Why Your Ankle Hurts
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Sprained Ankle
It’s a tear in the tissues (called ligaments) that hold your ankle bones together. It often happens when your foot rolls sideways. Your ankle may bruise and swell. You might not be able to put weight on it. RICE is the best way to treat it:
Rest
Ice for 20 minutes at a time
Compress with an elastic bandage
Elevate your ankle -- lift it above your heart
A light sprain will get better in a few days. If yours is worse, the doctor may suggest a short cast or walking boot, followed by physical therapy.
https://www.webmd.com/pain-management/ss/slideshow-ankle-problems-pain