“…Research has shown that higher levels of psychological flexibility, and its subprocesses (primarily acceptance, mindfulness, committed action) are related to lower symptom severity, physical and psychological disability, interference in work and other daily activities, negative affect, depression and pain-related anxiety, and to more positive affect, better performance of activities, and more emotional stability in chronic pain and chronic fatigue samples (Viane et al, 2003;McCracken and Eccleston, 2005;McCracken and Yang, 2006;Van Damme et al, 2006;McCracken et al, 2007;Vowles and McCracken, 2008;McCracken and Gutierrez-Martínez, 2011;Cho et al, 2013;Trompetter et al, 2015a). An experimental study by Petter and colleagues (2014) showed that an induction of state mindfulness was indirectly related to lower levels of pain and better pain tolerance, mediated by changes in pain catastrophizing.…”