Multiple chemical sensitivity

Multiple chemical sensitivity (MCS), also known as idiopathic environmental intolerances (IEI), is a disputed chronic condition characterized by symptoms that the affected person attributes to low-level exposures to commonly used chemicals. Symptoms may include fatigue, headache s, nausea, and dizziness.

Multiple chemical sensitivity in ME/CFS
Multiple Chemical Sensitivity (MCS) is one of several illnesses or conditions experienced alongside of ME/CFS and fibromyalgia. The International Consensus Criteria for ME recognizes several kinds of sensitivity including odor sensitivity as neurosensory symptoms.

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 * 2010, Allergies and Multiple Chemical Sensitivity in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
 * 2016, Multiple Chemical Sensitivity in Fibromyalgia, ME/CFS
 * 2016, Multiple Chemical Sensitivity