While awareness of non-suicidal self-injury (NSSI) appears to be increasing among school counselors, social workers, nurses, and others who work with youth, it remains one of the most difficult behaviors to encounter, with few professionals feeling well equipped to handle these situations. This introductory article aims to define NSSI, describe its prevalence, and identify common risk factors among adolescents; distinguish NSSI from suicidal behaviors; and explore the motivations for engaging in NSSI. (Contains 1 table.)