Thoughts of taking one's own life.

Suicidal ideation, or suicidal thoughts, is the thought process of having ideas or ruminations about the possibility of completing suicide. It is not a diagnosis but is a symptom of some mental disorders, use of certain psychoactive drugs, and can also occur in response to adverse life circumstances without the presence of a mental disorder. On suicide risk scales, the range of suicidal ideation varies from fleeting thoughts to detailed planning...