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7. Cystic Fibrosis

Cystic fibrosis (CF) is a genetic condition that causes a faulty protein in the body, which affects how the body makes mucus and sweat. Mucus protects the lining of the lungs and the GI tract. It is usually slippery, but in people with CF, it's thick and sticky, which can cause blockages and damage to the lungs and other organs.

CF varies in severity; some people have few symptoms, while others experience life-threatening complications. There is no cure for CF, but research into treatments is ongoing.

Little boy makes inhalation at home filadendron / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.