*The difference between illness anxiety disorder and somatic symptom disorder is that in the former they are not complaining of having symptoms, just preoccupied with concern that they ''might'' have a serious undiagnosed disease (e.g. brain tumor). | *The difference between illness anxiety disorder and somatic symptom disorder is that in the former they are not complaining of having symptoms, just preoccupied with concern that they ''might'' have a serious undiagnosed disease (e.g. brain tumor). |