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What is occupational asthma?
Occupational asthma is asthma that is caused by, or made worse by, something in the workplace. It can affect people in many different jobs, from cleaning and construction to healthcare and manufacturing.
It happens when the lungs become sensitive to a substance at work. This substance may be breathed in over time, or it may trigger symptoms after a single exposure.
Common workplace causes
Many different substances can lead to occupational asthma. Common examples include flour dust, wood dust, chemical fumes, paints, isocyanates, and animal proteins.
Some jobs carry a higher risk than others. These include baking, welding, spray painting, farming, hairdressing, healthcare, and laboratory work.
Symptoms to look out for
The symptoms are similar to other types of asthma. They may include wheezing, coughing, chest tightness, and shortness of breath.
One clue is that symptoms are often worse during the working week and improve when the person is away from work, such as at weekends or on holiday. Early symptoms may be mild, so they can be easy to miss.
How occupational asthma is diagnosed
If occupational asthma is suspected, a GP may ask about the person’s job, duties, and exposure to dusts, fumes, or chemicals. They may also arrange tests to check lung function.
It is helpful to keep a record of symptoms and when they happen. An occupational health specialist or respiratory clinic may also be involved in confirming the diagnosis.
Treatment and what to do next
Treatment usually includes standard asthma medicines, such as inhalers, to control symptoms and reduce inflammation. However, the most important step is to avoid or reduce exposure to the cause at work.
In some cases, a person may need to change tasks, improve ventilation, or use better protective controls. For some people, changing job or workplace may be necessary if symptoms are severe or continue to worsen.
Why early action matters
Occupational asthma can become long-term if it is not recognised early. The sooner the cause is identified, the better the chance of preventing further damage to the lungs.
Anyone who thinks their asthma may be linked to work should speak to their GP as soon as possible. They should also report concerns to their employer or occupational health team so that the workplace risks can be addressed.
Frequently Asked Questions
Occupational asthma is asthma caused by conditions or substances in the workplace, such as dusts, fumes, chemicals, or animal proteins.
Occupational asthma is triggered or worsened by exposures at work, while regular asthma may be caused by many non-work-related factors.
Common causes include flour dust, wood dust, isocyanates, latex, animal dander, cleaning agents, and certain metal or chemical fumes.
People who work with irritant or sensitizing substances, such as bakers, healthcare workers, painters, cleaners, farmers, and laboratory staff, are at higher risk.
Symptoms can include wheezing, coughing, chest tightness, and shortness of breath, often worsening during or after work.
Yes, it can develop after a single high exposure or more gradually after repeated workplace exposures over time.
Symptoms often improve on days off, weekends, or vacations, especially in the early stages.
Diagnosis usually involves a medical history, work exposure review, lung function tests, and sometimes allergy testing or peak flow monitoring at and away from work.
Finding the cause is important because continued exposure can make asthma worse and may cause long-term lung problems.
It may improve greatly if the exposure is removed early, but some people continue to have asthma even after leaving the workplace exposure.
A sensitizer is a substance that causes the immune system to react over time, leading to asthma symptoms when exposed again.
This type develops after exposure to a strong irritant, such as smoke or chemical fumes, that damages the airways and causes asthma-like symptoms.
Treatment may include asthma medicines like inhalers and avoiding or reducing exposure to the triggering substance.
Sometimes changing duties or jobs is needed if exposure cannot be controlled enough to prevent symptoms.
Masks may reduce exposure in some situations, but they do not always fully prevent occupational asthma, especially with sensitizers.
No. Occupational asthma is caused by work exposures, while work-exacerbated asthma is pre-existing asthma that becomes worse at work.
In many places, occupational asthma may be considered a work-related illness and could qualify for workers' compensation.
See a healthcare professional promptly, track when symptoms occur, and note possible workplace exposures and symptom patterns.
Occupational asthma is usually seen in adults because it is related to workplace exposures, but young workers can also develop it.
Prevention includes controlling workplace exposures, improving ventilation, using safe handling practices, substituting safer substances, and using proper protective equipment.
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