why can't some people talk?

Question: and i'm not asking about people that can't speak english or anything, i'm asking about like mute people. the people that understand their language but just aren't capable of speaking. because my mother's friend came over, and the friend's sister can't speak. i felt really sorry for her when i heard.
thanks a lot for your help!

Answers:
Voice box complications?

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She may have been born with a physical deformity of her vocal cords or maybe she had an injury...see website below for more details

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