Cystic Fibrosis is caused by a defect in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Gene. The child inherits this defect from his parents but the symptoms may not appear for a long time.

The water and sodium moving in and out of the human body produce mucus which becomes too thick because of the faulty gene. This thick mucus clogs the internal organs of the body including the reproductive system, digestive system bacterial infections, airway obstruction and bodily tissue. child needs to inherit two genes from the parents to be affected with this problem. If only one parent is affected with the disease, the chances are that the child will be a carrier of the disease. A carrier is a healthy person and exhibits no symptoms of a disorder. If two persons with affected gene conceive a child, there are 25 percent chances of that child being affected with the disease. There are 50 percent chances of that child having one defective copy of the gene and only 25 percent chances of their child not being affected by this defect in the genes. At present there is no cure for Cystic fibrosis but researchers are trying to find a cure for this disease or a way to replace the defective gene. Till then, some medicines combined with exercises and chest therapy help the patients live a normal life.