In psychology, codependency is a theory that attempts to explain imbalanced relationships where one person enables another person's self-destructive behavior such as addiction, poor mental health, immaturity, irresponsibility, or under-achievement.Definitions of codependency vary, but typically include high self-sacrifice, a focus on others' needs, suppression of one's own emotions, and attempts to control or fix other people's problems.People who self-identify as codependent exhibit low self-esteem, but it is unclear whether this is a cause or an effect of characteristics associated with codependency. Codependency is not limited to married, partnered, or romantic relationships, as co-workers, friends, and family members can be codependent as well.