::Actually, re-reading it, I think the wording in the pscyosomatic medicine article is ambiguous and could be taken either way.  And as for ulcers, did we ever actually think they were purely physical?  I was at least vaguely aware of the various components and the fact that some were still entirely unexplained, but my wording was, admittedly, a little unclear.  As for stress and gene expression, I was unaware of that and the wiki article makes no reference to it.  Can you provide details?  You've got me curious.