Hysteria [extra Quality] -

While the clinical term faded, the phenomenon did not. Today, we call it (MPI), or more commonly, mass hysteria. These are outbreaks of physical symptoms—nausea, fainting, tics, seizures—spreading through a social group without an organic cause.

: In the 19th century, Jean-Martin Charcot redefined it as a neurological disorder, even documenting "male hysteria," while Freud later shifted the focus to repressed sexual trauma and "conversion". PubMed Central (PMC) (.gov) Additional Noteworthy Perspectives Hysteria