Cast Say: kast If you ever break a bone, you'll probably need a cast to hold the pieces of bone steady while they're healing. Casts wrap around the broken area and can be made out of plaster, fiberglass, or even plastic and air (called an air cast). When you get a cast, you need to keep it away from water the entire time it's on. Even though a cast may look and feel a little clumsy, it lets your broken bone grow back together again, and that's pretty important! After you're better, the doctor will take the cast off, which doesn't hurt at all. Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.