Functional neurological deficit refers to an impairment in the nervous system that cannot be attributed to a structural or physiological issue. There are several synonyms for this term, including conversion disorder, functional neurological disorder, and psychogenic movement disorder. These terms are often used interchangeably and refer to conditions where an individual experiences neurological symptoms that cannot be explained through conventional medical tests. In some cases, these symptoms may be indicative of underlying psychological distress or stress. Synonyms for functional neurological deficit highlight the complex interplay between physical and psychological factors that can impact our health and well-being.