Ankle sprains involve injury to one or more of the stabilizing ligaments located around and just below the bony knobs on either side of the ankle. Most of the time the injury involves twisting the ankle inward, resulting in a lateral (outer) ankle sprain. Less commonly, the ankle is twisted outward, which damages the medial (inner) ankle ligaments. Pain and swelling occur, and depending on the severity you may not be able to put weight on the ankle or walk normally.
Initial Care: Apply the RICES Method
Rest Avoid painful activities
Ice Apply for 20 minutes; remove for 1-2 hours, and reapply.
Compression Wrap the ice on with an elastic bandage. Wear the elastic bandage when not icing. Wrap it on snug but not real tight.
Elevation Keep the injured ankle above heart level.
See your athletic trainer or doctor for injury evaluation.