Bulimia is diagnosed when a person discloses typical binging or purging behavior to a healthcare provider. The provider then assesses their symptoms and medical history and conducts a clinical interview to make the diagnosis. According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) a person is considered to have bulimia nervosa if they binge at least once a week for 3 months. People with purging-type bulimia use vomiting, laxatives, diuretics, or enemas after binging, whereas those with nonpurging bulimia engage in other compensatory behaviors, like fasting or excessive exercise.[1][2]
How is bulimia nervosa diagnosed?
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•Last Updated: May 16, 2025
Bulimia nervosa is diagnosed when a person reports binging or purging behaviors to a healthcare provider, who then evaluates their symptoms and medical history. According to the DSM-5, a diagnosis requires binge eating at least once per week for 3 months, and distinctions are made between purging and nonpurging types based on compensatory behaviors.