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You can be tested for multiple chemical sensitivity by being tested for sensitivity using the chemicals that you have deemed relevant by your doctor. You can learn more about this condition at the Wikipedia.

Multiple Chemical Sensitivity

Els Valkenburg has written:

'Understanding multiple chemical sensitivity' -- subject(s): Multiple chemical sensitivity, Popular works

Multiple chemical sensitivity typically begins with one high-dose exposure to a chemical, but it may also develop with long-term exposure to a low level of a chemical.