Quantitative Sensory Testing in Patients with Multisomatoform Disorder with Chronic Pain as the Leading Bodily Symptom, 2019, Tran et al

Paywall, https://academic.oup.com/painmedicine/article-abstract/doi/10.1093/pm/pnz195/5580374/
Scihub, not available at time of posting.

 

I am not sure but I think they must mean physical disease when they talk about somatoform disorders if they are distinguishing them from functional somatic disorders.

Which means they found that "imaginary" diseases have the same problems as physical ones. Then again who knows what these people find.

 

I don't have access to the full paper, but I would imagine what the authors are referring to are the ICD-10 Somatoform disorders:

https://icd.who.int/browse10/2016/en#/F45

F45 Somatoform disorders
F45.0 Somatization disorder
F45.1 Undifferentiated somatoform disorder
F45.2 Hypochondriacal disorder
F45.3 Somatoform autonomic dysfunction
F45.4 Persistent somatoform pain disorder
F45.8 Other somatoform disorders


For expanded disorder description texts, see also:

https://www.who.int/classifications/icd/en/bluebook.pdf

The ICD-10 Classification of Mental and Behavioural Disorders, Clinical descriptions and diagnostic guidelines, World Health Organization

aka the ICD-10 "Blue Book"

(Expanded description texts from Page 129)


See also:

https://www.who.int/classifications/icd/en/GRNBOOK.pdf

The ICD-10 Classification of Mental and Behavioural Disorders, Diagnostic criteria for research, World Health Organization

aka the ICD-10 "Green Book" (Research criteria)

(Diagnostic criteria from Page 127)

-----------------------

If you look at the research criteria (from page 127 onwards) for the ICD-10 Somatoform disorders, particularly for:

F45.0 Somatization disorder,
F45.1 Undifferentiated somatoform disorder,
F45.3 Somatoform autonomic dysfunction, and
F45.4 Persistent somatoform pain disorder

there is potential "overlap" with the so-called "FSSs" and for assigning a diagnosis of one of the ICD-10 Somatoform disorders to patients with symptoms of one or more of the so-called "FSSs".



As you know, DSM-5 replaced DSM-IV's Somatoform disorders categories with Somatic symptom disorder (SSD) in May 2013. I think it unlikely that the paper would be referring to the now deprecated DSM-IV TR Somatoform disorders, though you do still see occasional references to the disorder descriptions and criteria for the now obsolete DSM-IV Somatoform disorders categories in contemporary studies, rather than the DSM-5's SSD criteria which replaced them.

Comparison Table: Criteria for DSM-IV Somatization disorder v ICD-10 Somatization disorder

(You can see how IBS, FM and other of the so-called "FSSs" might, in some cases, meet a diagnosis of Somatization disorder or Persistent somatoform pain disorder.)



[Edited to insert comparison table]