what is a cystic
Cystic fibrosis (SIS-tik fi-BRO-sis), or CF, is an inherited disease of the secretory (see-KREH-tor-ee) glands. Secretory glands include glands that make mucus and sweat. Inherited means the disease is passed from parents to children through genes. People who have CF inherit two faulty genes for the diseaseâone from each parent.