cystic fibrosis

Key facts Cystic fibrosis (CF) is a disease that mostly affects your lungs and digestive system. CF is caused by a mutation (change) in a gene which is inherited (passed on) from your parents. Currently, there is no cure for CF. What is cystic fibrosis? Cystic fibrosis (CF) is a genetic disease that mostly affects your lungs and digestive system. It results from a change in a particular gene. CF causes you to get a lot of very thick and sticky mucus in your: lungs airways digestive system This causes problems with: digesting your food repeated lung infections, which can permanently damage your