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Multiple chemical sensitivity (MCS), also known as idiopathic environmental intolerances (IEI), is an unrecognized and controversial diagnosis characterized by chronic symptoms attributed to exposure to low levels of commonly used chemicals.[1][2] Symptoms are typically vague and non-specific. They may include fatigue, headaches, nausea, and dizziness.
Although these symptoms can be debilitating, MCS is not recognized as an organic, chemical-caused illness by the World Health Organization, American Medical Association, or any of several other professional medical organizations.[3][obsolete source] Blinded clinical trials show that people with MCS react as often and as strongly to placebos as they do to chemical stimuli; the existence and severity of symptoms is seemingly related to the perception that a chemical stimulus is present.[4][obsolete source][5][obsolete source]
The word chemical in the name is used loosely and includes natural substances (e.g., the aromas produced by pine trees or other fragrant plants).[2] Commonly attributed substances include scented products (e.g. perfumes), pesticides, plastics, synthetic fabrics, smoke, petroleum products, and paint fumes.[1]
multiple chemical sensitivity (MCS) -environmental illness -idiopathic environmental intolerance -Intolerance condition attributed to extreme sensitivity of individuals to various environmental chemicals, found in air, food, water, building materials, or fabrics. Note 1: This syndrome is characterized by the patient's belief that his or her symptoms are caused by very low-level exposure to environmental chemicals. The term "chemical" is used to refer broadly to many natural and man-made substances, some of which have several chemical constituents. Note 2: ...
Note: The opinions expressed in this report are those of the author and do not necessarily reflect the views of the Canadian Human Rights Commission.
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