Eating disorders often are long-term illnesses that may require long-term treatment. In addition, eating disorders frequently occur with other mental disorders such as depression, substance abuse, and anxiety disorders.The earlier these disorders are diagnosed and treated, the better the chances are for full recovery. This fact sheet identifies the common signs, symptoms, and treatment for three of the most common eating disorders: anorexia nervosa, bulimia nervosa, and binge-eating disorder.