By Kristine Burneko, MSN, APRN, PMHNP-BC, APHN-BC Introduction Psychoneuroimmunology (PNI) is a multidisciplinary field that examines the tridirectional interaction of psychological processes, neurological activity, and immune function. Within clinical practice, PNI provides the mechanistic foundation for mind–body medicine, an evidence-based approach that complements conventional biomedical care by enhancing psychophysiological regulation and response to concurrent treatmen