Why are my ankles swollen like balloons? all blood work came back normal, including heart, kidney, urine, liver, tsh. this is a sudden problem for me?

Other causes?: Other causes of ankle swelling are arthritis/inflammation, varicose veins, salt/fluid imbalance. Sounds like all the "bad" things have been ruled out which is reassuring.

Various Causes: Swelling of both ankles may be caused by imbalances of salt or protein in relation to water in your blood. This may be nutrionally-related (low protein or high salt) if your basic lab testing was normal. They may not have checked nutritional markers such as albumin. You may benefit from an assessment of your heart function with a non-invasive ultrasound of your heart, known as a echocardiogram.