To the editor,
I agree with Lane when he writes that the operative criteria for diagnosing chronic fatigue syndrome (CFS) are unsatisfactory. Some patients who have been assigned this label may be better described as having depression or somatization, and this mislabeling prejudices the understanding of CFS in cross-sectional studies.1 Lane is presumably referring to the definition of the Centers for Disease Control and Prevention, with its concentration on physical symptoms.2 This definition also is not all that helpful in assigning a label to individuals for the purposes of estimating prognosis or deciding on treatment because the physical symptoms cited are nonspecific.
You can read the rest of this comment here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071345/
Source: Robertson-Ritchie H. Toward a new definition of chronic fatigue syndrome. West J Med. 2001 Apr;174(4):241. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071345/ (Full article)