Infertility in men: Almost all men with cystic fibrosis are infertile because the tube that connects the testes and prostate gland (vas deferens) is either blocked with mucus or missing entirely.
Reduced fertility in women: Although women with cystic fibrosis may be less fertile than other women, it's possible for them to conceive and to have successful pregnancies. Still, pregnancy can worsen the signs and symptoms of CF, so be sure to discuss the possible risks with your doctor.
Other complications:
Thinning of the bones (osteoporosis): People with cystic fibrosis are at higher risk of developing a dangerous thinning of bones. They may also experience joint pain, arthritis and muscle pain.
Electrolyte imbalances and dehydration: Because people with cystic fibrosis have saltier sweat, the balance of minerals in their blood may be upset. This makes them prone to dehydration, especially with exercise or in hot weather. Signs and symptoms include increased heart rate, fatigue, weakness and low blood pressure.
Mental health problems: Dealing with a chronic illness that has no cure may cause fear, depression and anxiety.
Courtesy: Mayo Clinic