Do people with schizophrenia really see demons or hear voices?

I've seen a lot of documentaries recently that someone suffering from schizophrenia says he sees people, hear voices that tells them to do awful things...

How Is this really possible? I'm not trying to be rude or say they're lying (understand me)

I'm just saying... this must be the scariest thing on earth
Do people with schizophrenia really see demons or hear voices?
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