Other complications

Osteoporosis. People with cystic fibrosis are at higher risk of developing osteoporosis, a dangerous thinning of bones. This may be linked to the body's inability to absorb vitamin D, which helps build strong bones.
Electrolyte imbalances. Because people with cystic fibrosis have saltier sweat, this can upset the balance of minerals in their blood. Symptoms include increased heart rate, fatigue, weakness and low blood pressure.