The information below is again based on information from the American Association of Suicidology1, and lists various mental and physical disorders that would give a person an increased likelihood of committing suicide. It should be noted that these type of risk factors are all treatable/capable of being modified.
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Psychiatric disorders, especially:
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Mood disorder (particularly depression)
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Anxiety disorder
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Schizophrenia
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Substance use disorder (alcohol abuse or drug abuse/dependence)
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Eating disorders
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Body dysmorphic disorder (an anxiety disorder where someone is excessively concerned about and preoccupied by a perceived defect in their physical features)
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Conduct disorder (a pattern of repetitive behaviour where the rights of others or social norms are violated - symptoms include verbal and physical aggression, cruel behaviour toward people and pets, destructive behaviour, lying, truancy, vandalism, and stealing)
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More than one psychiatric disorder at the same time (depression and alcohol misuse being particularly dangerous)
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A psychiatric disorder and an Axis II personality disorder (especially if the Axis II disorder is antisocial or borderline personality disorders) or an Axis III medical disorder
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Axis II personality disorder, especially category B (Category A: paranoid, schizoid, schizotypal; Category B: antisocial, borderline, histrionic, narcissistic; Category C: avoidant, dependant, obsessive-compulsive). See Axis II personality disorders for more information.
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Axis III medical disorders (brain injuries and other medical/physical disorders which may aggravate existing diseases or present symptoms similar to other disorders, especially if it involves functional impairment and/or chronic pain)
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Traumatic brain injury
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Low self-esteem/high self-hate
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Tolerant/accepting attitude toward suicide
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Lack of acceptance by someone or their family of their sexual orientation
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Smoking
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Perfectionism (especially in context of depression)
Source
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American Association of Suicidology, Factsheet: The Risk Factors for Suicide and suicidal Behaviors, from www.suicidology.org.