The most common symptoms of cystic fibrosis include obstruction of the bowel at birth, frequent greasy, bulky stools, or difficulty in bowel movements, very salty-tasting skin, persistent coughing, at times productive with sputum, frequent respiratory infections, wheezing or shortness of breath, poor growth and difficulty with weight gain, chronic sinusitis, sinus infections, and nasal polyps, clubbing of the fingers and toes, male infertility with an absence of sperm and malnutrition and vitamin deficiency