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Last updated: August 23, 2021

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Suicide refers to the act of intentionally ending one's own life. If that action fails, it is called a suicide attempt. Suicide and suicide attempts are more broadly considered suicidal behavior. By definition, suicidal behavior requires both general thoughts about suicide and concrete, deliberate plans to act upon those ideas (suicidal ideation). While suicidal ideation can precede suicide and, therefore, should be investigated thoroughly, it often occurs independently of any suicidal behavior. While attempted suicide is more common in women, completed suicide is significantly more common in men. Suicidal ideation is often associated with psychiatric illness (e.g., major depressive disorder, bipolar disorder). The most important diagnostic step is the evaluation of possible suicidal ideation and prior suicide attempts. Acute management is focused on stabilization and preventing imminent acts of suicide (e.g., by admitting the patient to a psychiatric institution). After there is no longer an immediate risk of self-harm, underlying conditions and risk factors must be addressed (e.g., with treatment with antidepressants). Frequent follow-ups beginning soon after initial treatment are vital for preventing the recurrence of suicidal behavior.

  • Suicidal behavior: includes suicide attempts and completed suicide
    • Suicide: the act of intentionally ending one's own life
    • Suicide attempt: a potentially injurious behavior intended to end one's own life that does not result in a lethal outcome
  • Suicidal ideation
    • Any thoughts of or plans to intentionally end one's own life that do not include preparatory behavior
    • Suicidal ideation and behavior are often present simultaneously. [1][2][3]


  • Incidence [4]
    • There are ∼ 47,000 suicides every year in the US.
    • Suicide is the 10th leading cause of death for all ages and the 2nd leading cause in individuals 15–34 years of age.
  • Age
    • Peak incidence: 45–64 years
    • Incidence significantly increases after age 15, with another significant increase after age 45. [4]
  • Sex: > [5]
  • Method: > 50% of suicides are by firearm. [6]

Suicide attempts

Completed suicides are more common in men, while suicide attempts are more common in women. [8]

Epidemiological data refers to the US, unless otherwise specified.

Risk factors for suicidal behavior [9][10][11]

SAD PERSONS are at risk for suicide: Sex (male), Age (> 45 years), Depression, Previous suicide attempt, Ethanol/substance use, Rational thinking loss (psychosis), Sick (chronic disease), Organized plan (acquisition of weapons/tools), No spouse or social support, Stated intent.

General psychiatric evaluation [9][11]

  • Ask specifically and directly about suicidal ideation and concrete intent/plans.
    • Helps evaluate the imminent risk of suicide (i.e., need for hospitalization)
    • Allows for assessment of whether the patient is in a position to act on their plans (e.g., possession of firearms)
  • Investigate potential underlying conditions (e.g., mood disorders, schizophrenia, substance abuse, recent severe psychological stress/trauma).
  • Ask about previous suicide attempts (also within the family), feelings of despair, and ambivalence towards death.
  • If previously depressed and agitated patients suddenly become calm or less symptomatic, the risk of suicidal behavior increases.

Further diagnostics

Sudden improvement of symptoms in depressed patients (e.g., a normally agitated patient who is calm) may indicate an imminent suicide plan.

If there is any reason to suspect suicidal ideation, ask the patient about it!

Acute management [11]

Imminent risk of suicidal behavior [9]

The risk of suicide is imminent if suicidal ideation, intent, and a concrete plan are present.

  • Goal: : risk reduction by actively preventing the patient from suicidal behavior and assuring the patient's safety
  • Approach
    • Hospitalization: preferably admission to a psychiatric unit
      • Ideally, the patient is admitted to the hospital voluntarily.
      • Against the patient's will if the patient is uncooperative and in immediate danger of self-harm
    • Remove hazardous objects from the patient's environment that could be used in a suicide attempt (e.g., remove firearms from home).
    • Do not leave the patient alone or even with his or her family.
    • If necessary, involve the authorities (e.g., local police).
  • Special patient group: If minors are hospitalized due to an imminent risk of suicidal behavior, their parents must be informed; however, parental (or legal guardian) consent for such action is not required.

Elevated risk of suicidal behavior

The risk of suicide is elevated if there is suicidal ideation and intent but no concrete plan is present.

  • Approach
    • Involve the family of the patient and inquire about the patient's psychological and social situation (e.g., history of suicidal ideation, access to firearms, social connections).
    • Take measures to increase the patient's social contacts and interaction with medical professionals.

Long-term management

If antidepressants such as SSRIs are given, the increase in energy and motivation occurs sooner than the improvement in mood. Therefore, suicide risk may increase during the first weeks of treatment. Close observation and frequent follow-ups are vital!

If there is any evidence of suicidal ideation, all firearms should be removed from the patient's home!

Any patient with the intent to act on a concrete suicide plan should be hospitalized immediately!

  • Risk of suicide is generally increased in the following settings:
    • After previous suicide attempt(s)
    • During the first weeks following discharge from psychiatric care
    • During recovery from severe depression
  • To prevent suicide, regular follow-ups should occur:
    • Soon after discharge (ideally within 7 days) [16]
    • Frequently (vital for long-term outcome) [9][17]

One-Minute Telegram 4-2020-2/3: The other epidemic: handgun ownership and suicidality

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  2. Posner K, Oquendo MA, Gould M, Stanley B, Davies M. Columbia Classification Algorithm of Suicide Assessment (C-CASA): classification of suicidal events in the FDA's pediatric suicidal risk analysis of antidepressants.. Am J Psychiatry. 2007; 164 (7): p.1035-43. doi: 10.1176/ajp.2007.164.7.1035 . | Open in Read by QxMD
  3. Guidance for Industry, Suicidal Ideation and Behavior: Prospective Assessment of Occurrence in Clinical Trials. Updated: August 1, 2012. Accessed: October 25, 2019.
  4. 10 Leading Causes of Death, United States - 2017, All Races, Both Sexes. Updated: January 18, 2019. Accessed: September 25, 2019.
  5. Suicide in America: Frequently Asked Questions. . Accessed: September 26, 2019.
  6. Suicide Statistics. Updated: February 9, 2021. Accessed: April 26, 2021.
  7. U.S.A. SUICIDE: 2017 OFFICIAL FINAL DATA. Updated: December 10, 2018. Accessed: October 1, 2019.
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  10. Bachmann S. Epidemiology of Suicide and the Psychiatric Perspective. Int J Environ Res Public Health. 2018; 15 (7): p.1425. doi: 10.3390/ijerph15071425 . | Open in Read by QxMD
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  13. Carlborg A, Jokinen J, Nordström A-L, Jönsson EG, Nordström P. CSF 5-HIAA, attempted suicide and suicide risk in schizophrenia spectrum psychosis. Schizophr Res. 2009; 112 (1-3): p.80-85. doi: 10.1016/j.schres.2009.04.006 . | Open in Read by QxMD
  14. Cipriani A, Pretty H, Hawton K, Geddes JR. Lithium in the prevention of suicidal behavior and all-cause mortality in patients with mood disorders: a systematic review of randomized trials. Am J Psychiatry. 2005; 162 (10): p.1805-1819. doi: 10.1176/appi.ajp.162.10.1805 . | Open in Read by QxMD
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  16. Guidelines for integrated suicide-related crisis and follow-up care in Emergency Departments and other acute settings. Updated: November 1, 2017. Accessed: October 2, 2020.
  17. Fadem B. High-Yield Behavioral Science. Wolters Kluwer Health ; 2012