Indifference or hypersensitivity? Solving the riddle of the pain profile in individuals with autism

Tseela Hoffman, Tami Bar-Shalita, Yelena Granovsky, Eynat Gal, Merry Kalingel-Levi, Yael Dori, Chen Buxbaum, Natalya Yarovinsky, Irit Weissman-Fogel

Research output: Contribution to journalArticlepeer-review

Abstract

Excitatory-inhibitory (E/I) imbalance is a mechanism that underlies autism spectrum disorder, but it is not systematically tested for pain processing. We hypothesized that the pain modulation profile (PMP) in autistic individuals is characterized by less efficient inhibitory processes together with a facilitative state, indicative of a pronociceptive PMP. Fifty-two adults diagnosed with autism and 52 healthy subjects, age matched and sex matched, underwent quantitative sensory testing to assess the function of the (1) pain facilitatory responses to phasic, repetitive, and tonic heat pain stimuli and (2) pain inhibitory processes of habituation and conditioned pain modulation. Anxiety, pain catastrophizing, sensory, and pain sensitivity were self-reported. The autistic group reported significantly higher pain ratings of suprathreshold single (P = 0.001), repetitive (46°C- P = 0.018; 49°C- P = 0.003; 52°C- P < 0.001), and tonic (P = 0.013) heat stimuli that were cross correlated (r = 0.48-0.83; P < 0.001) and associated with sensitivity to daily life pain situations (r = 0.39-0.45; P < 0.005) but not with psychological distress levels. Hypersensitivity to experimental pain was attributed to greater autism severity and sensory hypersensitivity to daily stimuli. Subjects with autism efficiently inhibited phasic but not tonic heat stimuli during conditioned pain modulation. In conclusion, in line with the E/I imbalance mechanism, autism is associated with a pronociceptive PMP expressed by hypersensitivity to daily stimuli and experimental pain and less-efficient inhibition of tonic pain. The latter is an experimental pain model resembling clinical pain. These results challenge the widely held belief that individuals with autism are indifferent to pain and should raise caregivers' awareness of pain sensitivity in autism.

Original languageEnglish
Pages (from-to)791-803
Number of pages13
JournalPain
Volume164
Issue number4
DOIs
StatePublished - 1 Apr 2023

Bibliographical note

Publisher Copyright:
© 2023 Lippincott Williams and Wilkins. All rights reserved.

Keywords

  • Autism spectrum disorder
  • Pain modulation profile
  • Pain perception
  • Pronociception
  • Quantitative sensory testing

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology
  • Anesthesiology and Pain Medicine

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