What is the syndrome called when you cannot feel physical pain?

I remember watching a show a long time ago, and this one little girl was born with a syndrome where she could never feel pain. If she fell on the floor and cut her knee, she wouldn't cry, whereas most children would.

What is this called? Is it a syndrome? Is it a medical condition? I just want to know what it's called, and I can do the research on it.

It is for a story I am writing but I don't entirely know what it is.

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