Anxiety disorders: differential diagnosis and their relationship to chronic pain.

Anxiety disorders are the most prevalent type of mental disorder, and they frequently co-occur with various medical conditions, including chronic pain. Anxiety disorders are associated with higher health care costs, and comorbid chronic pain and anxiety disorder leads to worse outcomes. Despite their prevalence, anxiety disorders often go unrecognized in pain care facilities, compromising clinical benefit of pain treatment. Differential diagnosis among the anxiety disorders can be very difficult, and the high comorbidity with mood disorders, unexplained physical symptoms, and medical disorder makes the precise assessment complicated. Nevertheless, a better understanding of the research and theory that has accumulated can help clinicians accurately diagnose, conceptualize, and treat the patient's symptomatology. In this paper, the authors provide comprehensive review of the diagnostic criteria, epidemiology, differential diagnosis, and relation to chronic pain.