Major change #3: Combine somatization disorder, hypochondriasis, undifferentiated somatoform disorder, and pain disorder into a new category entitled “Complex Somatic Symptom Disorder” (CSSD)

Combine somatization disorder, hypochondriasis, undifferentiated somatoform disorder, and pain disorder into a new category entitled “Complex Somatic Symptom Disorder” (CSSD) which emphasizes the symptoms plus the patients’ abnormal cognitions (Barsky, Lowe, Rief). The term “complex” is intended to denote that in order for this diagnosis to be made, the symptoms must be persistent and must include both somatic symptoms (criterion A) as well as cognitive distortions (criterion B).

This is a major change in the diagnostic nomenclature, and it will likely have a major impact on diagnosis. It clarifies that a diagnosis of CSSD is inappropriate in the presence of only unexplained medical symptoms. Similarly, in conditions such as irritable bowel syndrome, CSSD should not be coded unless the other criterion (criterion B—attributions, etc) is present.

It is unclear how these changes would affect the base rate of disorders now recognized as somatoform disorders. One might conclude that the rate of diagnosis of CSSD would fall, particularly if some disorders previously diagnosed as somatoform were now diagnosed elsewhere (such as adjustment disorder). On the other hand, there are also considerable data to suggest that physicians actively avoid using the older diagnoses because they find them confusing or pejorative. So, with the CSSD classification, there may be an increase in diagnosis.  

The proposal is to group together these heretofore separately recognized disorders because in fact, there are 3 diverse sources suggesting considerable overlap among them.

1. A 2009 study found that 52% of physicians surveyed indicated that there was “a lot of overlap” and an additional 38% thought that there was “some overlap” across these disorders. In contrast, less than 2% of physician respondents felt that these were “distinctly different disorders (Dimsdale, Sharma, & Sharpe, unpublished).

2. There are limited data regarding overlap in clinical settings. One primary care study, for instance, found that 20% of somatization disorder patients also had hypochondriasis (Escobar, 1998). In primary care patients, somatization disorder was 5 times ( Fink et al 2004) to 20 times (Barsky et al 1992) more common in hypochondriasis patients as compared to primary care patients without hypochondriasis.

3. Treatment interventions are similar in this group of disorders.  Cognitive behavior therapy (CBT) and antidepressant medications appear to be the most promising therapeutic approaches for hypochondriasis, somatization disorder, and pain disorder (Kroenke 2007; Sumathipala 2007).  Although several variations of CBT have been employed, they share many elements in common.  These include the identification and modification of dysfunctional and maladaptive beliefs about symptoms and disease, and behavioral techniques to alter illness and sick role behaviors and promote more effective coping.  The literature on the use of antidepressants is more limited, but it too does not suggest any major distinctions in therapeutic response across these different disorders. In addition to these patient centered commonalities of treatment, all of these disorders benefit from specific interventions with the patient’s non-psychiatric physician (e.g. scheduling regular appointments as opposed to prn appointments, limiting testing and procedures unless clearly indicated) (Allen 2002).

A key issue is whether the guidelines for CSSD describe a valid construct and can be used reliably. A recent systematic review (Lowe, submitted for publication) shows that of all diagnostic proposals, only Somatic Symptom Disorder reflects all dimensions of current biopsychosocial models of somatization (construct validity) and goes beyond somatic symptom counts by including psychological and behavioral symptoms that are specific to somatization (descriptive validity). Predictive validity of most of the diagnostic proposals has not yet been investigated.

Please see the full rationale document here.