Why negative symptoms even exist? What is science behind it?

So ca anyone explain? When i got first ill i did not know of them

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I think that’s a little like asking why positive symptoms exist. It’s all connected. And no one knows exactly what causes schizophrenia so an exact explanation is not likely to be had. It’s probably a combination of genetics and external factors. Add in your dopamine receptors being blocked by meds on top of natural sz negatives and you’ve got booku negatives.