Abstract
Asthma can be defined as paroxysmal generalised airways obstruction which varies in severity either spontaneously or as a result of treatment. It is a disease characterised by an increased responsiveness of the bronchi such that a wide variety of stimuli cause narrowing of the airways when delivered to the tracheobronchial tree of an asthmatic patient. Such stimuli cause either no narrowing, or very much less narrowing of the bronchi in the nonasthmatic individual. Thus in asthma the bronchi are hypersensitive and can be 'triggered' to narrow by ope or more different stimuli. A knowledge of the various stimuli, or precipitants, of asthmatic attacks is important, as attention to these precipitants is an integral part of the management of any asthmatic patient.
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