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Background: Suicide is an important problem for social safety and health.This phenomenon is costly for remedy.Suicidal thoughts have been found to be increased among Chronic Posttraumatic Stress Disorder (PTSD) patients.We investigated the suicidal thoughts survived from the Bam Earthquake, which occurred on 5 Dec 2003.Methods: 40 chronic PTSD patients were randomly selected and compared with 40 healthy control subjects.Beck Scales for Suicide Ideation (BSSI) of all participants were evaluated.Results: The PTSD patients scored significantly higher than the control group on the suicide risk measure.The highest rate of suicidal thoughts belonged to age rank of 25-30 years (35.8 %), which occurred in female (65.6 %), married people (63.2 %) urban society (62.1%) and patients without past chronic physical illness or psychiatric history and without pre-attempt suicide.Conclusion: The present study indicates that injury to the self or to the loved ones, damage to home or property, or the loss of family members as a result of the earthquake enhances the suicidal tendencies.This research is indicating various risk factors such as sex, age, marriage status, residing place of society are important.