Suicide: definition, causes, prevention, and social impact

Characteristics, warning signs, and risk factors

Suicidal behaviour is complex and rarely has a single cause. Many people who die by suicide have an identifiable mental health condition such as major depression, bipolar disorder, or schizophrenia, though not everyone with these diagnoses will be suicidal. Other risk factors include a history of previous attempts, substance misuse, chronic or terminal medical illness, recent losses or major life changes, social isolation, and exposure to bullying or violence. Protective factors include social support, access to effective healthcare, and coping skills.

• Mental health disorders (depression, bipolar disorder, psychotic disorders)
• Previous suicide attempts and self-harm
• Substance use and acute crisis states
• Chronic physical illness and pain
• Social or economic stressors and relationship breakdown

Epidemiology and historical notes

Patterns of suicide vary by age, sex, culture and over time. In many countries suicide is a leading cause of death among adolescents and young adults, and risks differ between university populations and older adults. Historical attitudes toward suicide have ranged from criminalization and stigma to medicalization and prevention; modern public-health approaches emphasize prevention, early identification, and treatment. Reliable data collection and culturally informed interpretation are important because reporting practices and definitions have changed across eras and regions.

Prevention, assessment, and immediate response

Preventive efforts include population-level measures (restricting access to common means, public education, and destigmatizing care), community support, and clinical management of mental disorders. When someone expresses a plan, intent, or ongoing desire to die, it is a medical concern that typically warrants prompt evaluation by trained professionals. A formal suicide risk assessment can help determine immediate safety needs and appropriate care. If a person appears at imminent risk, they should not be left alone and someone should seek emergency help or contact crisis services.

• Encourage open, nonjudgmental conversation about feelings.
• Remove or limit access to lethal means when possible.
• Connect the person to health professionals for assessment and follow-up.
• Provide social support and practical help; follow up after crises.

Impact, distinctions, and notable facts

Each suicide affects families, friends, coworkers, and communities; broader consequences include economic costs and long-term bereavement effects. Distinctions in terminology, such as "attempted suicide" versus "died by suicide," matter in clinical and legal contexts and can influence stigma. While depression is a frequent factor linked with suicide risk, many other contributors—acute crises, substance use, or psychosis—play critical roles. Suicidal behaviour is often preventable with timely, appropriate interventions.

Where to seek more information and support

Reliable information and services are available through educational institutions, healthcare systems, and community organizations. For help with suicidal thoughts or to learn more about assessing risk, consider resources for students and young adults available through campus services such as college counseling. Someone experiencing thoughts of self-harm can learn more about recognizing suicidal thinking at information sites and should treat urgent concerns as a medical emergency. A formal suicide risk assessment by a qualified clinician can clarify immediate needs. Terms such as chronic and acute help describe how long problems have been present, while broader categories like mental illness and specific diagnoses such as depression or schizophrenia are relevant to clinical evaluation. Suicide can be a symptom of underlying disorders and is often precipitated by stress or life events. If you or someone you know is at risk, reach out to local emergency services or mental health professionals immediately.