First of all, “scratching to stop itching” is objective, so eye itching is why you rub your eyes. Rubbing causes the receptors to receive nociceptive signals and transmit them to the nervous system, which activates itch-related interneurons and inhibits the transmission of itch signals, resulting in “scratching to stop the itch. However, excessive rubbing of the eyes can lead to “more itching”. This is because excessive eye rubbing increases the nociceptive signal, and the strong nociceptive signal stimulates the analgesic effect of the nociceptive inhibitory system, which in turn increases the transmission of itch-promoting information, thus “itching more and more”. In addition, excessive rubbing can increase the edema of the eye tissue and prolong the repair time.
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