Now that this thread is separated I am happy to respond.
Similar threads can be found here:
http://forums.phoenixrising.me/index.php?threads/mind-body.24076/
http://forums.phoenixrising.me/inde...gh-catecholamines-and-low-blood-volume.30470/
http://forums.phoenixrising.me/inde...on-psychoneuroimmunological-hypothesis.23909/
http://forums.phoenixrising.me/inde...riables-in-cfs-role-of-graded-exercise.21514/
In absolutely every case of "psychological" processes we could substitute brain processes. Thoughts are most likely outcomes of brain activation. Intention is a slippery word, and to debate it would necessitate getting into deep philosophy. Its not a great idea to go there.
There are indeed thought processes that occur in disease, and the original aim of psychosomatic medicine was to examine these. That was a valid concept. Then psychosomatic came to be viewed differently as a result of work first by Charcot then Freud, a student of Charcot. This changed the focus of the study on how thought and disease interact, which is potentially a scientific question, to how thought drives disease. It rapidly descended into a whole lot of interacting circular fallacies which I am still trying to tease out.
A simplistic interpretation is that Freud was primarily saying emotion causes disease, whereas modern CBT proponents are saying that thought causes disease. I have no doubt that how we think can modify the disease experience. I do not think it can cause disease, though I think it can exacerbate it.
Most of the validity of these approaches are, in my view, about improving disease coping. CBT used for this purpose has some grounding. When however the argument is used to try to justify disease causation, as they have done with many diseases, its complete psychobabble. Were they right for tuberculosis, epilepsy, diabetes, gastric ulcers, MS, Lupus, rheumatoid arthritis, etc. etc. etc. ? Not once have they been right in claiming a disease is psychosomatic. They are losing the fight for claiming psychogenic causation in ME, FMS, IBS and so on, as the biology is being revealed.
Psychological processes with respect to brain function has some scientific credibility, psychological processes with respect to mind has history and dogma, philosophy and rhetoric, but no science to speak of.
PS I forgot the big one! Psychogenic proponents spent years trying to claim cancer had mental causation. This was especially true for breast cancer, as "everyone knows" women are weak willed. We forget just how much nonsense psychobabble has claimed in the past.