This really interests me because just this week I've been struggling to resolve a lower back flare up with classic CRPS burning, hypersensitivity, vascular changes etc. However I woke up Saturday morning with a streaming nose from a fairly extreme dose of hay fever.
The miraculous thing was the back pain was gone.
Yesterday morning the hay fever was completely gone but the back was burning again.
I got stuck in to mirror therapy and things are almost calmed again.
I'm not sure if hay fever can be considered higher order processing but I do know the constant sneezing and streaming nose were pretty dominating. Some members of my google group have noticed the same thing happen to them. This lends weight to the new understanding of the part the brain plays in pain.
To read this article and learn more go to the link to the left of this blog under "articles of interest".