Chemical pneumonitis
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Chemical pneumonitis


Chemical pneumonitis is inflammation of the lungs or breathing difficulty caused by inhaling chemical fumes.


Many household and industrial chemicals are capable of producing both an acute and a chronic form of inflammation in the lung. Acute chemical pneumonitis causes swelling of the lung tissue, movement of fluid into the air spaces in the lung, and less ability to absorb oxygen and get rid of carbon dioxide. In severe cases, death may result from lack of oxygen reaching the tissues (hypoxia).

Chlorine gas is one of the most irritating commonly inhaled substance. Exposure to dangerous levels of chlorine gas may occur at home (during use of cleaning materials such as chlorine bleach), in industrial accidents, or near swimming pools. Inhalation of dangerous substances can occur in many different settings, including factories (especially during smelting, welding, or other metal work), the production or use of solvents or pesticides, fires (house fires, wildfires), and the handling of grain.

Chronic chemical pneumonitis can follow low levels of exposure to the lung irritant over extended periods of time. This causes inflammation and may provoke fibrosis (scarring) with decreased oxygen exchange and stiffening of the lung. Unchecked, this condition may ultimately lead to respiratory failure and death.



  • Unusual sensation (possibly burning feeling) in the chest
  • Difficulty breathing
  • Air hunger (feeling that you cannot get enough air)
  • Cough
  • Possibly wet or gurgle sounding breathing (abnormal lung sounds)
  • Shortness of breath with only mild exercise
  • Rapid breathing (tachypnea)
  • Cough may or may not occur
  • Progressive disability (related to shortness of breath)

Exams and Tests

The following tests help determine how severely the lungs are affected:

  • X-ray of the chest
  • Blood gas
  • Lung function studies
  • CT scan of chest


Treatment is focused on reducing symptoms. Oxygen therapy may be helpful. Corticosteroids may be given to reduce inflammation.

Outlook (Prognosis)

The outcome depends on the chemical agent involved, the severity of exposure, and whether the problem is acute or chronic.

Possible Complications

Respiratory failure and death can occur.

When to Contact a Medical Professional

Call your health care provider if you have trouble breathing after inhaling (or possibly inhaling) any substance.


Household chemicals should be used only as directed and always in well-ventilated areas. Work rules regarding breathing masks should be followed and the appropriate breathing mask should be worn. Persons who work near fires should take care to limit exposure to smoke or gases.

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