“…CPPs had higher scores in the items anxiety/depression of CBCL and anxiety/shyness of CPRS scales with respect to CGPs, with a statistically significant difference. Several previous studies showed that comorbid depression and anxiety were common in chronic pain patients (Cooper et al, 2017; Cucchiaro et al, 2017; Cunningham et al, 2016; Gureje, 2007; Khan et al, 2015; Martínez, Gómez-Restrepo, Ramírez, & Rodríguez, 2016; Simons, Sieberg, & Claar, 2012; Vinall, Pavlova, Asmundson, Rasic, & Noel, 2016; Zis et al, 2017). Neurobiological factors (genes, hormones, and neural networks) shared between chronic pain and symptoms of psychological distress such as anxiety and depression may partly explain their co-occurrence.…”