"You would have every right to be offended if someone said your pain was all in your head. But the truth is, pain is constructed entirely in the brain. This doesn’t mean your pain is any less real – it’s just that your brain literally creates what your body feels, and in cases of chronic pain, your brain helps perpetuate it."
( via https://www.arthritis.org/health-wellness/healthy-living/man... )
or
"Is Pain a Construct of the Mind?"
https://www.scientificamerican.com/article/is-pain-construct...