Occupational asthma is a lung disorder in which various substances found in the workplace lead to breathing difficulties.
Many substances in the workplace can cause occupational asthma. The most common triggers are wood dust, grain dust, animal dander, fungi, or other chemicals (especially diisocyanates).
Though the actual rate of occurrence of occupational asthma is unknown, it is suspected to cause 2 - 20% of all asthma cases in industrialized nations.
The following workers are at higher risk:
Symptoms are usually due to swelling of the airways and spasms of the muscles lining the airways. This reduces the amount of air that can pass through, and can lead to wheezing sounds.
Symptoms usually occur shortly after you are exposed to the offending substance, and often improve or go away when you leave work. Some people may not have symptoms until 12 or more hours after being exposed to the allergen.
Symptoms usually get worse toward the end of the work week and may (but not always) go away on weekends or vacations.
In general, symptoms include:
The health care provider will perform a physical exam and ask questions about your medical history. Your symptoms may have a pattern of getting worse with a specific workplace environment or substance.
The health care provider may hear wheezing when listening to the chest with a stethoscope.
The following tests may be used to diagnose this condition:
Avoiding exposure to the substance that is causing your asthma is the best treatment.
Asthma medicines (almost always inhalers) may help you manage your symptoms. Talk to your doctor about these medicines.
See: Asthma and allergy - support group
Occupational asthma may continue to get worse if you continue to be exposed to the substance that is causing the problem, even if medicines improve your symptoms.
In some instances, symptoms may continue even when the source of exposure is removed.
In general, the outcome for people with asthma is good. However, symptoms may continue for years after workplace exposure has been eliminated.
Call your health care provider if you have symptoms of asthma.
You can reduce asthma symptoms by avoiding known allergens and airway irritants.
Asthma - occupational exposure; Irritant-induced reactive airways disease