Your ankle has two fluid-filled sacs, or bursa, that cushion the space between the tendons and bones. They can get inflamed from arthritis, overuse, high-heeled shoes, recent footwear changes, or starting workouts again after time off. Your ankle may feel stiff, tender, warm, and swollen. The best treatment is RICE: rest, ice, compression and elevation. Take anti-inflammatory drugs to ease the pain and swelling. Stretches and special exercises can prevent future problems.