Cystic fibrosis is a serious disorder that can cause severe damage to the lungs and digestive system. Cystic fibrosis affects the cells that produce mucus, sweat and digestive juices. It is one of the most common chronic lung diseases in children and young adults.
Cystic fibrosis (CF) is caused by a defective gene which causes the body to produce abnormally thick and sticky fluid, called mucus.