Alcoholism has a significant impact on families. In fact, there are between 28 million and 34 million children and adults in America who are members of alcoholic families. There are many emotional and interpersonal consequences for adult children of alcoholics (ACAs), who often suffer from health problems complicated by unresolved emotional issues related to their families of origin. This article describes the family dynamics that affect the ACA's ability to deal with life stresses, outlines the general characteristics of adults who have a history of family alcoholism, discusses assessment techniques and describes resources available to assist the ACA toward recovery. Also described is the role of the primary health care provider in the treatment of ACAs.