Bulimia nervosa is an eating disorder characterized by binge eating followed by purging behaviors to prevent weight gain. It is a severe mental disorder caused by a combination of psychological, environmental, genetic, and cultural factors that influence a person's self-esteem and desire to feel in control. People with bulimia engage in binge eating secretly followed by forced vomiting, laxative abuse, or excessive exercise. Long-term effects of bulimia include electrolyte imbalances, dental problems, digestive issues, and potentially life-threatening consequences like heart problems or kidney failure. Treatment involves admitting the problem, reducing symptoms, and using a combination of medication and therapy.