Cystic Fibrosis: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Cystic Fibrosis?
A pulmonologist, a lung doctor, often helps lead care for cystic fibrosis (CF). Your care team will likely include a CF specialist, a doctor who knows this complex condition. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is cystic fibrosis?
Cystic fibrosis (CF) is an inherited disease. It is passed down through families. It causes thick, sticky mucus to build up in the lungs, the digestive system, and other parts of the body.
The mucus builds up in the breathing passages of the lungs and in the pancreas. This can cause serious lung infections and digestion problems. CF may also affect the sweat glands and the male reproductive system.
Most children with CF stay in good health until they reach adulthood.
Symptoms
Some people have few or no symptoms, while others have severe symptoms or life-threatening complications.
CF most often affects the lungs. Some people have wheezing and a cough that can produce mucus. Other symptoms depend on the organs affected and can include:
- A blocked intestine in a baby soon after birth.
- Salty skin and extra-salty sweat.
- Slow growth and shorter height.
- Delayed puberty.
- Fertility problems, especially for males.
- Severe belly pain, long-term diarrhea, or constipation.
Most children with CF are diagnosed by age 2. For a small number, the disease is not found until age 18 or older. These people often have a milder form.
Causes and who gets it
CF is passed down through families. A person must inherit two faulty genes, one from each parent, to get CF. Many people carry one CF gene and have no symptoms. CF involves a faulty protein called CFTR.
Some medicines for CF only work for certain CFTR gene mutations. People who are Asian, Black, or Hispanic are more likely to have mutations that will not respond to available CFTR modulators.
How doctors diagnose it
A blood test looks for changes in the CF gene. A sweat chloride test, which looks for a high salt level in sweat, is the standard test to diagnose CF. For newborns with a positive screening result, treatment may begin while the diagnosis is being confirmed.
If a CFTR modulator may be an option, your provider will first order genetic testing to see whether it is likely to work for you.
Treatment
There is not yet a cure for CF. Advances in treatment are helping many people live longer, healthier lives. Treatment focuses on medicines and other ways to clear the airway.
Airway clearance techniques help loosen lung mucus so it can be coughed out. Clearing mucus improves breathing and lowers the chance of infections. They include special ways to breathe and cough.
Medicines for CF include:
- Antibiotics, which prevent or treat lung infections.
- Anti-inflammatory medicines, such as ibuprofen or corticosteroids. Ibuprofen can cause kidney and stomach problems. Corticosteroids can cause bone thinning and raise blood sugar and blood pressure.
- Bronchodilators, which relax and open the airways.
- Mucus thinners, which make mucus easier to clear.
- CFTR modulators, which make faulty CFTR proteins work better. They do not work for everyone, and some may interact with other medicines, including birth control pills.
Problems with digestion and nutrition are treated too. Older children and adults may follow a diet high in protein and calories. Pancreatic enzymes help the body absorb fats and protein, and they are taken with every meal. Vitamin supplements may also be needed.
People with severe lung problems sometimes need other treatments, too. A lung transplant may help people with severe lung disease and respiratory failure.
Regular checkups are an important part of follow-up and treatment. Keep seeing your providers even if symptoms get better.
When to see a doctor
Call your doctor right away if your lung symptoms get worse, such as more coughing or wheezing, chest congestion, or a change in mucus color. Call your doctor if you cough up a small amount of blood.
Call 911 if you can no longer breathe or talk easily, feel confused, or have a bluish color on your skin or lips. Also call 911 or go to the hospital if you start coughing up a lot of blood. Call 911 for sudden, severe belly pain.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can answer questions between visits and help coordinate your care with CF specialists. Regular checkups are an important part of CF care.
Common questions
Is there a cure for cystic fibrosis?
No, there is not yet a cure for CF, but treatment helps many people live longer, healthier lives.
Can people with cystic fibrosis live into adulthood?
Yes. Most children with CF stay in good health until they reach adulthood.
Does cystic fibrosis only affect the lungs?
No. CF most often affects the lungs, but it also affects the digestive system, including the pancreas, and the sweat glands.
Who is on a cystic fibrosis care team?
A cystic fibrosis care team is likely to include a CF specialist. It may also include doctors for the lungs, diabetes, and the digestive system, along with respiratory therapists, nutritionists, and social workers.
Sources
- MedlinePlus - Cystic Fibrosis (Medical Encyclopedia)
- NHLBI (NIH) - Cystic Fibrosis Symptoms
- NHLBI (NIH) - Cystic Fibrosis Treatment
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
