Epilepsy & Seizures
Alcohol withdrawal seizures
Mar. 13, 2023
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Functional neurologic disorder (FND), also known as conversion disorder and functional neurologic symptom disorder, refers to a group of common neurological movement disorders caused by an abnormality in how the brain functions. FND is not caused by another disorder and there is no significant structural damage in the brain. The exact cause of FND is unknown. FND was thought to be a “conversion disorder” by Sigmund Freud because he believed a psychological disorder converted into a neurological one.
Someone with FND can function normally, they just can't at that moment. Their brain is unable to send and receive signals properly and there is a disconnection in the function of the lobes and emotional processing. Memory, concentration, cognition, and the processing of sensations also can be affected.
FND causes real symptoms that significantly interfere with how you function and cope with daily life. If you have FND, your unplanned movements and symptoms occur without you consciously starting them and are inconsistent and distinct from symptoms that are intentionally produced. FND can involve any part of your body. Symptoms may appear suddenly, increase with attention to them, and decrease when you are distracted.
FND can be difficult for you, your family, and doctors to understand. Early diagnosis and treatment can help lessen symptoms and aid in healing.
FND has two primary categories:
There are many types of FND, with a diverse mix and range of neurologic symptoms and disorders. For some people, symptoms are short-lived, while they may last for years for others.
Psychogenic nonepileptic seizures (PNES) may look like generalized or other forms of epileptic seizures but are caused by brain dysfunction and not by abnormal electrical signaling in the brain. You may have episodes of movement, sensation, and behavior similar to an epileptic seizure and may have a temporary loss of attention or memory lapse. You also may have confusion or loss of consciousness without shaking. You might feel “disassociated” (or somewhat disconnected) from thoughts or feelings or from the environment.
PNES can be stress-related, emotional, or psychological reactions to an inability to cope with a sudden or past event or events. They mostly affect women and often begin in young adulthood. Seizures may be frequent and prolonged. With proper treatment, PNES may cease in some individuals or reduce in frequency. Children and adolescents with PNES tend to have a higher rate of recovery.
Functional movement disorder (FND) affects movement of the body. Symptoms may include:
Symptoms that affect other brain functions may include:
Who is more likely to get functional neurologic disorder?
Anyone can develop FND. An estimated four to 12 people per 100,000 will develop FND. Fundamental causes may involve biological factors (such as early childhood trauma and early life stress, emotions, a propensity of anxiety, witness to violence, maltreatment, or childhood sexual abuse) or sociological factors (including interpersonal relationships and stress). Some of these factors can trigger episodes of FND.
The disorder is more common in women and particularly in those who have a history of early life sexual trauma. It can occur but is uncommon in children under age 10. There appears to be an association with depression and anxiety, early life trauma, a dysfunctional family life, and even a dislike of job.
FND sometimes has a psychological cause as one of the relevant factors and may result from a somatic symptoms disorder (characterized predominantly by multi-system symptoms that are associated with distress and/or dysfunction and look like a physical illness).
How is functional neurologic disorder diagnosed and treated?
Diagnosing FND. No single test can confirm a diagnosis of FND. A doctor will assess your health and medical and family history to rule out any neurological or other condition that may cause symptoms since FND can co-exist with other disorders.
A neurologist and a psychiatrist or psychologist may look for specific patterns of symptoms or signs to make a diagnosis.
Tests include physical, neurologic, and psychiatric exams, as well as imaging scans, in part to rule out other disorders, and examine symptoms such as tremor, weakness, walking, and vision.
Other tests such as electromyography (which records the electrical activity in muscles) and electroencephalography (which monitors the brain's electrical activity) can help identify a movement disorder. Video electroencephalography, which records what you are seeing or doing over a period of time (from several hours to days) while brain waves are being recorded until a seizure occurs, can help diagnose PNES and determine if other seizures that have unusual features are actually epilepsy.
What can I do?
Treating FND. There are no specific treatments for FND but there are treatments for some of its symptoms. A team of doctors and health professionals from various specialties work together to deliver a combination of treatments and comprehensive care. Learning that your symptoms are real despite there not being an underlying medical disease can help you to better cope with the disease, become motivated to making change, and aid in recovery. It's also possible to learn techniques to lessen your symptoms. You and your medical team will schedule follow-up appointments. Your family also should be involved to help understand FND and to support you as you deal with your symptoms, treatment, and any stigma associated with the disorder.
If you have PNES with warning signs you may be able to learn techniques to avoid symptoms. Be aware that relapses and flare-ups often recur, despite treatment.
What are the latest updates on functional neurologic disorder?
NINDS researchers are studying the neurobiology of FND and nonepileptic seizures, as well as any clinical association of the effects of the COVID-19 pandemic on individuals with functional movement disorder.
Scientists funded by the NIH are working to better understand the underlying neuropathology of FND and are using magnetic resonance imaging to develop neuroimaging biomarkers—signs that may indicate risk of developing a disease or be used to monitor its progression—for FND and nonepileptic seizures. Among other research, investigators hope to develop a test to diagnose and better treat PNES and to test medications for PNES.
How can I or my loved one help improve care for people with functional neurologic disorder?
Consider participating in a clinical trial so clinicians and scientists can learn more about FND and related disorders. Clinical research uses human volunteers to help researchers learn more about a disorder and perhaps find better ways to safely detect, treat, or prevent disease.
All types of volunteers are needed—those who are healthy or may have an illness or disease—of all different ages, sexes, races, and ethnicities to ensure that study results apply to as many people as possible, and that treatments will be safe and effective for everyone who will use them.
Where can I find more information about functional neurologic disorder?
Information may be available from the following resources:
Functional Neurological Disorders Society
(For physicians and researchers)
Content source: https://www.ninds.nih.gov/health-information/disorders/functional-neurologic-disorder Accessed June 23, 2023.
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