Codependency is an unhealthy reliance on the other person in a relationship. It often refers to a spousal relationship yet can also happen in a parent/child or other type of relationship. Codependency can be present in the spouse or child of someone with alcoholism, yet it also occurs in relationships with people who have mental or physical illnesses. Treatment can help the codependent person learn to focus on his or her own needs, to have self-esteem that’s not dependent on the relationship, and to change the current relationship or find a healthier one.