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What experimental evidence is there that chronic pain is psychosomatic?

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There’s also some evidence that stress can significantly increase risk of autoimmune disease which can make this whole argument a bit circular. We don’t have great categories yet for discerning between “real” and “psychosomatic” pain.

Even pain as a concept is poorly labeled and understood.

Personal experience with it has convinced me that’s the case.

Not positive of course, but I’ve also spent a decade looking into chronic pain and at first was strongly against the idea it could be psychological. I was wrong and accepting that has helped me get better.

Some other sources are Unlearn your pain by Sarno, and a bunch of other books.

Also there’s a lesswrong post I can’t paste for some reason but it’s called “The mind-body vicious cycle of RSI and back pain.”

I’ve got a few more bookmarks I’ve collected over the years I can dig up if you’re curious. No solid RCTs as far as I have studied but lots of personal and anecdotal evidence.

I definitely wouldn’t die on the hill that most or even 50% of chronic pain is psychological, but I do think it is a large component. I’m a fan of the bio-psycho-social model of pain myself.

Having had some recurring back spine/nerve related pain after an accident, I'm a bit dubious on the psychosomatic front.

Maybe my pain was just entirely biological because pain killers surely fixed my shit up for a few hours. While not medicated I could "choose" to ignore the pain and it would go away for a while but it would return basically any time I moved "the wrong way" or was "reminded" of my problem spots by a sharp stabbing of pain when rotating my upper torso in a specific way.

I think the idea is more like this:

You have an injury, brain tightens certain muscles to protect them --> The muscles heal over time, but you have a trapped prior around constricting that area --> If you can't get muscles to release, constant muscular tension begins to cascade into other muscles and areas of the body.

Which implies that painkillers and muscle relaxants can relieve pain for far longer than they're supposed to last in such cases by helping to break the cycle.

Which conforms to my personal experience as well. Though I'd expect cases of chronic pain to be filtered a bit against cases where that works.