A member asked:

For what reasons might the ankle swell up so much after you sprain it?

A doctor has provided 1 answer

Trauma: To any area of the body causes welling. The ankle is a joint with fluid in it and some of that contributes to the swelling and the reason it lasts a while is gravity lowest part of the body and the distance from the heart which pumps all the fluid.

Answered 5/21/2013

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