Causes+Causes+are+unknown.+Psychosocial+theory_ Symptoms as social communication to express emotions or to symbolize feelings. Psychoanalytic interpretation: Symptoms as repressed instinctual impulses. Biological studies : Individual may have a faulty perception and assessment of sensory inputs. Genetic data: Somatoform disorders tend to run in families with an occurrence of % in first degree female relatives. Anxiety and depression are more common in the families of somatizing children.