What mental disorders are associated with suicidal behavior?

Of the diagnoses described in a few studies conducted, mood disorders (including depression) were linked to suicide in 30.5 percent of cases, followed by substance-related disorders (with emphasis on alcohol and a minor contribution of drug abuse) at 17 percent; schizophrenia, 14 percent; personality disorders, 12 percent; and other diagnoses, 22 percent. Many of these conditions are co-occurring.