When a person's appendix gets inflamed (swells up), it's called appendicitis. Sometimes this happens after there is an infection in the intestine. Other times, something causes a blockage in the appendix. And sometimes there isn't a clear reason why it happens. If someone has appendicitis, the appendix will need to be taken out during an operation called an appendectomy.
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2017 KidsHealth ® All rights reserved. Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com