Abstract
While conventional asthma is caused by mites commonly present in the environment, workers with occupational asthma that happens during their professional activities, come into contact with chemicals or biological agents that cause allergies or respiratory irritation. The Work-related asthma is a major occupational respiratory diseases in terms of prevalence. Many chemicals used in various production processes can cause or aggravate disease. The definition and classification of asthma-related work are described, as well as the epidemiological repercussions, natural history, diagnostic criteria, evolution, prognosis and its legal aspects, briefly, in order to warn about this disease and its implications for workers.