Bulimia nervosa is an eating disorder characterized by binge eating and purging to prevent weight gain. Common symptoms include eating binges, purging through vomiting or laxative abuse, excessive exercise, and going to the bathroom after meals. Physical signs include dry mouth, cuts on fingers, dehydration, and inflammation of the throat. Treatment often involves support groups, cognitive behavioral therapy, and antidepressant medication if other treatments are unsuccessful. Bulimia most commonly affects adolescent and young adult females and can potentially lead to death due to conditions like hypokalemia and cardiac arrest if not properly treated.