Does self-harm increase the risk of subsequent suicide?

Self-Harm Substantially Increases Suicide Risk

Yes, self-harm dramatically increases the risk of subsequent suicide, with individuals who present to healthcare after self-harm having a suicide rate approximately 37 times higher than the general population. 1, 2

Magnitude of Risk

The evidence unequivocally demonstrates that self-harm is the strongest predictor of future suicide:

• Overall suicide incidence after self-harm presentation is 163 per 100,000 person-years, with rates of 260 per 100,000 in men and 95 per 100,000 in women 2
• Among Medicaid adults with deliberate self-harm, the suicide rate reaches 439 per 100,000 person-years in the 12 months following the index event 3
• Previous self-harm episodes increase suicide risk with a hazard ratio of 1.68 (95% CI 1.38-2.05) 4

Temporal Pattern of Risk

The suicide risk is not uniform over time but follows a critical temporal pattern:

• Highest risk occurs in the first year after hospital presentation, with an incidence of 511 per 100,000 person-years 2
• The first month is exceptionally dangerous, with suicide incidence reaching 1,787 per 100,000 person-years 2
• This temporal clustering underscores the urgent need for immediate intervention and close follow-up in the acute post-discharge period 2

Risk Amplification by Method

The method used during self-harm episodes significantly stratifies subsequent suicide risk:

• Violent methods (versus self-poisoning alone) confer a hazard ratio of 7.5 (95% CI 5.5-10.1) for completed suicide 3
• Firearms carry the highest risk with a hazard ratio of 15.86 (95% CI 10.7-23.4) compared to poisoning 3
• Attempted hanging or asphyxiation increases risk 2.7-fold (adjusted OR 2.70,95% CI 1.53-4.78) 2
• Combined self-injury and self-poisoning doubles suicide risk (adjusted OR 2.06,95% CI 1.42-2.99) compared to poisoning alone 2
• Patients using violent methods have an exceptionally elevated risk in the first 30 days (hazard ratio 17.5,95% CI 11.2-27.3) but not significantly thereafter 3

Demographic and Clinical Risk Modifiers

Several factors further amplify baseline suicide risk after self-harm:

• Male gender triples suicide risk compared to females (OR 3.36,95% CI 2.77-4.08) 2
• Age positively correlates with risk, with a 3% increase per year of age (OR 1.03,95% CI 1.03-1.04) 2
• Suicidal intent at the index episode increases risk 2.7-fold (HR 2.7,95% CI 1.91-3.81) 4
• Physical health problems nearly double suicide risk (HR 1.99,95% CI 1.16-3.43) 4

Psychiatric Comorbidity Impact

Coexisting mental disorders dramatically escalate suicide risk following self-harm:

• Bipolar disorder confers the highest risk: adjusted HR 6.3 (95% CI 3.8-10.3) in males and 5.8 (95% CI 3.4-9.7) in females 5
• Nonorganic psychotic disorders yield adjusted HR 5.1 (95% CI 3.5-7.4) in males and 4.6 (95% CI 2.8-7.7) in females 5
• Among patients with bipolar disorder who used non-poisoning methods, 20.4% completed suicide within 3-9 years 5

Special Considerations in Young People

The relationship between self-harm and suicide in adolescents follows similar patterns but with distinct epidemiological features:

• Non-fatal self-harm is very common in youth and is strongly associated with increased suicide risk 1
• For every young male (aged 12-17) who dies by suicide, there are approximately 100 episodes of hospital-presenting self-harm 1
• For every young female in this age group who dies by suicide, there are roughly 1,000 episodes of hospital-presenting self-harm 1
• Self-harm typically begins in early adolescence (ages 10-14) and peaks around age 16 1

Critical Service Gaps

Despite the established high risk, healthcare systems fail to adequately assess and follow these patients:

• 25% of adolescents presenting to emergency departments after self-harm do not receive psychosocial assessment 1, 6
• Of those assessed, only 50% are referred to outpatient mental health services 1, 6
• Of those referred, only 25% attend at least one treatment session 1, 6

Clinical Implications

Given this evidence, every self-harm presentation must be treated as a high-risk event requiring:

• Comprehensive psychosocial assessment after each episode to identify modifiable risk factors 1
• Immediate safety planning rather than relying on risk prediction tools alone 1
• Close follow-up in the first month, when risk is highest 2, 3
• Intensive intervention for violent method users, particularly in the immediate post-discharge period 3
• Aggressive treatment of comorbid psychiatric conditions, especially bipolar disorder and psychotic disorders 5