Functional Neurological Disorder: Symptoms, Diagnosis and Treatment

Overview

Functional neurological disorder (FND) is a neurological condition caused by changes in how brain networks work, rather than changes in the structure of the brain itself. Brain scans usually look normal in FND, but the way the brain sends and receives signals is disrupted. The symptoms are genuine and can be disabling. FND is not imagined and it is not faking.

FND can affect children and adults and is more common in women. Two of its best-known forms are functional (dissociative) seizures, which usually begin in the late 20s, and functional movement disorder, which usually begins in the late 30s. Symptoms may start suddenly, sometimes after a stressful event or emotional or physical trauma, though a trigger cannot always be identified. Stress, other neurological conditions and mental health conditions are risk factors, but FND is not simply a psychological problem.

Symptoms can increase with attention and ease with distraction, which is a feature of how FND works, not a sign that it is fake. Neurologists diagnose it based on specific positive signs in the exam, not only by ruling everything else out. Recovery varies: for some people symptoms are short-lived, while for others they last for years and can flare up. Understanding the diagnosis and getting the right kind of rehabilitation are central to improving.

Symptoms

Weakness or paralysis of a limb
Tremor, jerks or other abnormal movements
Difficulty walking or unusual gait
Seizure-like episodes with shaking or apparent loss of consciousness (functional or dissociative seizures)
Numbness or loss of sensation
Speech or swallowing difficulties
Vision problems, such as double vision
Dizziness
Memory and concentration difficulties
Pain and fatigue

Diagnosis

Detailed history: how symptoms started, how they behave and what makes them better or worse
Neurological exam with positive signs: for example, Hoover's sign for functional leg weakness, or entrainment testing for tremor, which show a pattern specific to FND
EEG: records brain electrical activity, especially during an episode, to distinguish functional seizures from epilepsy
EMG and nerve studies: help rule out nerve or muscle disease
Brain imaging: MRI or CT to rule out other conditions; results are usually normal in FND

A neurologist makes the diagnosis, sometimes with input from a neuropsychiatrist or mental health professional.

Treatments

Education and explanation: understanding what FND is and that improvement is possible is considered a foundational part of treatment
Specialist physical therapy: FND-informed physiotherapy that helps retrain movement with gradual, increasing exercise
Occupational therapy: support with daily activities, energy management and returning to school or work
Speech and language therapy: for speech or swallowing symptoms
Psychotherapy: cognitive behavioral therapy (CBT) is especially studied for functional seizures; psychodynamic therapy and mindfulness-based approaches are also used
Treating co-occurring conditions: medicines or therapy for depression, anxiety, pain or sleep problems when present; there is no FDA-approved medication for FND itself
Avoiding anti-seizure drugs for functional seizures: these medicines do not help functional seizures
Experimental: transcranial magnetic stimulation (TMS) has been studied, with mixed results so far

Medical Resources

Your Care Plan

A step-by-step guide to navigating your condition, from finding the right doctors to advocating for the care you deserve.

Step 1: Doctors to See

Start with: Your primary care doctor, who can refer you to a neurologist and help rule out other causes.

Then seek: A neurologist familiar with FND, ideally one who explains the positive signs behind the diagnosis rather than telling you your tests are simply normal.

Build your team:

FND-informed physical therapist: for weakness, walking and movement symptoms
Occupational therapist: for daily function and pacing
Psychologist or psychiatrist: for CBT or other therapy, and for anxiety, depression or trauma if present
Speech-language pathologist: for speech or swallowing symptoms
Epileptologist: if seizure-like episodes need video EEG evaluation

Step 2: Advocate for Yourself

If you are told your tests are normal and nothing is wrong, it is reasonable to ask whether FND has been considered, and what signs in your exam support or rule it out. A good FND diagnosis is based on positive findings, not just on the absence of other diseases. Ask your neurologist to explain the diagnosis in plain terms, and request referrals to therapists who have experience with FND specifically, since general approaches may not fit. If you have seizure-like episodes, a video recording can be very helpful to your doctor. You deserve to be treated as someone with a real neurological condition, because that is what FND is.

Step 3: Your Action Plan

Keep a log of your symptoms, including when they started, what was happening at the time, and what makes them better or worse.
If you have episodes, ask someone you trust to record one on video to share with your doctor.
Ask your neurologist to walk you through the positive exam signs behind your diagnosis.
Read trusted educational material about FND so you understand how it works.
Ask for referrals to physical, occupational or speech therapists with FND experience.
Discuss whether CBT or another form of psychotherapy fits your situation, especially for functional seizures.
Plan with your care team for flare-ups, including what helps and when to check in.

Important: This report is educational information, not medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions.