Final answer:
An illness one contracts due to chemical overexposure at work is called an occupational disease, which is distinct from other types of diseases such as pathogenic or parasitic diseases.
Step-by-step explanation:
If you get sick as a result of overexposure to chemicals at the workplace, you have contracted a(n) occupational disease. Occupational diseases are illnesses that arise from conditions related to a person's work environment. For example, hypersensitivity pneumonitis can be considered an occupational disease because it may develop from regular exposure to dust, molds, or other allergens specific to a workplace, such as a bird aviary or a cheese factory where one might develop poultry worker's lung or cheese handler's disease, respectively.
Occupational diseases are distinct from other types of diseases such as pathogenic diseases, which are caused by infectious pathogens like bacteria and viruses, or parasitic diseases, which are caused by parasites. Furthermore, an occupational disease is different from an iatrogenic disease, which is contracted as a result of medical procedures, and from nosocomial diseases, which are acquired in hospital settings.