities. Many people improve with the right diagnosis, the right education and targeted rehabilitation.
Exercise
Functional neurological disorder physiotherapy exercises are built around retraining automatic movement. Your physiotherapist will choose movements that help the brain reconnect with normal patterns, often by shifting attention away from the symptom and towards an external goal. For example, instead of repeatedly testing a “weak” leg, a program might use step targets, rhythmic walking, ball tasks, or timed functional activities to rebuild automatic control. Exercise is usually graded. This means starting with what is achievable today (even if that feels small) and building volume and complexity over time. If fatigue is a major issue, exercise will be paced carefully to avoid boom-bust cycles.
Activity Modification
Activity modification in functional neurological disorder rehab is about reducing the factors that trigger symptoms without avoiding life. This might include breaking tasks into smaller chunks, planning rest in advance, reducing symptom checking, and using graded exposure to feared activities (such as stairs, shopping centres, or driving) with a physiotherapist guiding the progression. The aim is to rebuild trust in the body and normalise movement in real-world environments, not just in the clinic.
Postural Retraining
Posture is not the cause of functional neurological disorder, but postural strategies can worsen symptoms when they become rigid and protective. A physiotherapist may work on relaxed, adaptable postures for standing and walking, especially if you are bracing, holding your breath, or stiffening through the trunk. For functional gait disorder, subtle changes such as widening stance, improving weight shift, or restoring natural arm swing can reduce the “threat” signal to the nervous system and make walking feel more automatic.
Education
Education is a major part of physiotherapy for functional neurological disorder. This includes explaining the diagnosis in a practical way, linking symptoms to nervous system function (not damage), and identifying your individual drivers such as pain, fatigue, attention, fear, and avoidance. Education also includes coaching on what to do during flare-ups: how to reduce threat (breathing, grounding), how to redirect attention, and how to keep moving safely without reinforcing abnormal patterns. Physiotherapists often help patients and families understand that improvement is possible and that rehab focuses on retraining the system.
Other Treatments
Functional neurological disorder is often managed best with a multidisciplinary approach. Depending on your symptoms, this may include neurology, neuropsychology or psychology (to work on symptom management skills, threat responses, and coping), occupational therapy (daily function and routines), speech pathology (speech or swallowing symptoms), and medical input for pain, migraine, sleep, dizziness, or mood.
Psychological therapy can be helpful even when you do not identify a psychological “cause”, because it can reduce nervous system threat responses and improve symptom management skills. Medication does not “treat” functional neurological disorder directly, but may help with co-existing conditions that commonly drive symptoms, such as migraine, anxiety, depression, sleep problems, or chronic pain. Physiotherapists frequently coordinate with other providers so everyone is using the same explanation and recovery approach.
Surgery
Surgery is not a treatment for functional neurological disorder itself because there is no structural damage that surgery can correct. Scans and other investigations often confirm that there isn’t damage to the nervous system that would be improved by surgery. Instead, the main issue is how the nervous system is functioning, so treatment focuses on rehabilitation, especially physiotherapy for functional neurological disorder, to retrain movement and rebuild confidence. Sometimes people with functional neurological disorder also have a separate structural condition at the same time, such as a meniscus tear, a nerve compression or arthritis. In those situations, surgery may be appropriate for the structural problem if it clearly matches the symptoms and if conservative care has been fully trialled. However, it is important that any decision for surgery is made carefully with your treating team, because operations and procedures can sometimes increase disability in functional neurological disorder.
Prognosis & Return to Activity
Many people with functional neurological disorder improve and a good proportion make substantial gains in day-to-day function with the right diagnosis, a clear explanation and targeted rehabilitation. Improvements are often most noticeable when treatment is practical and tailored to the person’s specific goals and needs. Even when symptoms have been present for a while, progress is still possible. The focus is usually on helping the nervous system run more reliable “automatic” movement again, rather than forcing symptoms to stop through effort alone.
Recovery is often not a straight line. Symptoms can fluctuate, and flare-ups may occur with illness, fatigue, poor sleep, pain flares, sensory overload, or stressful periods. This does not mean you are back to square one. A key part of functional neurological disorder rehab is developing a clear plan for setbacks, so you can shorten flare-ups and keep steadily building capacity.
Return to activity is typically guided by function, confidence, and consistency rather than waiting for zero symptoms. Your physiotherapist will help you set meaningful milestones such as walking further with a more natural gait, returning to work or study in stages, resuming driving, rebuilding fitness, or gradually returning to sport-specific training. With a graded plan, repeated successful practice, and the right strategies to reduce symptom-checking and fear, many people regain independence and get back to valued activities.
Complications
- Reduced independence due to falls, walking limitation, or unpredictable symptom episodes
- Deconditioning and reduced fitness from activity avoidance or fear of triggering symptoms
- Persistent pain, fatigue and reduced participation in work, study, sport and social life
Preventing Recurrence
- Practise your plan for flare ups: use the same physiotherapy strategies that restore automatic movement (rhythm, external focus, goal-based movement) when symptoms first increase, rather than waiting until you are stuck.
- Keep weekly activity consistent, and progress functional neurological disorder physiotherapy exercises in planned steps to reduce relapse risk.
- Reduce symptom-checking habits: repeated testing of strength, walking, or balance can increase attention and make automatic movement less reliable.
- Maintain sleep, conditioning, and pacing routines: fatigue and poor sleep commonly amplify functional neurological disorder symptoms, so your physiotherapy plan should include realistic sleep and energy strategies.
- Address co-existing drivers early (pain, migraine, dizziness): treating these alongside functional neurological disorder rehab reduces the load on the nervous system and supports sustained improvement.
When to See a Physio
- If you have been diagnosed with functional neurological disorder and you have weakness, tremor, gait changes, balance problems, dizziness, or falls risk
- If you are avoiding activity due to fear of symptoms, or you are stuck in a cycle of fatigue
- If you want a clear, structured functional neurological disorder rehab plan with measurable goals
- If symptoms fluctuate often and you need a flare-up plan to reduce setbacks
- If you have pain, dizziness, or deconditioning alongside functional neurological disorder and you want a coordinated approach to build capacity safely