It may be difficult to tell the difference between some symptoms of cystic fibrosis and symptoms that are caused by other conditions.

• Breathing problems that are related to cystic fibrosis can be similar to those that are caused by other lung conditions, such as:
  • Asthma.
  • Pneumonia.
  • Bronchitis.
  • Primary ciliary dyskinesia.
• Frequent infections may occur with cystic fibrosis. Repeated infections also may develop from conditions that cause an impaired immune system, such as HIV infection.
• Problems with digestion and the absorption of nutrients may be confused with celiac disease or other conditions that affect the digestive system.