The American journal of psychiatry
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Comparative Study
Psychiatric status of patients with primary fibromyalgia, patients with rheumatoid arthritis, and subjects without pain: a blind comparison of DSM-III diagnoses.
The major purpose of this study was to compare the frequency of the occurrence of DSM-III diagnoses in patients with primary fibromyalgia syndrome, patients with rheumatoid arthritis, and subjects without pain. ⋯ The Psychiatric Diagnostic Interview data failed to discriminate in any major way between primary fibromyalgia syndrome (a disorder with no known organic etiology) and rheumatoid arthritis (a disorder with a known organic etiology). Therefore, these data do not support a psychopathology model as a primary explanation of the symptoms of primary fibromyalgia syndrome.