Background: Psychological and personality factors may be as
important as, or more important than, pathological processes in the experience
of pain, particularly in patients whose pain has a vague or uncertain
source.
Methods: Validated measures of psychological factors were used to
prospectively evaluate fifty-six patients with a single, discrete pain
complaint and fifty-one patients with vague, diffuse idiopathic arm pain. Pain
was assessed with use of 10-point Likert scales, the Pain Anxiety Symptoms
Scale, the Pain Catastrophizing Scale, the Wahler Physical Symptom Inventory,
the Body Consciousness Questionnaire, and the Multidimensional Health Locus of
Control Scale.
Results: Patients with idiopathic arm pain reported more severe pain
at rest (p = 0.02) and with repeated movements (p = 0.01); exhibited higher
levels of cognitive anxiety (p = 0.008); demonstrated greater helplessness (p
= 0.002), pain magnification (p = 0.007), and overall catastrophic coping
mechanisms for dealing with pain (p = 0.005); and showed a tendency for
increased somatic complaining (p = 0.07). A multiple logistic regression model
identified the total score on the Pain Catastrophizing Scale as the sole
predictor of idiopathic pain complaints.
Conclusions: Pain complaints without a clear physical cause are
common and are frustrating for both patients and physicians. Awareness of the
psychological factors associated with idiopathic arm pain may lead to more
effective interventions designed to improve coping mechanisms while at the
same time limiting the use of meddlesome and potentially harmful diagnoses and
treatments.