I'm taking a few days off work to take my mom to hospital for an operation, what should I say to coworkers who ask about it?

Because it's something embarrassing that I know she wont want me to talk to people about and I sure as hell do not want to talk about it hell I wish she'd never told me about it! My mom she's got so many problems omfg but yes I know people at work are going to ask about it but what should I say?
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