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This article is from the Asthma FAQ, by Patricia Wrean and Marie Goldenberg mwg@radix.net with numerous contributions by others.

1.4.1 What is intrinsic/extrinsic asthma?

Intrinsic and extrinsic asthma are outdated terms which have now
been replaced by terms related to the asthma trigger, since the
inflammatory response of the airways is the same independent of
the cause of the asthma. What was known as extrinsic asthma is
now called allergic asthma, while asthma triggered by non-allergic
factors, formerly called intrinsic asthma, is separated into such
categories as exercise-induced asthma and occupational (chemical-
induced) asthma.

 

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