Scratching and noxious heat stimuli inhibit itch in humans: A psychophysical study

G. Yosipovitch, M. I. Duque, K. Fast, A. G. Dawn, R. C. Coghill

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

Background: Patients who suffer from chronic itch employ creative techniques to alleviate their itch, often using painful thermal stimuli, such as hot and very cold showers, as well as mechanical stimuli, such as scratching. Objectives: The present study examined whether the sensory perception of itch is attenuated by remote interactions between both thermal and mechanical stimuli and afferent information related to itch. Patients and methods: Itch was induced with histamine iontophoresis in 21 healthy young subjects. Repetitive thermal stimuli including innocuous warmth, innocuous cool, noxious cold and noxious heat as well as scratching were applied 3-cm distal to the area of histamine iontophoresis. Subjects rated their perceived intensity of histamine-induced itch with a computerized visual analogue scale. Results: Itch intensity ratings were significantly reduced during each period of scratching and repeated noxious heat and cold. Innocuous cooling and warming did not significantly alter itch intensity ratings. Inter-individual differences in histamine-induced itch sensitivity were unrelated to inter-individual differences in pain sensitivity. Conclusions: The present psychophysical study demonstrates that repetitive noxious thermal and scratching stimuli inhibit itch and do not require direct physical interaction with the area of the skin from which itch originates.

Original languageEnglish (US)
Pages (from-to)629-634
Number of pages6
JournalBritish Journal of Dermatology
Volume156
Issue number4
DOIs
StatePublished - Apr 1 2007
Externally publishedYes

Keywords

  • Histamine
  • Innocuous thermal stimuli
  • Noxious cold
  • Noxious heat
  • Scratching
  • Visual analogue scale

ASJC Scopus subject areas

  • Dermatology

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