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Cystic fibrosis is a hereditary disease that affects the entire body, causing progressive disability and early death. Cystic fibrosis affects the entire body and impacts growth, breathing, digestion, and reproduction. Difficulty breathing and insufficient enzyme production in the pancreas are the most common symptoms. The Pancreas of patients with Cystic Fibrosis fails to produce enough enzymes that are necessary to break down food. As a result the food eaten retains its fats and most of its nutrients as it passes through the body. The bronchial tubes in the lungs also malfunction and produce a thick, sticky mucus. Germs multiply in this mucus and cause respiratory infection such as pneumonia, accompanied by a cough and high fever that is more severe than normal. A multitude of other symptoms, including sinus infections, poor growth, diarrhea, and potential infertility (mostly in males) result from the effects of cystic fibrosis on other parts of the body. viagra class action usage of viagra for the heart generic option to viagra usa viagra