REFERENCE · BIOPSYCHOSOCIAL EXPERIENCE
Unpredictability, Overload, and Trusting Your Body
This page covers: Fear of what your body may do next, difficulty making plans, sensory and social overload, uncertainty about warning signs, and rebuilding enough trust to participate in life without pretending risk is zero.
Scope boundary: Unpredictability and overload can occur in many neurological, medical, psychiatric and neurodevelopmental conditions. They are not diagnostic signs of FND. Sensory overload in particular may have several causes, including migraine, autism, PTSD, fatigue, pain, sleep problems or environmental demands. [1][2][3]
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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For the Person With FND
“I do not know what my body will do”
FND can make ordinary planning feel complicated.
You may wonder:
Will I be able to walk when I get there?
Will I have a seizure?
Will I lose speech?
Will the lights or noise become too much?
Will I need help getting home?
Will I recover in ten minutes or lose the rest of the day?
Unpredictability: Not being able to reliably know when a symptom will appear, how strong it will be, how long it will last or how much it will affect what you can do.
A symptom does not have to be completely random to feel unpredictable.
You may know some patterns and still not be able to forecast every episode.
Fear can be reasonable
Anticipatory fear: Fear or worry about something that may happen in the future.
If you have fallen in a shower, had a seizure in public, lost speech in a crowded room or become unable to walk far from home, some caution afterward is understandable.
Not every safety decision is unhealthy avoidance.
Choosing a shower chair after falls, taking a wheelchair for a long outing, travelling with medication or an emergency plan, or declining an unsafe activity may be sensible.
The difficult question is often:
“What keeps me safe?”
versus:
“What has my fear stopped me from doing even when there may be a workable way to do it?”
That answer is individual.
Overload is often about the total, not one thing
You may tolerate noise when you are rested.
You may tolerate conversation when you are sitting somewhere quiet.
You may tolerate a difficult decision when you are not in pain.
Then all three arrive together and suddenly you cannot think, speak, stay regulated or continue.
Overload: A point where the combined demands on you are greater than what you can manage at that time.
Overload may include physical effort, pain, light, sound, movement around you, thinking, conversation, emotion, social pressure or the effort of monitoring symptoms.
This does not prove a particular FND mechanism.
It describes the situation you are trying to manage.
Sensory load and social load can stack
Sensory load: The amount of input your brain is dealing with from things such as light, sound, touch, movement, visual clutter, temperature or other sensations.
A restaurant may involve music, many voices, bright lights, smells, people moving past, choosing food, following conversation and managing symptoms at the same time.
A medical appointment may involve travel, waiting rooms, fluorescent lighting, several questions, memory demands and anxiety about being understood.
The problem may not be any one input.
It may be the stack.
Reducing one demand can sometimes make the rest manageable.
You do not need to predict everything to make a plan
A plan can be useful even when symptoms remain unpredictable.
You might know:
where you can sit;
who can drive;
what aid you will bring;
how to leave early;
what a supporter should do during a familiar episode;
what symptoms mean you need medical reassessment;
and what activity is optional rather than essential.
Safety plan: An agreed plan for what to do during familiar symptoms, what support is useful, and what changes should prompt urgent or medical review.
A safety plan should make life easier to navigate.
If it becomes a long list that makes you afraid to leave home, simplify it with the appropriate clinician.
Trust does not mean believing your body will never fail you
“Trust your body” can sound impossible when your body has repeatedly surprised you.
You do not need to promise yourself:
“I will definitely be okay.”
A more realistic form of trust can be:
“I know what I will do if symptoms happen.”
“I can leave if I need to.”
“I have an aid.”
“My supporter knows the plan.”
“I can try this for twenty minutes rather than committing to four hours.”
“I can change my mind.”
Trust may grow from having choices, not from having certainty.
Build plans with exits, not traps
Some people avoid plans because saying yes feels permanent.
Try making the commitment smaller.
Instead of:
“I will attend the whole wedding.”
try:
“I will go for the first hour, bring my chair, and leave whenever I need to.”
Instead of:
“I am going shopping.”
try:
“I will go into one store and see how I am doing.”
A planned exit can make participation possible.
It is not failure to use it.
Overload can look like many things
You may notice:
slower thinking;
difficulty finding words;
irritability;
tears;
dissociation;
more movement symptoms;
increased pain;
a need to lie down;
or a strong urge to escape the environment.
Those reactions do not all mean the same thing medically.
The useful first question may simply be:
“What demands can be reduced?”
If the symptom is new, severe or different from your familiar pattern, reassessment may still be needed.
Public symptoms can change how much risk feels acceptable
Part of the fear may be the symptom.
Part may be other people’s reactions.
A seizure in private and a seizure in a supermarket may feel very different even if the neurological event is similar.
You may fear staring, questions, unwanted touching, emergency escalation, being filmed or needing a stranger’s help.
That social risk is real enough to plan for.
It does not mean you have to stop going out.
A short medical card, supporter plan, accessible transport, mobility aid, quieter time of day or known exit route may help.
Do not turn preparation into constant surveillance
Planning can become another form of load.
If you spend every minute checking:
“Is my leg going?”
“Am I dissociating?”
“Is my heart rate wrong?”
“Will this trigger a seizure?”
you may end up with less room for the activity itself.
You do not need to notice every sensation.
Use the smallest amount of monitoring that actually improves safety.
Questions
Which part of unpredictability is hardest: the symptom itself, not knowing when it will happen, or what happens afterward?
Which two demands tend to become too much when they occur together?
What would make one meaningful activity feel safer without requiring a guarantee that symptoms will not happen?
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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For Family, Friends, and Other Supporters
Do not confuse planning with pessimism
Bringing a wheelchair, planning an exit or asking where the quiet room is does not mean the person expects disaster.
It may be what allows them to participate.
Reduce one demand at a time
When the person looks overloaded, you do not have to solve everything.
You might:
turn off the television;
ask one question rather than five;
move to a quieter place;
delay a decision;
sit down;
or help the person leave.
Ask what helps rather than assuming silence, touch, reassurance or coaching is always wanted.
Do not force a choice between total safety and total independence
Statements such as:
“If you are worried about a seizure, you should stay home.”
or:
“If you really want to recover, you need to stop avoiding things.”
can flatten a complicated decision.
Help look for a middle route:
different timing;
shorter duration;
equipment;
transport;
a support person;
or a smaller first step.
Follow the person’s established plan
For familiar events, use the agreed response where one exists.
For new or clearly changed symptoms, seek appropriate medical advice rather than assuming the event is FND.
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
—
For Clinicians and the Care Team
Separate reasonable risk management from fear-maintained restriction
Ask what actually happened, what the objective risks are, what the patient predicts, and what adaptations are available.
Do not label all avoidance as pathological.
A person with falls, impaired awareness, severe fatigue, swallowing risk or other hazards may need genuine restrictions or equipment.
At the same time, where fear is limiting life beyond the identified risk, collaborative graded participation may be useful if it fits the person’s goals and clinical situation.
Assess overload without forcing one explanation
Clarify the components:
sensory input;
cognitive load;
pain;
fatigue;
social demand;
migraine;
autonomic symptoms;
trauma-related responses;
neurodevelopmental factors;
medication effects;
or other medical contributors.
“Overload” is a useful description of experience, not a diagnosis.
Build practical confidence
Occupational therapy and rehabilitation may help identify environmental changes, equipment, task modification, rest, communication supports and graded participation.
Psychological treatment may help when fear, panic, trauma symptoms or avoidance are treatment targets the person wants addressed.
Neither approach proves the cause of FND.
Keep reassessment thresholds clear
A safety plan should distinguish familiar symptoms from changes that need review.
Avoid both repeated unnecessary emergency escalation and automatic dismissal of new symptoms.
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
—
Research and Sources
Qualitative studies describe uncertainty, altered agency, isolation, day-to-day burden and the effort of continuing meaningful life with FND. They support treating unpredictability as an important lived issue, but they do not establish one fear or avoidance pattern for all people. [1][2][3]
Occupational-therapy consensus supports individualized environmental adaptation, activity planning and participation. It does not validate one universal “overload” mechanism or one exposure programme. [4]
The evidence for severe multisensory overload as a distinct FND-specific phenomenon remains limited. Other diagnoses and contributors should be considered where relevant.
| Citation | Full citation |
|---|---|
| [1] | Szasz A, Korner A, McLean L. Qualitative systematic review on the lived experience of functional neurological disorder (FND): an epistemological and ontological analysis. BMJ Neurology Open. 2025;7(1):e000694. FND-CIT-0080. https://doi.org/10.1136/bmjno-2024-000694 |
| [2] | Gatherer C, Garip G. “Look for Glimmers Instead of Triggers”: a qualitative exploration of the lived experiences of people with functional neurological disorder (FND). Psychological Reports. Published online June 15, 2025. FND-CIT-0086. https://doi.org/10.1177/00332941251351234 |
| [3] | Pritomanova I, et al. The journey to diagnosis and care of functional neurological disorder. PLOS ONE. 2026;21(4):e0328321. FND-CIT-0088. https://doi.org/10.1371/journal.pone.0328321 |
| [4] | Nicholson C, Edwards MJ, Carson AJ, et al. Occupational therapy consensus recommendations for functional neurological disorder. Journal of Neurology, Neurosurgery & Psychiatry. 2020;91(10):1037–1045. FND-CIT-0011. https://doi.org/10.1136/jnnp-2019-322281 |
Page created: October 2, 2026 · Clinical, lived-experience and accessibility review pending