Self-destructive behavior (self-mutilationSelf-mutilation Self-destructive behavior (self-mutilation). It may be an aspect of stereotypic behavior and the result of boredom. Self-injury may also be caused by chronic pain/itching or by a central nervous system disorder. Synonyms: autotomy, automutilation, self-injury.). It may be an aspect of stereotypic behaviorStereotypic behaviour A phenomenon that appears as a response to chronic stress. It is manifested as a set repeated pattern of seemingly purposeless activity. and the result of boredom. Self-injury may also be caused by chronic pain/itching or by a central nervous system disorder. Synonyms: autotomy, automutilation, self-injury.