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Occupational Asthma

Occupational Asthma Overview

Asthma is a chronic (long-term, ongoing) inflammation of the breathing passages (bronchi) of the lungs. The inflammation irritates the airway, causing breathing problems.

  • Most people with asthma have sudden attacks or periods of bothersome or severe symptoms separated by periods of mild symptoms or no symptoms at all.

  • Asthma is an inflammatory reaction that is triggered by external factors or specific situations.

  • When a person with asthma is exposed to one of his or her triggers, the inflammation worsens and symptoms ensue.  
Occupational asthma is a breathing (respiratory) disease caused by exposure to a trigger in the workplace. The list of known triggers is long and varied.
  • The trigger generally is something inhaled.

  • Occupational asthma can occur in almost any line of work or any work environment, including offices, stores, hospitals, and medical facilities.

  • Triggers include contaminants in the air, such as smoke, chemicals, vapors (gases), fumes, dust, or other particles; respiratory infections, such as colds and flu (viruses); allergens in the air, such as molds, animal dander, and pollen; extremes of temperature or humidity; and emotional excitement or stress.
Two types of occupational asthma attacks occur.
  • Aggravation of preexisting asthma: This is by far the most common type. Over time, with regular exposure, you develop hypersensitivity to the trigger. With this underlying asthma, continued exposure to the trigger causes attacks.

  • Irritant asthma: Exposure to certain substances or conditions in the workplace irritates the airways, with immediate symptoms. Although this is not an allergic-type reaction, the irritation may cause allergylike or asthmalike symptoms.
Once the attack is triggered, the airways begin to swell and tighten (bronchospasm) and secrete large amounts of mucus. Unlike other types of COPD, asthma is reversible. It cannot be cured, but it can be controlled by medication.
  • You have a better chance of controlling your asthma if it is diagnosed early and treatment begun right away.

  • With proper treatment, you can have fewer and less severe attacks.

  • Without treatment, you will have more frequent and more severe attacks. You can even die from a severe asthma attack.
Early recognition and avoidance of the trigger is particularly important in occupational asthma.
  • Because people spend so much time at work, they tend to have extensive exposure to their trigger by the time the cause of the symptoms is recognized as asthma.

  • The more time you spend exposed to your trigger, the more likely you are to have permanent lung inflammation and airway hypersensitivity.
Occupational asthma is the most common work-related lung disease in developed countries. In up to 15% of people with asthma in the United States, the condition is at least partly related to their work.



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Occupational Asthma

What Is Asthma?

Asthma is a disease that causes inflammation and narrowing of the breathing passages of the lungs (bronchi and bronchioles).

What Causes Asthma?

Asthma is caused by chronic (ongoing, long-term) inflammation of these airways passages. Individuals with asthma are highly sensitive to various "triggers" that lead to inflammation of the airways. When the inflammation is triggered by one or more of these factors, the air passages swell and fill with mucus. The muscles within the breathing passages contract and narrow (bronchospasm). The narrow airways make it hard to exhale (breathe out from the lungs).

What Are the Risks of Asthma?

Asthma causes wheezing, breathing difficulties, chest pain or tightness, and spasmodic coughing that often worsens at night. Asthma may impair individuals' ability to exercise, to engage in outdoor activities, to have pets, or to tolerate environments with s...

Read the Asthma Medications article »



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