Hysteria is no longer a medical diagnosis. The term was dropped from psychiatry’s official diagnostic manual decades ago, and no current classification system uses it. But the symptoms once lumped under “hysteria” didn’t disappear. They were reorganized into several modern diagnoses that are still very much in use today, most notably functional neurological disorder (also called conversion disorder) and somatic symptom disorder.
Why Hysteria Was Dropped
The word hysteria comes from the Greek “hystera,” meaning uterus. Hippocrates coined the term in the fifth century BC, building on Egyptian medical texts from around 1900 BC that attributed mysterious symptoms in women to a “wandering uterus” drifting through the body. For nearly four thousand years, this idea persisted in various forms: that unexplained paralysis, seizures, blindness, or speech problems in women were caused by a malfunctioning reproductive system. Ancient treatments included placing foul-smelling substances near the mouth and perfumed ones near the vagina to coax the uterus back into place.
The diagnosis was applied almost exclusively to women and carried enormous stigma. Before 1600, women with these symptoms were sometimes accused of witchcraft. Sensory symptoms that didn’t follow known anatomical patterns were called “devil’s patches” at witch trials and used as evidence of demonic possession. Even into the 19th and 20th centuries, the label effectively dismissed real physical suffering as a female emotional problem. A landmark 1965 follow-up study found that half of patients originally diagnosed with hysteria went on to develop clearly identifiable neurological or psychiatric conditions, revealing a staggering rate of misdiagnosis.
By the late 20th century, the medical community recognized that the term was both scientifically inaccurate and deeply sexist. The third edition of the Diagnostic and Statistical Manual (DSM-III) in 1980 broke “hysteria” apart into separate, more precisely defined conditions. The ICD-9, published in 1978, still included the word in parentheses next to newer terms, but subsequent editions phased it out entirely.
What Replaced It: Functional Neurological Disorder
The closest modern equivalent to classical hysteria is functional neurological disorder, or FND, listed in the DSM-5 as “functional neurological symptom disorder (conversion disorder).” The core feature is one or more symptoms of altered movement or sensation, such as weakness, paralysis, tremor, non-epileptic seizures, speech problems, vision changes, or numbness, that are genuinely experienced but aren’t explained by a known neurological disease. Crucially, the diagnosis now requires positive clinical evidence that the symptoms are inconsistent with recognized neurological conditions, not just that doctors can’t find anything wrong.
Neurologists use specific physical tests to make this diagnosis. Hoover’s sign, for example, tests for functional leg weakness by checking whether the “weak” leg pushes down involuntarily when the patient lifts the other leg. For tremor, doctors use a technique called entrainment: they ask the patient to tap a rhythm with the unaffected hand and observe whether the tremor in the other hand shifts to match that rhythm. These positive signs help distinguish FND from neurological diseases and from faking, which research suggests doctors tend to overdiagnose.
FND is not rare. A 2024 systematic review estimated that 10 to 22 people per 100,000 are newly diagnosed each year, with a minimum prevalence of 80 to 140 per 100,000. That translates to at least 50,000 to 100,000 people living with FND in a country the size of the UK alone, making it more common than many well-known neurological conditions that receive far more research funding. It affects people of all genders, though studies still find an association with female gender and a history of childhood trauma.
Somatic Symptom Disorder
Another piece of what was once called hysteria now falls under somatic symptom disorder, or SSD. This diagnosis applies when a person has one or more physical symptoms, whether or not they have a medical explanation, paired with excessive and persistent thoughts, anxiety, or behaviors related to those symptoms. The distress must last longer than six months and significantly disrupt daily life. Unlike FND, which focuses on neurological symptoms like paralysis or seizures, SSD covers a broader range of physical complaints where the psychological response to the symptoms is disproportionate and consuming.
One important shift in the DSM-5: the diagnosis no longer requires that symptoms be “medically unexplained.” A person with a known medical condition can also receive an SSD diagnosis if their emotional and behavioral response to it is excessive. This was a deliberate move away from the old framework, which too often reduced to telling patients their symptoms weren’t real.
The Legacy of Dismissal
The history of hysteria left a long shadow on how patients with these conditions are treated. For centuries, the diagnosis was essentially a way of saying “we don’t believe you,” particularly if you were a woman. That dynamic hasn’t fully disappeared. Patients with functional neurological disorder still report feeling dismissed or disbelieved, and the process of ruling out other conditions through serial testing can itself increase anxiety rather than provide reassurance.
Modern approaches try to counter this. Neurologists are now encouraged to show patients the clinical signs, like Hoover’s sign, directly. Demonstrating that the nervous system can function normally under certain conditions helps patients understand what’s happening in their body and builds trust. The shift from “we can’t find anything wrong” to “here is the positive evidence of what you have” represents one of the most meaningful changes in how these conditions are handled.
How FND Is Treated Today
Treatment for functional neurological disorder typically combines psychotherapy with specialized physical rehabilitation. Cognitive behavioral therapy helps patients address the psychological factors, such as stress, trauma, or anxiety, that may contribute to their symptoms. Physical therapy and occupational therapy focus on retraining the nervous system, gradually restoring normal movement patterns and function. For many patients, simply receiving a clear diagnosis and understanding the condition is itself therapeutic, because it ends the cycle of uncertainty and repeated testing.
Recovery varies widely. Some people improve quickly once they understand their diagnosis, while others have symptoms that persist for years. The condition is increasingly understood as a problem with how the brain controls and processes body signals rather than as something imaginary or purely psychological. That reframing matters, because it validates the patient’s experience while pointing toward treatments that actually work.