Cystic Fibrosis
What Is CF? Cystic fibrosis (say: SIS-tik fi-BRO-sus), or CF, is a disease that causes the body to make thick, sticky mucus (say: MYOO-kus). This causes problems in two major areas: the lungs and the digestive system. What Happens in CF? Healthy lungs make mucus, which protects the airways and makes it easier to breathe. To make normal mucus, …