Non-suicidal self-injury (NSSI) is deliberate self-inflicted physical harm without suicidal intent. Common methods: cutting (most common in clinical samples), burning, hitting, severe scratching, interfering with wound healing. Distinct from suicidal self-harm in intent — the patient is not trying to die.
NSSI typically functions as affect regulation, not as suicide attempt. Patients describe: relief from overwhelming emotion, physical sensation amid dissociation ("feeling something when I felt nothing"), communication of distress when words fail, self-punishment in response to shame, distraction from emotional pain through physical pain. The act is purposeful in its function even when destructive.
NSSI added as a condition for further study in DSM-5 — proposed but not formally adopted as a separate diagnosis. Criteria under research: 5+ days in past year of self-injury without suicidal intent; behavior produces relief from negative feelings, resolves interpersonal difficulty, or induces positive feelings; not socially sanctioned. The pattern is common — particularly among adolescents and young adults — and clinically meaningful regardless of formal diagnostic status.
Epidemiology: lifetime prevalence around 17-20% of adolescents, 13% of young adults, 5-6% of adults. Female predominance (though male NSSI is often underrecognized — methods may differ). Often begins in adolescence (peak ages 12-15), may persist or remit in adulthood.
Comorbidities: borderline personality disorder (NSSI is one of the BPD criteria, though most patients with NSSI don't have BPD), major depression, anxiety disorders, eating disorders (substantial overlap), PTSD, substance use disorders.
Distinguishing from suicidal self-harm:
NSSI typically does not intend death; suicide attempts do.
NSSI typically functions for emotional regulation; suicide attempts function to end suffering or life.
NSSI is often chronic in pattern (recurrent episodes); suicide attempts are typically less frequent but more lethal.
Methods often differ — NSSI typically uses methods unlikely to be lethal (superficial cutting, burning) at non-lethal locations.
But NSSI is also a predictor of future suicide attempts. Patients with NSSI history have substantially elevated risk of future suicide attempts. The two phenomena overlap clinically even when distinct in intent. Effective NSSI treatment may reduce suicide risk.
Treatment:
DBT has the best evidence — developed in part for this purpose. Addresses affect regulation, distress tolerance, mindfulness skills. Substantial reduction in NSSI frequency in patients who engage with full DBT program.
CBT targeting NSSI functions, replacement behaviors, addressing comorbid conditions.
Mentalization-based therapy (MBT) for patients with substantial BPD features.
Treatment of comorbid conditions — depression, anxiety, eating disorders, substance use — often substantially reduces NSSI.
Avoid shame-based responses from clinicians, families, or systems. Punitive responses (school suspension for cutting marks, withdrawal of privileges) often worsen the pattern. Empathetic engagement with the function of the behavior produces better outcomes.
Family education matters — families often respond with fear, anger, or surveillance that escalates the pattern. Family-based approaches with skills training and validation reduce family-driven escalation.
When you encounter a patient with NSSI, take the account of function seriously. The behavior is purposeful even when destructive. DBT, treatment of comorbid conditions, family involvement when appropriate. Outcomes can be excellent with structured treatment.