In many of psychiatric disorders, family history is considered as a risk factor and effective element in prognosis and determination of types of treatments. Although in Etiology of conversion disorder, factors such as classic conditioning, psychodynamic and biological factors were considered ,familial type of this disorder was reported and discussed less.

In this study, a seven members family is introduced, in which four of them, mother and three of daughters, have completely alike type of conversion disorder. They all pseudo hallucinate giant, frightening teeth of unknown animal, and as a consequence they feel Globus Hystricus, Dyspenia, and finally Syncope. At the end, researchers discuss about the role of genetic, gender, learning, and psychodynamic factors which cause similar unique symptoms in this family with conversional family.