Suicidality in Depression

Suicidality refers to the spectrum running from thoughts of death and suicidal ideation through suicide attempts to death by suicide. Depressive disorders are among the conditions most strongly associated with this risk, and suicidality is recognised both as a symptom that can occur within a major depressive episode and as a distinct clinical and public-health concern requiring its own assessment.

Definition

Suicidality (suicidal thoughts and behaviour) encompasses suicidal ideation, suicide attempts, and death by suicide. In the context of depression it includes recurrent thoughts of death or suicide that can form part of a major depressive episode, as well as the broader risk of suicidal behaviour associated with depressive disorders.

Scope

This entry covers suicidality as it relates to depression: the terminology of the suicidal spectrum, the association between depression and suicide risk, recognised risk and protective factors, and the evidence on prevention at the individual and population level. It is a reference and educational overview. It does not provide risk-assessment, crisis, or treatment instructions; anyone in crisis should contact local emergency or crisis services.

Core questions

• How are suicidal ideation, attempts, and death by suicide distinguished?
• How strongly, and through what factors, is depression associated with suicide risk?
• What approaches have evidence for preventing suicide at individual and population levels?

Key concepts

• Suicidal ideation
• Suicide attempt
• Death by suicide
• Risk and protective factors
• Means restriction
• Stress-diathesis model of suicidal behaviour
• Distinction between suicidal behaviour and depression as separate constructs

Mechanisms

Reviews describe suicidal behaviour through a stress-diathesis framework in which a predisposition (shaped by genetics, early adversity, impulsivity, and neurobiological factors) interacts with acute stressors and psychiatric illness, including depression. Depression contributes to risk, but suicidal behaviour is understood as partly distinct, with its own contributors rather than being a simple function of depression severity.

Clinical relevance

Recognising that suicide risk can accompany depression is central to compassionate, safe clinical care and to public-health policy. This entry is for reference and education and does not constitute a risk-assessment tool or crisis guidance; concerns about safety should be directed to qualified clinicians and emergency or crisis services.

Epidemiology

Suicide is a leading cause of death worldwide and accounts for a large number of deaths each year, with rates varying by region, sex, and age. Psychiatric disorders, depression prominent among them, are present in a large proportion of people who die by suicide, although most people with depression do not die by suicide, underscoring that depression is a risk factor rather than a deterministic cause.

Evidence & guidelines

Systematic reviews of prevention have found evidence for certain population-level interventions, notably restricting access to lethal means, alongside roles for some pharmacological and psychosocial treatments and for training and gatekeeper programmes, while evidence for other widely used strategies is weaker. Translating this evidence into care follows current clinical and public-health guidance and is outside the scope of this reference entry.

History

Suicide has been studied across disciplines, from Durkheim's sociological work to modern psychiatric and epidemiological research. Over the late twentieth and early twenty-first centuries, the field increasingly framed suicidal behaviour as a partly distinct phenomenon with its own risk factors and prevention science, rather than solely as a symptom of underlying mood disorder.

Debates

Is suicidal behaviour best understood as a symptom of depression or as a distinct phenomenon?

Although depression is a major risk factor, evidence that suicidal behaviour has partly independent contributors has led to debate over whether it should be conceptualised and studied as a separate clinical entity rather than only as a feature of mood disorders.

Which prevention strategies actually reduce suicide?

Systematic review has found stronger evidence for some interventions, such as means restriction, than for others in common use, prompting debate over where prevention resources should be focused.

Seminal works

• turecki-brent-2016
• zalsman-2016

Frequently asked questions

Does having depression mean a person will attempt suicide?

No. Depression is an important risk factor for suicidal thoughts and behaviour, but most people with depression do not attempt or die by suicide. Risk depends on many interacting factors, and depression alone is not deterministic.

What does the evidence say works best for suicide prevention?

Systematic reviews give some of the strongest support to restricting access to lethal means, alongside roles for certain treatments and training programmes. Evidence varies across strategies, and prevention is best delivered within current clinical and public-health systems.