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1 Cystic fibrosis primarily affects the lungs and digestive system. 2  It leads to the production of mucus that is much thicker and more sticky than usual. 3  Cystic fibrosis is a hereditary condition, caused by a defective gene. 4  The cystic fibrosis gene must be present in both parents for a child to have the condition.
The life expectancy for people with cystic fibrosis has been steadily increasing. What causes cystic fibrosis? Cystic fibrosis is one of the most common genetic disorders in white children in the United States and Canada. It's caused by a change, or mutation, in a gene. The changed gene is passed down in families.