This sounds like what i have been thinking is happening; a lot of PsA patients get Dx’d with Fibro, when in reality ic could be part of PsA. This study is using RA (of course, they get all the studies), they are measuring FMness in RA patients, by using fMRI imaging of the brain with stimulation and without, what they are finding is the pain is present even with the inflammation under control. That the pain has to do a lot with the nervous system then just the local effect of the inflammation. https://onlinelibrary.wiley.com/doi/full/10.1002/art.40451
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Thanks Jon. Follows my thoughts on the plethora of fibro diagnoses especially on your side of the ponds which is very much creeping over to this side of the pond.