Respiratory failure
Cystic fibrosis affects the lungs badly and damages lung tissues to a level that the lungs stop working. The functions of the lungs worsen gradually due to the continual blockage of bronchial tubes. If not taken care of properly, the mucus can fill up the lungs, making it extremely difficult to breathe. It can be life-threatening and can result in respiratory failure, which is the most common cause of death. In this case, the need to replace the lungs becomes mandatory to save a life.