4.4.2.2 Diagnostic and Statistical Manual of Mental Disorders
The DSM-IV did not include the diagnosis of CFS/ME. However Neuroasthenia was classified as Undifferentiated Somatoform Disorder if the symptoms persisted for longer than 6 months. In the updated DSM-V (released in 2013) there has been a change with a new category named ‘Somatic Symptoms and Related Disorders’ replacing Somatoform Disorders. Undifferentiated Somatoform disorder has been removed and a new disorder of Somatic Symptom Disorder included.
Diagnostic criteria for Somatic Symptom Disorder are
A. One or more somatic symptoms that are distressing or result in significant disruption of daily life
B. Excessive thoughts, feelings or behaviours related to the somatic symptoms or associated health concerns as manifested by at least one of the following:
1. Disproportionate and persistent thoughts about seriousness of one’s symptoms.
2. Persistently high level of anxiety about health or symptoms
3. Excessive time and energy devoted to these symptoms or health concerns
C. Although any one somatic symptom may not be continuously present the state of being symptomatic is persistent (typically more than 6 months)
The DSM-V emphasizes that the diagnosis of Somatic Symptom Disorder depends on the distressing somatic symptoms PLUS the abnormal thoughts or behaviours in response to the symptoms (i.e. maladaptive thoughts) rather than an absence of medical explanation for somatic symptoms. It clearly states that it is not appropriate to give a mental disorder diagnosis solely because a medical (physical) cause cannot be found.