The condition of chemical sensitivity is not new. General symptoms induced by chemicals have been known variously as multiple chemical sensitivity (MCS), idiopathic environmental intolerance and environmental illness. It seems, however, that chemical sensitivity has become particularly common during the past 50 years and that there is a connection to the Western life style. A search for multiple chemical sensitivity on Medline today will give you about 2300 web pages. The term “sensory hyperreactivity (SHR)” has been used for just the past 10 years and describes chemical sensitivity with symptoms exclusively localized to the airways in combination with a positive capsaicin inhalation cough test.