Functional neurological disorder (FND) can qualify as a disability under both U.S. and UK law, but it isn’t automatically classified as one. Whether FND counts as a disability depends on how severely it affects your daily life and how well you can document that impact. The condition can be as debilitating as Parkinson’s disease or multiple sclerosis, yet many people with FND face an uphill battle getting their disability recognized by benefits agencies and employers.
How Disability Law Defines FND
Neither the Americans with Disabilities Act (ADA) in the U.S. nor the Equality Act 2010 in the UK maintains a fixed list of qualifying conditions. Instead, both laws define disability based on functional impact. Under the Equality Act, you’re considered disabled if you have a physical or mental impairment that has a “substantial and long-term adverse effect” on your ability to carry out normal day-to-day activities. “Substantial” means more than minor or trivial, and “long-term” means lasting at least 12 months. Importantly, the legal test looks at how your condition affects you without medication or treatment, not how you function on a good day with support.
The impairment doesn’t even need to be a formally diagnosed medical condition. If FND leaves you unable to walk reliably, causes seizure-like episodes, or produces fatigue severe enough to limit basic tasks, that functional impact is what matters legally. The ADA uses a similar framework: any physical or mental impairment that substantially limits one or more major life activities qualifies.
How Severe FND Actually Gets
FND is sometimes misunderstood as a mild or psychosomatic condition, which creates real problems when people apply for disability support. In reality, research shows that FND causes impairment in quality of life that is similar to, and in some aspects worse than, what people with Parkinson’s disease or MS experience. Symptoms can include limb weakness or paralysis, tremors, difficulty walking, non-epileptic seizures, speech problems, chronic pain, and cognitive fog.
These symptoms often fluctuate, which is part of what makes FND so difficult to live with and so difficult to prove. You might walk normally one hour and need a wheelchair the next. That variability doesn’t make the condition less disabling. Under UK law, fluctuating or recurring effects still count as long-term if the overall pattern persists for 12 months or more.
Employment data paints a stark picture. A survey of people with functional seizures (one of the most common forms of FND) found that only about 41% were employed. Roughly 28% were classified as not working due to disability. Most participants, around 64%, felt that people with functional seizures should qualify for disability benefits, though about a third believed workplace accommodations or a different job would be more appropriate than full disability.
Applying for Disability Benefits in the U.S.
The Social Security Administration (SSA) does not have a specific listing for FND in its Blue Book, the manual used to evaluate disability claims. This is one of the biggest obstacles. Conditions like epilepsy, ALS, and Parkinson’s disease each have their own listing with clear-cut criteria. FND does not.
That doesn’t mean you can’t qualify. The SSA evaluates neurological disorders that cause “disorganization of motor function, bulbar and neuromuscular dysfunction, communication impairment, or a combination of limitations in physical and mental functioning.” If your FND symptoms match the severity described in one of these existing neurological listings, your claim can be approved through what’s called “medical equivalence,” where your condition is judged to be equally severe even though it isn’t named specifically.
If your FND also causes significant mental health symptoms, such as cognitive difficulties, anxiety, or depression, the SSA can evaluate those under the mental disorders section (12.00) of its guidelines. Many successful FND claims involve documenting both the physical and mental components of the condition.
Why FND Claims Get Denied
The lack of a dedicated listing is only part of the problem. FND is diagnosed partly by exclusion: tests rule out structural neurological disease, and specific clinical signs confirm a functional cause. This means your MRI and blood work may come back normal, which benefits evaluators can misinterpret as evidence that nothing is wrong.
The fluctuating nature of symptoms creates another challenge. If you happen to have a relatively good day during a medical evaluation, the examiner’s notes may not reflect your worst days. And because FND has historically been poorly understood, even within medicine, some evaluators may not take the diagnosis seriously or may categorize it as purely psychological.
To strengthen a claim, thorough documentation from a neurologist is essential. A diagnosis based on positive clinical signs (not just the absence of other conditions) carries more weight. Detailed records of how symptoms affect specific daily activities, such as how far you can walk, how often seizures occur, or how many days per month you’re unable to function normally, give evaluators concrete evidence to work with. Letters from treating physicians that explicitly connect FND symptoms to functional limitations in the SSA’s language can make a meaningful difference.
Workplace Protections and Accommodations
If you’re still working, FND can qualify you for reasonable accommodations under the ADA. Your employer is required to make changes to the work environment or schedule that allow you to do your job, as long as those changes don’t create an undue hardship for the business.
The types of accommodations that help people with FND vary widely depending on symptoms, but common examples include:
- Modified schedules: adjusting start and end times, building in rest breaks, or allowing part-time hours to manage fatigue
- Seating or positioning changes: providing a stool or chair if standing triggers symptoms, or allowing you to alternate between sitting and standing
- Routine consistency: keeping your workspace, shift, or duties stable rather than rotating, since unpredictable changes can worsen symptoms for some people
- Job restructuring: redistributing tasks you physically cannot perform while keeping the essential functions of your role
- Additional leave: allowing time off for flare-ups or medical appointments beyond standard sick leave
You don’t need to disclose your specific diagnosis to request accommodations. You do need to explain the functional limitations and engage in what the law calls an “interactive process” with your employer to identify solutions that work for both sides.
Building a Stronger Case
Whether you’re applying for government benefits or requesting workplace support, the key is translating your experience into functional terms. Agencies and employers don’t evaluate how much pain you’re in or how frustrating your symptoms are. They evaluate what you can and cannot do.
Keep a symptom diary that tracks not just what happens (a seizure, leg weakness, a cognitive fog episode) but what it prevents you from doing and for how long. If you need help bathing on bad days, can’t drive because of unpredictable episodes, or had to leave a job because you couldn’t stand for a full shift, those are the details that build a case. Ask your neurologist and any mental health providers to document the same information in their clinical notes, using language that describes real-world limitations rather than just listing a diagnosis code.
FND is a legitimate neurological condition recognized in the DSM-5, and the diagnostic criteria explicitly require that symptoms “cause significant distress or problems in social, work, or other areas.” That clinical standard aligns closely with how disability law defines impairment. The gap isn’t in the medicine. It’s in the systems that haven’t caught up to the medicine yet.