The relationship of self-mutilation to suicidal behavior was studied i
n 108 borderline inpatients (defined by the Diagnostic Interview for B
orderline Patients). Patients with histories of self-mutilation were c
ompared to those with no self-mutilation on diagnostic comorbidity, sy
mptom patterns, prior suicidal behaviors, and attempt characteristics,
including number of attempts, seriousness of intent, and medical leth
ality. Self-mutilation was found in 63% of patients, suicidal attempts
in 75.7%. Patients with self-mutilation were significantly younger an
d more symptomatic than controls, and had more serious suicidal ideati
on and recent suicide attempts. On the DIB they had significantly more
manipulative suicide threat or effort, depersonalization and drug-fre
e hallucinations or delusions. They tended toward more depression and
schizotypal symptoms but less anger and assaultiveness compared to non
-mutilating patients. Histories of manipulative suicide attempts were
characteristic of self mutilating patients; however, self mutilation w
as not associated with increased seriousness of intent or lethality of
suicide attempts.