Therapeutic influence, and sometimes coercion, is believed to be responsible for the huge number of people diagnosed in the 1980s and 1990s with:

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The phenomenon of "therapeutic influence" or "iatrogenic creation" refers to the unintentional creation or exacerbation of symptoms through the therapeutic process or interaction with mental health professionals. Multiple personality disorder (now known as dissociative identity disorder) was a controversial diagnosis during the 1980s and 1990s, and some experts believe that it was overdiagnosed due to therapeutic influence or coercion.

Therapeutic Influence, and Sometimes Coercion, Is Believed to Be Responsible