If your lower extremities are swelling, it can be for a number of reasons, including pregnancy, obesity, and aging. Consuming too much salt or standing in one place for a long time may also cause your ankles and feet to swell. If the problem doesn't subside over time, you may have poor circulation. The lack of blood flow makes the kidneys function improperly, and the fluids in the blood capillary absorb into the surrounding tissues, causing swelling.
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