Depending on one's behavior other than purging, self-induced vomiting can be a sign of bulimia nervosa, anorexia nervosa (purging subtype), or eating disorder not otherwise specified (ed-nos). The DSM V may also include a new eating disorder called Purging Disorder.
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Well.. If they do it like repetitively and they do it after they eat so they don't gain weight then it's probabaly an eating disorder.. Which would be bulimia. I hope that helps.