Can the risk for suicide be inherited?

There is growing evidence that familial and genetic factors contribute to the risk for suicidal behavior. Major psychiatric illnesses, including bipolar disorder, major depression, schizophrenia, alcoholism and substance abuse, and certain personality disorders, which run in families, increase the risk for suicidal behavior. This does not mean that suicidal behavior is inevitable for individuals with this family history; it simply means that such persons may be more vulnerable and should take steps to reduce their risk, such as getting evaluation and treatment at the first sign of mental illness.

Does depression increase the risk for suicide?

Although the majority of people who have depression do not die by suicide, having major depression does increase suicide risk compared to people without depression. The risk of death by suicide may, in part, be related to the severity of the depression. New data on depression that has followed people over long periods of time suggests that about 2% of those people ever treated for depression in an outpatient setting will die by suicide. Among those ever treated for depression in an inpatient hospital setting, the rate of death by suicide is twice as high (4%). Those treated for depression as inpatients following suicide ideation or suicide attempts are about three times as likely to die by suicide (6%) as those who were only treated as outpatients. There are also dramatic gender differences in lifetime risk of suicide in depression. Whereas about 7% of men with a lifetime history of depression will die by suicide, only 1% of women with a lifetime history of depression will die by suicide.

Another way about thinking of suicide risk and depression is to examine the lives of people who have died by suicide and see what proportion of them were depressed. From that perspective, it is estimated that about 60% of people who commit suicide have had a mood disorder (e.g., major depression, bipolar disorder, dysthymia). Younger persons who kill themselves often have a substance abuse disorder in addition to being depressed.

Does alcohol and other drug abuse increase the risk for suicide?

A number of recent national surveys have helped shed light on the relationship between alcohol and other drug use and suicidal behavior. A review of minum-age drinking laws and suicides among youths age 18 to 20 found that lower minimum-age drinking laws was associated with higher youth suicide rates. In a large study following adults who drink alcohol, suicide ideation was reported among persons with depression. In another survey, persons who reported that they had made a suicide attempt during their lifetime were more likely to have had a depressive disorder, and many also had an alcohol and/or substance abuse disorder. In a study of all nontraffic injury deaths associated with alcohol intoxication, over 20 percent were suicides.

In studies that examine risk factors among people who have completed suicide, substance use and abuse occurs more frequently among youth and adults, compared to older persons. For particular groups at risk, such as American Indians and Alaskan Natives, depression and alcohol use and abuse are the most common risk factors for completed suicide. Alcohol and substance abuse problems contribute to suicidal behavior in several ways. Persons who are dependent on substances often have a number of other risk factors for suicide. In addition to being depressed, they are also likely to have social and financial problems. Substance use and abuse can be common among persons prone to be impulsive, and among persons who engage in many types of high risk behaviors that result in self-harm. Fortunately, there are a number of effective prevention efforts that reduce risk for substance abuse in youth, and there are effective treatments for alcohol and substance use problems. Researchers are currently testing treatments specifically for persons with substance abuse problems who are also suicidal, or have attempted suicide in the past.

What does "suicide contagion" mean, and what can be done to prevent it?

Suicide contagion is the exposure to suicide or suicidal behaviors within one's family, one's peer group, or through media reports of suicide and can result in an increase in suicide and suicidal behaviors. Direct and indirect exposure to suicidal behavior has been shown to precede an increase in suicidal behavior in persons at risk for suicide, especially in adolescents and young adults.

The risk for suicide contagion as a result of media reporting can be minimized by factual and concise media reports of suicide. Reports of suicide should not be repetitive, as prolonged exposure can increase the likelihood of suicide contagion. Suicide is the result of many complex factors; therefore media coverage should not report oversimplified explanations such as recent negative life events or acute stressors. Reports should not divulge detailed descriptions of the method used to avoid possible duplication. Reports should not glorify the victim and should not imply that suicide was effective in achieving a personal goal such as gaining media attention. In addition, information such as hotlines or emergency contacts should be provided for those at risk for suicide.

Following exposure to suicide or suicidal behaviors within one's family or peer group, suicide risk can be minimized by having family members, friends, peers, and colleagues of the victim evaluated by a mental health professional. Persons deemed at risk for suicide should then be referred for additional mental health services.

Is it possible to predict suicide?

At the current time there is no definitive measure to predict suicide or suicidal behavior. Researchers have identified factors that place individuals at higher risk for suicide, but very few persons with these risk factors will actually commit suicide. Risk factors for suicide include mental illness, substance abuse, previous suicide attempts, family history of suicide, history of being sexually abused, and impulsive or aggressive tendencies. Suicide is a relatively rare event and it is therefore difficult to predict which persons with these risk factors will ultimately commit suicide.

The National Hopeline Network 1-800-SUICIDE provides access to trained telephone counselors, 24 hours a day, 7 days a week. Or for a crisis center in your area, go here.

next: Suicide Statistics For Completed Suicides and Attempted Suicides