Psychiatric disorders occur more often among alcoholics than among the general population. The psychiatric disorders that alcoholics most frequently experience include mood disorders (e.g., depression), anxiety disorders, and antisocial personality disorder. The evaluation of psychiatric symptoms in alcoholic patients is complicated by the multiple relationships that exist among heavy drinking, psychiatric symptoms, and personality factors. For example, alcoholics with co-occurring depression may be at greater risk of psychosocial problems, relapse, and suicide. Conversely, heavy drinking may produce or worsen symptoms of depression or anxiety. Although clinical experience provides general guidance for treating these patients, further research is needed to develop effective psychosocial and pharmacological therapies aimed at specific combinations of psychiatric and addictive disorders.