Cystic Fibrosis Say: SIS-tik fi-BRO-sus You may know that you have mucus in your nose, mouth, and lungs, and that it helps keep you healthy. But kids with the condition cystic fibrosis have bodies that make thick, sticky mucus. This causes problems in their lungs and their digestive tract. The condition makes it hard for them to breathe and also to get the nutrition they need from their food. Back to Articles Related Articles Your Lungs & Respiratory System What's something kids are doing all day, every day? Breathing! Your lungs are large and in charge of breathing, so read all about them in this article. Read More Cystic Fibrosis Cystic fibrosis affects the lungs and makes it hard to breathe. Find out more in this article for kids. Read More 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.