External or a cause coming from outside. In this type of asthma, the cause of an attack is normally the inhalation of an allergen. Extrinsic asthma is more likely than intrinsic to start in childhood, and often the trigger(s) can be identified and dealt with. In extrinsic asthma, the reaction of the airways is like an allergic reaction, and is similar to hayfever and other allergies.
A classification of asthma that means about the same thing as "allergy-related". Extrinsic asthma has symptoms triggered by exposure to an allergen. (This term is not used much any more.)
not forming an essential part of a thing or arising or originating from the outside; "extrinsic evidence"; "an extrinsic feature of the new building"; "that style is something extrinsic to the subject"; "looking for extrinsic aid"
external aging that is by the environment and occurs as a result of exposure to the sun, air pollution, smoking, lifestyle, cosmetics, allergens, and personal negligence.