Self-destructive behavior is any behavior that is harmful or potentially harmful towards the person who engages in the behavior.
Self-destructive behaviors have been shown by many people throughout the years. It is on a continuum, with one extreme end of the scale being suicide. Self-destructive actions may be deliberate, born of impulse, or developed as a habit. The term however tends to be applied toward self-destruction that either is fatal, or is potentially habit-forming or addictive and thus potentially fatal. Self-destructive behavior is often associated with mental illnesses such as borderline personality disorder or schizophrenia.