What surgery should I tell my coworkers I’m having?

I’m scheduled for surgery 7 weeks from now. I’m putting my request for leave in today, so I will start getting questions soon.

I don’t want anyone knowing what I’m having done, so what’s a good cover story? Gallbladder surgery? Something else?

I’m looking for something that has similiar timeframes of recovery, that I would also know about 7+ weeks ahead of time. A lot of surgeries I think of are more last minute surgeries I would not be aware of 7 weeks out.

Thank you