"Dr. Jekyll and Mr. Hyde." "Fight Club." "Shutter Island." If you're a person who enjoy books, TV, or movies, you've probably come across some depiction of dissociative identity disorder (DID), or perhaps heard of the diagnosis by its old name, "multiple personality disorder."

But while media representation of DID may lead you to think of people with "multiple personalities" as unstable and potentially violent, with distinct personas that they shift between, the truth is, much of that is exaggerated or just plain false.

In reality, DID is a very real disorder and public misunderstanding can be stigmatizing and harmful to the people who live with it. Insider spoke with mental health experts to debunk some common myths and misperceptions about DID.

Valarie L. Harris, a mental health clinician in Clarksville, Tennessee, told Insider this is one of the most common falsehoods about DID. It's also not exceedingly rare - DID may affect up to 1.5% of the population.

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