To better understand problematic medical patients, the psychiatric dia
gnoses of 448 patients referred to a behavioral medicine clinic were e
xamined. Forty-two percent met DSM-III-R personality disorder criteria
. Analysis of the comorbidity of Axis I and Axis II diagnoses revealed
a statistically significant co-occurrence between somatoform and pers
onality disorders (P < 0.0001). Some of the difficulties in making a p
ersonality disorder diagnosis are reviewed, as are reasons why knowled
ge of personality disorder diagnoses is important to medical providers
.