Childhood Risk Factors for Adults With Medically Unexplained Symptoms: Results From a National Birth Cohort Study

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Abstract
OBJECTIVE: The purpose of this study was to test the hypothesis that the prior experience of physical illness in childhood is associated with later experience of medically unexplained symptoms. METHOD: A nested case-control study was performed within a prospective birth cohort study: the Medical Research Council National Survey of Health and Development. The 5% most symptomatic individuals at age 36 years were identified and screened for physical illness. Subjects without defined physical diagnoses (N=191) were compared with the remainder of the sample (N=3,107) for childhood exposures. RESULTS: There was a powerful relationship between poor reported health of the parents when subjects were aged 15 years and symptoms at age 36; the relationship was independent of current psychiatric disorder. Medically unexplained symptoms were associated with abdominal pain in childhood but not with defined childhood diseases. CONCLUSIONS: Medically unexplained symptoms appear to be related to prior experience of illness in the family and previous unexplained symptoms in the individual. This may reflect a learned process whereby illness experience leads to symptom monitoring.

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