Occupational asthma is a type of asthma that is triggered if one is exposed to irritants found in the workplace. The workplace may contain many irritants, like dust, gases and fumes of chemicals. If a person with occupational asthma breathes into these irritants, it causes worsening of asthma symptoms such as coughing, wheezing, chest tightness and difficulty catching breath. Other symptoms, such as runny nose, congestion of the nasal passages and irritation of the eyes, are also common.

In general, people who already have asthma and/or allergies are most likely to develop occupational asthma. However, the risk is highest for those in the following occupations:

1. Adhesive handlers: They have to breathe in fumes from chemicals like acrylate, which is a known lung irritant.

2. Animal handlers and veterinarians: They work with animal proteins which trigger asthma. Proteins are found in different animal substances, such as hair scales, fur, saliva, dander and body wastes.

3. Bakers and millers: They inhale cereal grains. When inhaled, these substances may inflame the walls of the bronchial tubes of the lungs.

4. Carpet makers: They work with gums, another lung irritant.

5. Electronics workers: They work with electronics solders which contain resin. The resin, if inhaled, triggers asthma.

6. Forest workers, carpenters and cabinet makers: They have to inhale dust from wood. Dust is a very common allergen.