Suicide is one of the leading causes of death among individuals aged 10-24. Research using intensive longitudinal methods to identify near-term predictors of suicidal thoughts and behaviors (STBs) has grown dramatically. Interpersonal factors may be particularly critical for suicide risk among young people, given the heightened salience of interpersonal experiences during adolescence and young adulthood. We conducted a narrative review on intensive longitudinal studies investigating how interpersonal factors contribute to STBs among adolescents and young adults. Thirty-two studies met the inclusion criteria and focused on theoretical and cross-theoretical interpersonal risk factors. Negative interpersonal states (e.g., perceived burdensomeness), hopelessness, and social support were consistently associated with proximal within-person changes in concurrent, but not prospective, suicidal thoughts. Further, work examining how these processes extend to suicidal behavior and among diverse samples remains scarce. Implications for contemporary interpersonal theories and intensive longitudinal studies of STBs among young people are discussed.
Keywords: Adolescents; intensive longitudinal methods; suicide; young adults.