Vol. 84, No. 1 (Winter 2020) 35 Chad Wetterneck is a cognitive behavior specialist and clinical supervisor at Rogers Memorial Hospital, Oconomowoc, Wisconsin. R. Sonia Singh is a Postdoctoral Psy- chology Fellow at the South Central Mental Illness Research, Education and Clinical Center (MIRECC), Central Arkansas Veterans Healthcare System, North Little Rock, Arkansas, and Department of Psychiatry, University of Arkansas for Medical Sciences, Little Rock. Douglas W. Woods is dean of the graduate school in the Department of Psychology at Marquette University, Milwaukee, Wisconsin. The authors would like to thank Andrew Cameron for his help with data scoring and analysis. Correspondence may be sent to R. Sonia Singh, Central Arkansas Veterans Healthcare System, 2200 Fort Roots Dr., North Little Rock, AR 72114; e-mail: Rajinder.Singh2@ va.gov (Copyright © 2020 The Menninger Foundation) Hair pulling antecedents in trichotillomania Wetterneck et al. Hair pulling antecedents in trichotillomania: Their relationship with experiential avoidance Chad Wetterneck, PhD R. Sonia Singh, PhD Douglas W. Woods, PhD In this study, 285 adults who met criteria for trichotillomania (TTM) via self-report completed an online, cross-sectional survey examining antecedent phenomenological experiences pertaining to hair pulling along with measures of TTM severity and expe- riential avoidance (i.e., avoidance of or escape from unwanted thoughts or feelings). Results showed a heterogeneous depiction of antecedent experiences. Subsequent analyses revealed that certain antecedents were not signifcantly related to TTM severity but were signifcantly correlated with higher levels of experiential avoidance. In particular, four of fve classes of antecedents (i.e., bodily sensations, physical symptoms, mental anxiety, and general uncomfortableness) were signifcantly related to greater experien- tial avoidance. The authors conclude that treatments may need to be designed to address specifc private antecedents, and that this may be done through targeting experiential avoidance. Bulletin of the Menninger Clinic, 84[1], 35–52) Keywords: trichotillomania, hair pulling, avoidance