(from the article `respiratory disease`) ...asthma is precipitated by contact with any of the substances to which sensitization has occurred; airway obstruction is often worse in the early ...
<chest medicine> Bronchial asthma in which no extrinsic causes can be identified, and which is assumed to be due to an endogenous process, possibly allergic. ... (05 Mar 2000) ... 
asthma due to pathologic or physiologic factors in the individual rather than environmental conditions; the usual cause is a chronic or recurrent infection of the bronchi, sinuses, or tonsils and adenoids, sometimes from hypersensitivity to the viruses or bacteria causing the infection.
Type: Term Definitions: 1. bronchial asthma in which no extrinsic causes can be identified, and which is assumed to be due to an endogenous process.
Intrinsic asthma is asthma that has no apparent external cause.
asthma that has no apparent external cause.