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Injury or surgery involving the leg, ankle, or foot can also cause swelling. Swelling may also occur after pelvic surgery, especially for cancer. Long airplane flights or car rides, as well as standing for long periods of time, often lead to some swelling in the feet and ankles.
The most common cause of foot swelling is inflammation. Inflammation can be caused by two major causes (1) infection -- this often causes redness, warmth, pain as well -- which does not seem to be what you are experiencing (2) sterile inflammation.