Abstract: Functional Somatic Symptoms, defined as physical symptoms of unknown pathology, are common in children and adolescents. In addition to their high prevalence, FSS are associated with comorbid psychiatric symptoms, particularly anxiety and depression. Functional abdominal pain, head pain and fatigue are the most common symptoms reported by both community and epidemiological children population. FSS was influenced by multiple risk factors, such as culture, age, gender, family environment and physiological vulnerability. Psychological models were proposed from various theoretical perspectives. Psychological treatments, especially Cognitive- behavior therapy and relaxation and biofeedback intervention were evaluated to be effective for FSS in children.

Key words: children, functional-somatic syndromes, somatization, cognitive–behavior therapy