article (Jan. 29, 07) on The Brain and Stress. I've posted just a paragraph below. where Bruce McEwen, a neuroendocrinologist at Rockefeller Univ. dais "We're learning that post-tramatic stress disorder (PTSD), burnout, chronic fatiguesyndrome and fibromyalgia are related in some ways." What's emerging is a complex picture of the body's response to stress that involves several interrelated pathways. Scientists know the most about cortisol because until now that has been the easiest part to measure. "But when one thing changes, all the others change to some degree," says Bruce McEwen, a neuroendocrinologist at Rockefeller University who has spent decades studying the biology of stress, primarily in animals. So just because you see an imbalance in one area doesn't mean you understand why it is happening. "We're learning that post-traumatic stress disorder (PTSD), burnout, chronic fatigue syndrome and fibromyalgia are all related in some ways," McEwen says. The next step is to figure out if there are any genetic predispositions that tip the response to stress toward one set of symptoms or another.