Oh no! I wish her a safe surgery and full recovery whenever she has her surgery!
I hope she takes this as a blessing in disguise though. She has been working way too hard and touring like crazy, this is her body's way (a sad way) of telling her to cool it down and take a break.
I hope she takes this break to rest, focus on the finishing details of Artpop, and then come back swinging at the end of this year!