Cystic fibrosis is a hereditary disease that affects the lungs and digestive system. The body produces thick and sticky mucus that can clog the lungs and obstruct the pancreas. Cystic fibrosis (CF) can be life-threatening, and people with the condition tend to have a shorter-than-normal life span.An inherited life-threatening disorder that damages the lungs and digestive system.Cystic fibrosis affects the cells that produce mucus, sweat and digestive juices. It causes these fluids to become thick and sticky. They then plug up tubes, ducts and passageways.Symtoms vary and can include cough, repeated lung infections, inability to gain weight and fatty stools.Treatments may ease symptoms and reduce complications. Newborn screening helps with early diagnosis.