Hysteria was historically considered a female medical condition caused by a wandering uterus. Over time, the definition and believed causes of hysteria changed - it was variously thought to be caused by abstinence, poor blood flow, or psychological trauma. Treatments included pelvic massage or electro-mechanical devices. By 1980, the term "female hysteria" was removed from medical manuals and its symptoms considered manifestations of dissociative disorders rather than a distinct illness.