Chemical Pneumonitis: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Chemical Pneumonitis?
A pulmonologist (a lung doctor) treats chemical pneumonitis. An emergency medicine doctor often treats it first after a big exposure. Your primary care doctor can check your breathing. They can refer you to a lung doctor if symptoms last. 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 chemical pneumonitis?
Chemical pneumonitis is inflammation (swelling) of the lungs. It can also cause trouble breathing. It starts after you inhale chemical fumes or choke on certain chemicals. Pneumonitis means lung inflammation. Breathing in stomach acid can also cause it.
There are two types. Acute pneumonitis occurs rapidly after breathing in the substance. Long-term (chronic) pneumonitis occurs after exposure to low levels of the substance over a long time. This causes inflammation and may lead to stiffness of the lungs. As a result, the lungs start to lose their ability to get oxygen to the body.
Symptoms
Acute symptoms may include:
- Air hunger, a feeling that you cannot get enough air.
- Breathing that sounds wet or gurgling.
- Cough.
- Difficulty breathing.
- A strange or burning feeling in the chest.
Long-term symptoms may include a cough that may or may not occur. Breathing may become rapid. Shortness of breath may come with only mild exercise. Over time, shortness of breath can cause disability.
Causes and who gets it
Many chemicals used in the home and workplace can cause pneumonitis. Common dangerous inhaled substances include:
- Chlorine gas from cleaning materials such as chlorine bleach.
- Grain and fertilizer dust.
- Fumes from pesticides.
- Smoke from house fires and wildfires.
Breathing in stomach acid over a long time can also lead to chemical pneumonitis. So can exposure to chemical weapons.
Aspiration means breathing material into the lungs instead of swallowing it. Risk factors include:
- Being less alert due to medicines, illness, or surgery.
- Problems with swallowing.
- Receiving medicine to put you into a deep sleep for surgery (general anesthesia).
- Old age.
- Eating or being fed when not upright.
How doctors diagnose it
Your doctor will use a stethoscope (a listening tool) to listen for crackles. Crackles are abnormal breath sounds. Tests that show how severely the lungs are affected include:
- A chest x-ray and a CT scan of the chest.
- Blood gases. This test measures how much oxygen and carbon dioxide are in your blood.
- Lung (pulmonary) function studies. These tests measure how well the lungs work.
- Swallowing studies to check if stomach acid is the cause.
Treatment
If you breathe in chlorine or other fumes, get away from the area and breathe fresh air. Poison Control can advise you at 1-800-222-1222. Treatment is focused on reversing the cause of inflammation. It also reduces symptoms. Corticosteroids are medicines that calm inflammation. They may be given to reduce inflammation, often before long-term scarring occurs. Antibiotics are usually not helpful or needed, unless there is also a second infection. Oxygen therapy may be helpful.
If swallowing and stomach problems are the cause, small meals can help. Eat them while sitting upright. In severe cases, a feeding tube in the stomach is needed. It does not always completely prevent aspiration into the lungs. Some people may need to be hospitalized. Sometimes a ventilator (breathing machine) is needed to support breathing.
When to see a doctor
Go to the emergency room or call 911 if you have trouble breathing after inhaling, or possibly inhaling, any substance. Do the same if you have chest pain, chills, fever, shortness of breath, wheezing, or bluish discoloration of the lips or tongue.
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. Your doctor can check your breathing, order a chest x-ray if needed, and arrange lung tests or a referral to a pulmonologist. Follow-up visits can track your long-term symptoms.
Common questions
Is chemical pneumonitis the same as pneumonia?
No. Pneumonia is an infection of the lungs or large airways. It causes inflammation (swelling). Chemical pneumonitis is inflammation of the lungs from a chemical. Antibiotics are usually not helpful or needed unless there is also a second infection.
Which chemicals can cause it?
Common ones are chlorine gas from bleach, grain and fertilizer dust, fumes from pesticides, and smoke from house fires and wildfires. Breathing in stomach acid over time can also cause it.
Can it scar the lungs?
It may. The long-term form may lead to stiffness of the lungs. As a result, the lungs start to lose their ability to get oxygen to the body. Untreated, this condition can cause respiratory failure (when the lungs can no longer get enough oxygen into the blood) and death. The outlook depends on the chemical and how severe the exposure was.
What tests will I need?
Tests may include a chest x-ray, a CT scan of the chest, blood gases, lung function studies, and swallowing studies to check if stomach acid is the cause. Blood tests of kidney and liver function may also be done.
Sources
- MedlinePlus - Chemical pneumonitis
- MedlinePlus - Aspiration pneumonia
- CDC - Chlorine: What to Do If You Are Exposed
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.
