An examination of patients of a pediatric inpatient clinic revealed a variety of psychopathological disorders concomitant to functional autonomic/somatic pathology in children and adolescents as well as the variants of personality deviations and features of the patient's family. Based on this study, we suggest a concept of psychoautonomic diathesis and describe features of its symptoms and course as well as its relation to psychopathological diathesis. Main problems that should be solved to treat effectively functional autonomic/somatic disorders in the frames of psychoautonomic syndrome are presented.