Why Would I Have A Swollen Arm After Tummy Tuck and Lipo?

You haven't indicated whether the arm that is swollen had the intravenous in place for many hours. Being on an operating table isn't the most comfortable position, even though you were asleep for the procedure! It's possible that this could be aching and pain combined with surgical positioning but it could indicate a potential embolism as well. I agree with Dr Pousti that you need to be seen by your plastic surgeon as soon as possible.

A Tummy Tuck and Liposuction is not a short procedure. During the procedure you receive a lot of IV fluids AND your arms are held elevated to your sides to allow the surgeon access to your body. Several factors can cause swelling; from the amount of fluid given, to the padding of or the constriction around the arms and even the angle the arms were held. In the vast majority of cases this resolves in a few days. I would see your Plastic surgeon to make sure there is nothing to worry about.

Thank you for the question.

Given that you have an  asymmetrically “really swollen' upper  extremity,  you should be evaluated by your plastic surgeon immediately.  There are a variety of causes of the situation,  some "benign" but some potentially dangerous. Treatment will depend on diagnosis.

Best wishes.