There are a variety of reasons for swollen ankles and feet including high blood pressure, cardiovascular problems, circulation problem, kidney problem and something putting pressure on a major vein (the Inferior vena cava)
Transient swelling could be related to prolonged immobility causing calf muscles failing to pump fluid back into the circulation. Other causes include varicose veins, side-effects of some drugs and being overweight.
A mild diuretic would be the first action, together with compression hosiery.
Keep your legs elevated at a high angle when you can to encourage drainage and if you have a sedentary job ensure that you get up and move around every hour.
Avoid caffeine drinks, but do continue to drink water. Reduce your salt intake too.
I've tried to look at the effect on epidural and water retention. Steroid epidural injections have some sort of relationship with water retention, but tend to cause water retention, not relieve it. I cannot say more without knowing what was in the epidural. A simple explanation may be that with the decrease in pain, you are able to move about more therefore reducing statis in the lower limbs.
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