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Multiple chemical sensitivity (MCS) 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]} However, recent imaging studies have shown that it is likely a neurological condition. ^[4]

^ Genuis SJ (May 2013). "Chemical sensitivity: pathophysiology or pathopsychology?". Clinical Therapeutics. 35 (5): 572–7. doi:10.1016/j.clinthera.2013.04.003. PMID 23642291.
^ Templeton DM, Schwenk M, Duffus JH (2016), "Multiple Chemical Sensitivity (MCS)", IUPAC Glossary of Terms Used in Neurotoxicology, De Gruyter, doi:10.1515/pac-2015-0103, 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: ...
^ Sears ME (2007), The Medical Perspective on Environmental Sensitivities (PDF), 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.
^ Molot J, Sears M, Anisman H (2023-08-01). "Multiple chemical sensitivity: It's time to catch up to the science". Neuroscience & Biobehavioral Reviews. 151: 105227. doi:10.1016/j.neubiorev.2023.105227. ISSN 0149-7634. PMID 37172924.