The symptoms of FND, functional neurological disorder, are real, physical and often frightening, and the thing people most need to hear first is that they are not imagined. FND is a problem with how the nervous system functions rather than damage to its structure, which is why the symptoms can be genuinely disabling and yet the scans come back normal.
The main symptoms are functional weakness, functional or dissociative seizures, functional tremor and movement problems, functional dizziness, and cognitive symptoms such as trouble with memory and concentration, often alongside fatigue and pain. This guide describes the main types and, more importantly, what they mean for an ordinary day and how support at home helps.
One thing to be clear about up front. This is a description written to help families understand what they are seeing, not a way to diagnose anything. FND is diagnosed by a neurologist, on positive signs rather than by ruling everything else out, and the detail below draws on the patient guide written by Professor Jon Stone at neurosymptoms.org.
The main symptoms
FND does not look the same in any two people, and most people have more than one of these. The recognised symptom types include:
- Functional limb weakness. An arm or a leg that feels weak, heavy or that does not do what it is told. It can come and go, and it is a common reason people first present to hospital.
- Functional or dissociative seizures. Episodes that can look like an epileptic seizure or a faint, with shaking, stiffening or a loss of awareness, but which are not caused by the electrical changes of epilepsy. They can be one of the most distressing symptoms for families to witness.
- Functional tremor and movement problems. Shaking, jerks, spasms or difficulty with walking and coordination. A functional tremor often changes or settles when attention moves elsewhere.
- Functional dizziness. A persistent sense of dizziness or unsteadiness, sometimes called PPPD, that is worse standing or moving in busy places.
- Cognitive symptoms. Trouble with memory, word-finding and concentration, the experience many people describe as brain fog. It is real, and it is exhausting.
Alongside these, most people also live with what the guide calls common associated symptoms, above all fatigue and pain, and often disturbed sleep. These are not a footnote. For many people the fatigue is as disabling as the headline symptom.
What the symptoms have in common
Two features run through nearly all of them, and both matter for day to day life. The first is that the symptoms fluctuate. A good day and a bad day can look like two different conditions, and that unpredictability is one of the hardest things to live with and to plan around. The second is that they are worse when attention is fixed on them and often ease when the person is absorbed in something else, which is a genuine feature of how FND works and not a sign that the symptoms are not real.
Understanding both of these changes how you help. It is why a rigid routine tends to work less well than a flexible one, and why pushing through a bad day rarely pays off.
What this means day to day, and how support at home helps
The practical shape of FND is the fluctuation. Some days are close to normal, others need everything scaled back, and no one can always tell in advance which is coming. Good support is built around that rather than against it: help that flexes with the day, that is there on the bad ones without taking over on the good ones, and that protects energy for the things that matter most.
In practice that means a hand with the tasks that a bad day makes unsafe or exhausting, steady company that reduces the isolation the condition can bring, and help getting to the appointments that keep treatment moving. Our guide to supporting someone with FND at home goes into what actually helps, and what does not.
If you are in Hertfordshire, it also helps to know where your care comes from, because FND treatment runs through neurology, physiotherapy and psychology working together. East and north Hertfordshire are covered by the neuro rehabilitation team at Danesbury in Welwyn, and west Hertfordshire by the community neuro service reached from Harpenden Memorial Hospital. Our guide to FND support in Hertfordshire sets out which service covers your town, from Harpenden and Welwyn Hatfield to Brookmans Park and the Welwyn villages.
If the symptoms are new, the first step is a neurologist's assessment, and it is worth reading why a normal scan does not rule FND out, because that surprises almost everyone.
Frequently asked questions
Are FND symptoms real or imagined?
They are real. FND is a problem with how the nervous system functions rather than damage to its structure, so the symptoms are genuine and often disabling even though scans can look normal. They are not put on and they are not imagined.
What are the most common symptoms of FND?
Functional limb weakness, functional or dissociative seizures, functional tremor and movement problems, functional dizziness, and cognitive symptoms such as memory and concentration difficulties. Fatigue and pain are very common alongside them.
Why do the symptoms come and go?
Fluctuation is a genuine feature of FND. Symptoms are often worse when attention is fixed on them and ease when the person is absorbed in something else, which is part of how the condition works, not a sign that it is not real.
Who diagnoses FND?
A neurologist, on positive signs rather than simply by ruling other conditions out. If the symptoms are new, a neurology assessment is the right first step.
How can care at home help with FND symptoms?
By flexing with the fluctuation: help on the harder days, steady company against the isolation, protecting energy for what matters, and getting to the appointments that keep treatment moving, without taking over on the good days.
Arranging Care Is Simple
Starting care can feel like a big step. We keep it calm and straightforward, and we are here to guide you from your very first call.
1. Talk to us
Get in touch by phone or request a callback. We will listen, answer your questions and help you understand the options, so you can decide in your own time.
2. A home visit and initial consultation
We arrange a visit to understand your routines, your home and what matters most to you. Together we agree an initial consultation and shape the support that feels right.
3. Your care begins
A small, familiar team starts your care, arriving at the agreed times and staying involved as your needs change. We remain your trusted adviser throughout.
Whenever you are ready, we are here to help.