“…14,21 The finding that greater endorsement of the belief that pain is a constant and enduring experience (eg, ''it seems like I wake up with pain and I go to sleep with pain,'' ''my pain varies in intensity but is always with me'') was associated with higher pain intensity and pain interference is compatible with previous studies of people with chronic pain as a primary condition. Several investigators have shown that beliefs about the stability or constancy of pain are positively associated with higher pain intensity, 19,37,39,53 greater psychologic distress, 37,39 and poorer physical functioning. 19,39 Stroud et al 20 similarly found that pain constancy beliefs were positively associated with greater pain interference among 163 people with heterogenous chronic pain conditions, even after controlling for the influence of demographic variables, pain severity, and work status.…”