Easing Pain and Swelling. 1  1. Elevate the wrist. 2  2. Apply ice to your wrist. 3  3. Take an over-the-counter painkiller.  4. Wiggle your fingers and move your elbow 1  around. 5. Avoid sticking objects into the cast.  6. Apply moleskin to prevent 1  rubbing. 7. Know when to call your doctor.