Features of disease
Prevalence at onset of disease (%)
Prevalence during course of disease (%)
Hemorrhage Glomerulonephritis Eye Skin
Mononeuritis multiplex GI
Pericardial effusion Myocardial involvement
Abbreviation: GI, gastrointestinal. Source: Adapted from Ref. 30.
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If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.