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There was an article recently posted on HN. It's about itches and neurology, really long and slightly disgusting, still recommend it:

https://news.ycombinator.com/item?id=8359390

[...] but perhaps also the hundreds of thousands of people in the United States alone who suffer from conditions like chronic back pain, fibromyalgia, chronic pelvic pain, tinnitus, temporomandibular joint disorder, or repetitive strain injury, where, typically, no amount of imaging, nerve testing, or surgery manages to uncover an anatomical explanation. [...]