There are several synonyms for the term "conversion reaction," a psychological disorder where a person experiences physical symptoms without any medical cause. One is "functional neurological disorder," which refers specifically to the manifestation of neurological symptoms without a medical explanation. "Psychogenic non-epileptic seizures" is another synonym, describing seizures that resemble epilepsy but do not have a neurological cause. "Somatoform disorder" is a broader term that encompasses multiple physical symptoms with no underlying medical cause. Lastly, "hysterical neurosis" is an outdated term, but it was frequently used in the past to describe conversion reactions, stemming from the idea that these symptoms were caused by repressed emotions.