“…However, social comparisons with better-off "others" while focusing on differences (upward contrast), or with worse-off "others" while perceiving similarities (downward identification) would lead to negative affect (Buunk et al, 1990;Smith, 2000). In chronic illness or pain, social comparison "strategies" such as upward identification and downward contrast have been associated with lower depression and better psychosocial adjustment (Van der Zee et al, 1996, 2000Terol et al, 2012); and upward contrast or downward identification have been linked to higher depression and worse adjustment (Neugebauer et al, 2003;Terol et al, 2007bTerol et al, , 2014. In the same way, a few studies on FM have shown that upward identification or downward contrast strategies are related to lower pain perception and better mood (Affleck et al, 2000;Terol et al, 2014;Cabrera-Perona et al, 2017) and upward contrast or downward identification are associated with higher levels of anxiety and depression, and worse psychological adjustment (Affleck et al, 2000;Groothof and Scholtes, 2007;Terol et al, 2014;Cabrera-Perona et al, 2017).…”