According to the textbook, phantom limb pain might reflect:

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Phantom limb pain is the sensation of pain originating from a limb that is no longer present. Recent studies suggest that phantom limb pain might reflect cortical reorganization within the brain, as the brain seeks to compensate for the loss of sensory input from the amputated limb. This reorganization can lead to increased excitability in the brain regions that formerly processed sensory information from the amputated limb, which in turn causes the sensation of pain.

According to the Textbook, Phantom Limb Pain Might Reflect