extrinsic asthma definition
Extrinsic asthma: Introduction. Extrinsic asthma: Extrinsic asthma is a type of asthma that is triggered by an exposure to an allergen. Extrinsic asthma involves constriction and inflammation of the airways in response to exposure to the allergen. Examples of possible allergens include dust mites, pollen and mould. The severity of symptoms and allergen involved is variable.