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Suicide is the intentional act of causing one's own death. It is a significant public health issue, affecting individuals worldwide. The usual onset for suicide is between the ages of 15–30 and 70+, with higher prevalence in males than females. Various factors contribute to the risk of suicide, including mental disorders, substance abuse, and socio-economic issues.

Risk Factors

Mental disorders such as depression, bipolar disorder, schizophrenia, personality disorders, anxiety disorders, and substance abuse are primary risk factors for suicide. Physical conditions like chronic pain, traumatic brain injury, and chronic fatigue syndrome also contribute to the risk. Social factors including unemployment, poverty, and discrimination can trigger suicidal thoughts. Genetics accounts for 38% to 55% of suicidal behaviours.


Suicide results from a complex interplay of behavioural, socio-economic, and psychological factors. Low levels of brain-derived neurotrophic factor (BDNF) and serotonin are associated with suicide. Epigenetic changes in response to environmental factors also play a role in determining suicide risk.

BDNF - Brain-derived neurotrophic factor (violet) and NT-4 heterodimer (blue).
BDNF - Brain-derived neurotrophic factor (violet) and NT-4 heterodimer (blue).


Effective suicide prevention includes treating mental disorders and substance misuse, limiting access to suicide methods, and improving social and economic conditions. Cognitive behavioural therapy (CBT) and dialectical behaviour therapy (DBT) can improve outcomes in those with suicidal thoughts. Crisis hotlines and follow-up care for those who have attempted suicide may also be beneficial.

Suicide prevention sign on the Golden Gate Bridge.
Suicide prevention sign on the Golden Gate Bridge.


Treatment for those at risk of suicide involves addressing underlying mental health conditions. Hospitalisation might be necessary for those who are actively suicidal, and outpatient mental health treatment can be arranged for those at lower risk. Dialectical behaviour therapy (DBT) and certain medications like lithium and clozapine may help reduce suicidal thoughts.


The leading methods of suicide vary by region and include hanging, pesticide poisoning, and firearms. Hanging is the most common method in many countries, accounting for 53% of male suicides and 39% of female suicides. Pesticide poisoning is prevalent in developing countries, while firearms are more common in the United States.

Deaths by gun-related suicide versus non-gun-related suicide rates per 100,000 in high-income countries in 2010.
Deaths by gun-related suicide versus non-gun-related suicide rates per 100,000 in high-income countries in 2010.


Globally, suicide accounts for approximately 1.4% of all deaths, with a mortality rate of 11.6 per 100,000 persons per year. Rates differ significantly by country and demographics, with higher rates observed in men, particularly elderly men. The countries with the highest rates include Greenland, Lithuania, Japan, and Hungary.

Death rate from suicide per 100,000 as of 2017.
Death rate from suicide per 100,000 as of 2017.

Social and Cultural Aspects

Views on suicide are influenced by cultural, religious, and philosophical perspectives. In many religions, suicide is considered a sin. Legal perspectives on suicide vary, with some countries decriminalising it, while others maintain penalties for attempted suicide.

Suicide rates by age.
Suicide rates by age.

Self-assessment MCQs (single best answer)

What is the usual onset age range for suicide?

Which mental disorder is NOT listed as a primary risk factor for suicide?

What percentage of suicidal behaviours is attributed to genetics?

Which neurotransmitter's low levels are associated with suicide?

What is a primary method of suicide prevention?

Which therapy is specifically mentioned as helpful for individuals with suicidal thoughts?

Which medication is noted for reducing suicidal thoughts?

What is the most common method of suicide in many countries?

Which country is listed as having one of the highest suicide rates?

What is the global mortality rate from suicide per 100,000 persons per year?


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