The phenomenon you experience as pain _usually_ starts as a signal from a physical pain receptor somewhere in your body, but for people with chronic pain, the problem is how those signals get interpreted by the brain. They are effectively getting false positives, whether those receptors are being stimulated or not.
That’s why [phantom limb pain](https://www.ncbi.nlm.nih.gov/books/NBK448188/) is possible. There, the brain is interpreting pain signals as coming from receptors that no longer exist.
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