If a patient reports chronic pain despite lacking peripheral tissue damage, which mechanism best explains the heightened pain perception involving spinal dorsal horn nociceptors?

💡 Explanation

Central sensitization occurs because persistent nociceptor activation induces long-term potentiation in dorsal horn neurons via NMDA receptors. This lowers the threshold for pain, therefore, even normal inputs are perceived as painful, rather than reduced sensation from opioid or GABA pathways.

• Why does neuronal damage continue even after initial aggregate formation in Huntington's disease?
• Why does targeted temperature management (TTM) for post-cardiac arrest patients prevent fever above a specified range, such as 32-36°C, after the initial cooling phase?
• Why does carbohydrate digestion decrease in the small intestine when a patient lacks enterokinase?
• As an individual ages, why does prolonged oxidative stress contribute to a decline in collagen production within tendons, reducing their tensile strength?
• Why does intense, prolonged exposure to jet engine noise potentially lead to permanent hearing loss?
• Why does a mutated epidermal growth factor receptor (EGFR) in lung cancer cells increase the likelihood of uncontrolled proliferation, even with functional cell cycle checkpoints?