Central sensitisation is the phenomenon in which repetitive constant stimulation of the nociceptive system through C-fibre activity results in progressively increasing responses from the dorsal horn cell, thereby causing progressive increase in pain experience.
N-methyl D Aspartate (NMDA) receptor is believed to be an important factor contributing to this phenomenon.
The term “wind up” arises from the similarity of a sensitized dorsal horn cell to a “wound-up” spring, which causes exaggerated response even to a gentle stimulus.
Suzuki R, Sikandar S, Dickenson AH. Nociception: basic principles. In: Bruera ED, Portenoy RK (eds) Cancer Pain Assessment and Management. Cambridge University Press . Cambridge 2010, P 6.