This could be anything from normal shivering to a reaction to medications. The best thing to do is to discuss this with your surgeon. Every situation is unique, and without being involved no one can tell you what happened. Best of luck to you.
These answers are for educational purposes and should not be relied upon as
a substitute for medical advice you may receive from your physician. If you
have a medical emergency, please call 911. These answers do not constitute
or initiate a patient/doctor relationship.