There are many possible causes of swollen feet (pedal edema). Some other causes (besides a sprained ankle) are congestive heart failure when your heart’s pumping ability cannot keep up with the blood being returned to it so that blood "backs up" in the veins and causes lower extremity edema (swollen feet). This is why I asked if you were taking your Lasix. Malnutrition or kidney failure can cause low protein in the blood with fluid leaking from the blood vessels which can cause swelling. Symptoms of CHF are trouble breathing or lying flat because you feel short of breath, fatigue, weight gain from excess fluid, chest pain, anorexia with a feeling similar to indigestion, swollen distended neck veins, skin is cold and sweaty, and a fast or irregular pulse.
Since you didn't mention symptoms of CHF, malnutrition, or kidney failure, then I ruled-out these causes of your swollen right foot.
Diabetics get what is called a "Charcot's foot". Charcot's foot is a complication of diabetes that occurs with neuropathy (nerve damage). The bones in the foot become weakened and fracture easily, even without any major trauma. The pain goes unnoticed and the patient continues to walk on the swollen fractured or sprained foot. Painless swelling is the hallmark of a Charcot's foot:
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Since you are not diabetic, don't have a sprained ankle, you aren't malnourished, are taking your Lasix to prevent CHF and you don't have kidney failure, then I think that you may have venous stasis. This is due to poor circulation caused by aging veins that impede blood return to the heart. Sometimes you can see the veins more prominently on your feet and they appear more full of blood but the blood isn't moving.
It’s important to keep active and to keep the swelling down by keeping your feet elevated when stationary and wear support hose.
I recommend that if the swelling in your foot isn't relieved with elevation and ice, then you should be examined by your primary care physician in person who will perform a doppler test to check the circulation in your extremities.
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