Are illness perceptions related to future healthcare expenditure in patients with somatoform disorders?

BACKGROUND Somatoform disorders are costly for society in terms of increased healthcare expenditure. Patients' illness perceptions have been found to play a role in somatoform disorders. However, it is unclear whether illness perceptions predict higher health costs in these patients. METHOD A total of 1785 primary care patients presenting a new health complaint completed a questionnaire on their illness perceptions and emotional distress before the consultation. The physicians completed a questionnaire for each patient on diagnostics after the consultation. In a stratified subsample, physician interviewers established diagnoses of DSM-IV somatization and undifferentiated somatoform disorders (n = 144) using the Schedules for Clinical Assessment in Neuropsychiatry. Healthcare expenditure was obtained from Danish health registers for a 2-year follow-up period. RESULTS Patients had more negative perceptions of their well-defined physical health problems when they had a co-morbid somatoform disorder. A strong illness identity [β = 0.120, 95% confidence interval (CI) 0.029-0.212, p = 0.012], perceived negative consequences (β = 0.010, 95% CI 0.001-0.019, p = 0.024), a long timeline perspective (β = 0.013, 95% CI 0.005-0.021, p = 0.001), low personal control (β = - 0.009, 95% CI -0.015 to -0.002, p = 0.011) and negative emotional representations (β = 0.009, 95% CI 0.002-0.017, p = 0.020) predicted healthcare expenditure in somatoform disorders. CONCLUSIONS The results suggest that illness perceptions play a role in the perpetuation of symptoms in somatoform disorders and predict higher future healthcare expenditure among a subgroup of these patients.