“…Despite the popularity of the pain-prone model in previous decades, its psychological premises have received limited research attention in chronic pain groups, including FM. Regarding behavioral tendencies to overwork, we found only one related study (Van Houdenhove, Stans, & Verstraeten, 1987) in chronic pain patients, which suggested that these patients were more "action prone" than a healthy control group. Empirical studies have found relationships between unexpressed anger and pain intensity in chronic pain patients (Kerns, Rosenberg, & Jacob, 1994), lower awareness of anger in chronic pain patients compared to other medical patients (Braha & Catchlove, 1986), and greater anger suppression in chronic pain patients as compared to healthy controls (Hatch et al, 1991).…”