 This study fulfills the national Veterans Health AdministrationDepartment of Defense VHADoD Task Force recommendation that complementary, integrative therapies for pain management be provided to Veterans. Chronic pain elicits stress which increases sympathetic output fostering autonomic nervous system imbalance, an overextended stress response, fatigue, depression and insomnia. Heart Rate Variability HRV is a measure of the interplay between the sympathetic and parasympathetic nervous systems, and thus is a useful and easily-measured index of autonomic balance that has a relationship to chronic pain effects. HRV biofeedback HRV-B is a novel, biobehavioral procedure that restores normal autonomic balance. Through HRV-B, patients increase parasympathetic cardiac output and restore autonomic balance via induction of HRV coherence. The investigators pilot study indicated that HRV-B produced coherence and alleviated self-reported ratings of chronic pain and stress among Veterans attending the investigators Pain Clinic. The proposed clinical intervention will further test hypotheses that HRV-B increases HRV coherence, reduces self-reported pain, stress, depression, fatigue, and insomnia, and improves cognition among Veterans with chronic pain. 