Psychogenic nonepileptic seizures (PNES) are still poorly understood. Because there are no positive clinical criteria for PNES, there is no consensus about its definition, nor clarity about the underlying nosology, pathophysiology, or the suitable treatment. PNES most commonly occur in the form of conversion and dissociative symptoms, which are historically linked to a trauma-related disease called hysteria. Recently, it has been observed that PNES patients show high rates of traumatic experiences, in particular childhood abuse, and posttraumatic stress disorder (PTSD). This suggests that PNES may arise as a clinical expression of a PTSD pattern whose cardinal feature is the predominance of dissociative and conversion phenomena. Emerging evidence also raise the possibility that the dissociative/conversion subtype of PTSD may occur as a result of poor parental care and family dysfunction, which are associated with - and may therefore cause - somatoform symptoms, including PNES. Methodological limitations do not permit the confirmation of these hypotheses. Stronger research designs are needed, such as prospective and case-control studies.
psychogenic nonepileptic seizures; posttraumatic stress disorder; childhood abuse; dissociative disorders; somatoform disorders