Background: Suicide is classified as the highest cause of death among young people compared to other age groups and is the second leading cause of death during childhood and adolescence. many people who have attempted suicide in their lives during their youth, the beginning of thinking about suicide and attempted suicide usually occurs before the mid-twenties. Substance use disorder and suicide usually occur among adolescents. In young people receiving treatment for substance use, 18% to 36% report a history of patients with suicidal behavior. Furthermore, adolescents diagnosed with substance use disorder were 5 to 13 times more likely to die from suicide than adolescents without this diagnosis.
Objective: To find the association of suicidality among adolescents and substance use disorder.
Patients and Methods: The sample consisted of  50 adolescent diagnosed with substance use disorder and 50 adolescent diagnosed with other psychiatric disorder not included substance use disorder and their age were range from 12 to 18 years old. After diagnosed clinically, according to DSM-5 through a designed semi structured interview and through application of Mini International Neuropsychiatric Interview for children and adolescents, suicidal probability scale, teen addiction severity index, and Questionnaire of parental attitudes.
Results: there was a direct relationship between of addiction and susceptibility to suicide. It was found that there were statistically significant differences between the control and sample groups in terms of family history of addiction. It was found that 68% of the sample cases have a family history of addiction compared to 26% of the control and found that 32% of the sample cases have no family history of addiction compared to 74% of control. There were statistically significant differences in the sample for a major depressive episode, dysthymia, post-traumatic stress disorder, attention deficit hyperactivity disorder and generalized anxiety disorder. For the control, there were statistically significant differences for a particular phobia. There was a relationship between substance used  disorder  and comorbidity of psychiatric disorder.
Conclusion: The results of the study showed that there was a relationship between the severity of addiction and susceptibility to suicide and that there were many psychiatric disorders associated with substance use disorder.