Bulimia nervosa is a severe eating disorder characterized by binge eating followed by purging to prevent weight gain, and it is classified as a mental illness due to its significant impact on mental health stemming from intrusive thoughts and behaviors. Treatment options include cognitive behavioral therapy (CBT) and dialectical behavioral therapy (DBT), which aim to help individuals develop healthier relationships with food and cope with emotional stress. Seeking help from trained specialists is crucial for effective recovery and the prevention of severe physical and psychological consequences.