Understanding Deliberate Self-Harm and Suicide: Definitions and Key Differences

When we talk about deliberate self-harm and suicide, we are often dealing with concepts that get conflated – treated as two names for the same thing. They are not. While both involve intentional injury to oneself, they differ in crucial ways: in definition, in motivation, and in what they tell us about a person’s inner state. Getting these definitions right is not just an academic exercise – it shapes how we understand, assess, and respond to people in profound distress.

What is self-harm?
The many names for self-harm
Why people self-harm
What is suicide?
Origin and etymology of the term
Scale of the problem
Key differences between self-harm and suicide
Suicidal ideation
Suicide attempt
Completed suicide and lethality
The relationship between self-harm and suicide risk

What is self-harm?

Deliberate self-harm (DSH) refers to an acute, non-fatal act carried out deliberately, in which a person injures themselves – with or without the intention to die. One widely cited definition describes it as a preoccupation with deliberately hurting oneself without conscious suicidal intent, often resulting in damage to body tissue. The most common forms include cutting, burning, hitting, or self-poisoning – but the defining feature is not the method; it is the deliberateness of the act.

Importantly, the intention to end life may be entirely absent, or present only to a variable degree. This is what makes deliberate self-harm conceptually distinct from a suicide attempt, even though the two can overlap in practice.

The many names for self-harm

The terminology surrounding self-harm has been notoriously inconsistent across clinical and academic literature, and this inconsistency has caused genuine confusion in research and treatment settings. Self-harm is also known by several other terms including self-injurious behaviour (SIB), self-mutilation, non-suicidal self-injury (NSSI), parasuicide, deliberate self-harm (DSH), self-abuse, and self-inflicted violence.

Among these, parasuicide deserves specific attention. The term was introduced by Kreitman and colleagues to refer to a non-fatal act of deliberate self-injury or deliberate self-poisoning, and deliberately excluded any judgment about whether the person wanted to die. It was coined to describe a behaviour – not an intention. The term deliberate self-harm (DSH) was later proposed by Morgan to serve as a single umbrella term covering deliberate self-poisoning and deliberate self-injury, regardless of intent. Today, the DSM-5 uses the term non-suicidal self-injury (NSSI) to describe intentional self-inflicted damage to the surface of the body carried out without suicidal intent – though this definition does not cover cases of self-poisoning carried out with no intent to die.

Why people self-harm

Self-harm is typically used as a coping mechanism – a way to manage overwhelming emotional pain rather than to end life. A person may feel a temporary sense of relief after the act, followed by guilt or shame, which can perpetuate the cycle. When a person is hurt, endorphins are released into the bloodstream, and this physiological response partly explains why self-harm can become habitual and difficult to stop, functioning almost like an addiction. The key point is that individuals who self-harm generally do not wish to end their life – they are trying to cope with it.

Prevalence data reinforces how significant this issue is. The lifetime prevalence of deliberate self-harm in Europe and the United States is approximately 3% to 5% of the population, and this figure has been increasing. Among adolescents, rates are particularly concerning – studies report that roughly 15% of teenagers and between 17% and 35% of college students have engaged in self-injurious behaviours.

What is suicide?

Suicide is the deliberate act of ending one’s own life. Unlike self-harm, the defining feature of suicide is intent to die. Where self-harm may be an attempt to manage life, suicide is an attempt to leave it.

Origin and etymology of the term

The word itself has a relatively recent history. Evidence suggests that suicide was first coined by Sir Thomas Browne, appearing in his book Religio Medici published in 1643. The word derives from the Latin sui (of oneself) and caedere (the act of slaying) – literally, “the killing of oneself.” Before this term became established, English speakers used expressions such as self-homicide and self-murder, which carried heavy moral and legal condemnation. The shift toward the word suicide reflected a gradual movement, under Enlightenment thinking, away from condemning the act toward understanding its causes – sinners and criminals began to be reframed as victims and patients.

Today, the CDC defines suicide as death caused by self-directed injurious behaviour with any intent to die as a result of that behaviour. This definition underscores that intent is the operative element – it is what separates suicide from accidental death and from deliberate self-harm.

Scale of the problem

Worldwide, over 720,000 people die by suicide each year, making it the third leading cause of death among people aged 15 to 29. In 2021, the CDC reported that 12.3 million adults in the United States developed suicidal thoughts, 3.5 million made plans, 1.7 million attempted suicide, and 48,183 died by suicide – numbers that illustrate the vast gap between thinking about suicide and dying by it.

Key differences between self-harm and suicide

The most fundamental distinction between self-harm and suicide is intent. With suicide, the intent is to end one’s life and escape pain; with self-harm, the intent is to find relief from emotional pain while continuing to live. But understanding the full picture requires looking at where along the spectrum a person may be – because the journey from distress to self-harm to suicidal thinking does not follow a single, predictable path.

Suicidal ideation

Suicidal ideation refers to the thought process of having ideas or ruminations about the possibility of dying by suicide. It is not a diagnosis in itself, but a symptom – and it exists on a spectrum. Passive suicidal ideation involves a general wish to die or not to exist, without any concrete plan. Active suicidal ideation involves a specific plan and a determined intent to act. Ideation accompanied by intent and a plan is considered a psychiatric emergency.

A crucial finding from research is that approximately two-thirds of individuals with suicidal ideation never make a suicide attempt. This means that while suicidal thoughts are always serious and warrant attention, they do not automatically translate into action. Factors such as access to lethal means, degree of hopelessness, and prior attempts play a significant role in determining who moves from thinking to acting.

Suicide attempt

A suicide attempt is defined as a non-fatal, self-directed behaviour carried out with any intent to die as a result. A suicide attempt may or may not result in physical injury – what defines it is not the outcome, but the intention behind it. This is a key clinical distinction: a person may survive a highly lethal attempt, or be seriously injured by what they believed would cause only minor harm.

Research has identified clear demographic differences between those who attempt suicide and those who die by suicide. Those who attempt are more likely to be female, under 35, and to use methods of lower lethality in settings where rescue is probable. Those who die by suicide are more often male, older, and use more violent and lethal methods. In 2021, the CDC reported approximately 35 suicide attempts for every completed adult suicide – a ratio that underscores just how many people survive their attempts.

Completed suicide and lethality

Completed suicide refers to a death that results from the act. The term is preferred in clinical settings over phrases like “successful suicide,” which carries an unintended connotation. Among people who survive even medically serious suicide attempts, more than 90% do not go on to die by suicide – a finding that has important implications for intervention and recovery.

Lethality – the potential of a method to cause death – is a critical variable that distinguishes self-harm from suicide attempts and completed suicide. The physical severity of self-harm is not a reliable indicator of suicidal intent, particularly in adolescents who may underestimate the toxicity of substances they ingest. A person may cause serious physical harm without any intention to die, while another may attempt suicide using a method that causes minimal injury.

The relationship between self-harm and suicide risk

While self-harm and suicide are distinct, they are not unrelated. Almost half of people who self-harm report at least one suicide attempt, and the risk is not static – it can change over time. More than half of individuals with deliberate self-harm present with significant suicide risk, and as the variety of self-harm methods increases, so does the likelihood of a suicide attempt. This is why every person who self-harms should be assessed for suicide risk – not because the two are the same, but because one can become a pathway to the other if underlying distress is left unaddressed.

Understanding these definitions and distinctions clearly is essential – for clinicians, for those supporting someone in distress, and for public awareness. Using precise language matters: calling a self-harm episode a “suicide attempt” when it was not, or dismissing suicidal ideation as “just thoughts,” can both lead to inadequate care. The more accurately we name what is happening, the better positioned we are to respond.

What do you think? Given that the majority of people with suicidal ideation never make an attempt, what factors do you think are most important in determining who receives timely help – and what barriers might prevent someone from seeking it? If self-harm and suicide are defined so differently, why do you think they are still so often grouped together in everyday conversations and media coverage?

References

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Table of Contents

What is self-harm? 🔗

The many names for self-harm 🔗

Why people self-harm 🔗

What is suicide? 🔗

Origin and etymology of the term 🔗

Scale of the problem 🔗

Key differences between self-harm and suicide 🔗

Suicidal ideation 🔗

Suicide attempt 🔗

Completed suicide and lethality 🔗

The relationship between self-harm and suicide risk 🔗