Abstract
Multiple Chemical Sensitivity (MCS) is a systemic disorder causing central nervous, irritative and gastrointestinal symptoms, and can be included in the category of "idiopathic environmental intolerance" (IEI). This term describes phenomena with multiple, recurrent symptoms associated with various environmental factors that are tolerated by most people without problems. Those advocating these concepts attribute the symptoms to exogenous substances. Those opposing them explain the phenomena by classical conditioning or other psychopathological processes. To the extent that controlled studies are available, they have not furnished any hard evidence for toxic or immunological causes. In addition to psychopathological origins, neurobiological processes are also implicated.
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