Bronchiolitis Obliterans: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Bronchiolitis Obliterans?
A pulmonologist treats it. A pulmonologist is a doctor who specializes in lung diseases. People who had a lung transplant may also see a transplant team. 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 bronchiolitis obliterans?
Bronchiolitis obliterans is a rare lung disease. It is also called constrictive bronchiolitis or, by its nickname, popcorn lung. It damages the bronchioles, the tiniest airways in the lungs. Scarring builds up in these small airways and narrows them. That makes it hard for air to flow in and out. The scarring does not go away. The condition is long lasting, but treatments can slow it down and ease symptoms.
Symptoms
Some people with bronchiolitis obliterans have no symptoms at first. When symptoms appear, the most common ones are:
- Shortness of breath, especially during exercise or hard work.
- A dry cough.
- Wheezing, a whistling sound when breathing.
- Fatigue, or feeling very tired.
Symptoms usually develop over a few weeks or months. They slowly get worse over time as the airways narrow more.
Causes and who gets it
Many different things can injure the small airways and lead to this disease:
- Breathing in harmful fumes, gases, or chemicals, such as flavors used in food production or other workplace toxins.
- A lung transplant or a stem cell transplant. The immune system may slowly attack the transplanted tissue.
- A past viral lung infection, such as adenovirus or RSV (a common winter virus), especially in children.
- Autoimmune diseases, where the immune system attacks the body's own tissue. Rheumatoid arthritis is one example. It is a joint disease that can also affect the lungs.
How doctors diagnose it
The doctor starts with your history, an exam, and questions about any exposure to fumes or chemicals. The main test is spirometry, a lung function test that measures how much air you can breathe in and out. In this disease, the airflow does not improve after a bronchodilator. This is a medicine that opens the airways. A chest X-ray or a CT scan may also be done. If the diagnosis is still unclear, the doctor may take a lung biopsy, a small tissue sample checked in a lab.
Treatment
There is no cure, but treatment can slow the disease and ease symptoms. The most common treatment is a corticosteroid. This is a strong anti-inflammatory medicine that calms the immune system. Bronchodilator medicines relax the muscles around the airways so they open up. If blood oxygen runs low, extra oxygen can be given through a small tube. Avoiding any chemical or fume that caused the disease is very important. When the disease becomes severe and no longer responds to other treatments, a lung transplant may be an option.
When to see a doctor
See a doctor if you have a cough or shortness of breath that lasts more than a few weeks. This is extra urgent if you worked around fumes or chemicals or had a lung transplant. Call 911 or go to the emergency room for severe trouble breathing, because the condition can become life threatening and lung infections can become severe.
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. Either can order first tests, watch your breathing over time, and coordinate care with a lung specialist. They can also help you keep up with vaccines and follow-up visits that protect your lungs.
Common questions
Is bronchiolitis obliterans the same as popcorn lung?
Yes, popcorn lung is the nickname for bronchiolitis obliterans. The name came from workers who got sick after breathing a chemical used to flavor popcorn. The disease itself is rare and serious.
Can bronchiolitis obliterans be cured?
No, the scarring in the small airways does not go away. Treatment can slow the disease and make breathing easier, which is why doctors want to catch it early.
Who is most at risk?
Some people breathe in toxic fumes at work. Some had a lung or stem cell transplant. Some had a severe viral lung infection. Some have autoimmune diseases. These things raise the risk.
Can it be prevented?
You can lower the risk by following safety rules around fumes and chemicals, not smoking or vaping, and avoiding secondhand smoke. Causes linked to transplants and some infections cannot be prevented.
Sources
- American Lung Association - Bronchiolitis Obliterans Symptoms and Diagnosis
- American Lung Association - Treating and Managing Bronchiolitis Obliterans
- StatPearls - NCBI Bookshelf - Bronchiolitis Obliterans
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.
