What is the difference between psychological factors and physical factors in the diagnosis of chronic pain syndrome?

At trial it became apparent that diagnoses of chronic pain syndrome, fibromyalgia, chronic myofacial pain, fibrositis, or some other variant name for chronic pain following trauma, involve some psychological factors, and the doctors who testified about these syndromes held a wide range of opinions about whether these are purely psychological problems or some mix of physical and psychological problems. I agree with Ritter J. in Beger v. MacAstocker Estate,[11] it does not matter what label the doctors ascribe to the plaintiff’s experience of pain; what it relevant to my analysis is that the plaintiff suffers pain in a number of parts of her body.