Swelling in foot and ankle no pain. Stand on my feet a majority of the day. What could it be? Thanks

Swelling. Without an exam it is difficult to speak definitively, but if there are vericose veins present this can contribute to non painful swelling . Also , joint fluid can leak from small tears or weakness in the joint capsule. There are many possibilities here and an exam and xrays/tests are in order. See a podiatrist - good luck !
See below. It could be bad valves in the blood vessels causing pooling of blood and swelling. Try wearing a compression stocking.

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