I've just been exploring my local Chronic Pain Service's website and came across a link to this video: https://www.youtube.com/watch?v=bt9Yhg8XNMs [In the top left there is an icon which links to the playlist of the 6 videos covering the complete lecture] In it the speaker mentioned a term new to me, 'Chronic Overlapping Pain Conditions', which appears to be putting a range of distinct medical conditions into one generic term, much the same as the 'Medically Unexplained Symptoms' approach is doing. I've only just started looking at this subject, but came across the following USA based publication which clearly puts 'ME/CFS' into this group of conditions: http://www.chronicpainresearch.org/public/CPRA_WhitePaper_2015-FINAL-Digital.pdf I haven't read through it yet and so am unsure of how it relates to the MUS BPS approach or indeed if it is a positive or negative clinical/research agenda, but wanted to post the information now (otherwise I'll forget to do it).