Editing Multiple chemical sensitivity (section)

== Symptoms ==
Symptoms are typically [[Vagueness|vague]] and [[Non-specific symptoms|non-specific]], such as [[Fatigue (medical)|fatigue]] or [[headache]]s.<ref name="Canberra">{{Citation|title=A Scientific Review of Multiple Chemical Sensitivity: Identifying Key Research Needs |date=2010 |publisher= National Industrial Chemicals Notification and Assessment Scheme, Australian Government |location=Canberra, Australia |url=http://test.nicnas.gov.au/Media/Latest_News/MCS.asp |archive-url=https://web.archive.org/web/20200307155500/http://test.nicnas.gov.au/Media/Latest_News/MCS.asp |archive-date=2020-03-07 }}</ref> These symptoms, although they can be disabling, are called non-specific because they are not associated with any single specific medical condition.

Symptoms affect a variety of different [[Organ system|organ systems]].  Different people have different symptoms and different affected systems, but cognitive and neurologic symptoms (e.g., headache and [[brain fog]]) are common, as are [[Systemic symptom|systemic symptoms]] (e.g., fatigue).<ref name="Linde" />  Other people have symptoms affecting the eyes, ears, and nose (e.g., [[stuffy nose]]), the respiratory system (e.g., [[shortness of breath]]), gastrointestinal system (e.g., [[nausea]]), musculoskeletal system (e.g., [[joint pain]]), or dermatological system (e.g., [[itching]]).<ref name="Linde" />

A 2010 review of MCS literature said that the following symptoms, in this order, were the most reported in the condition: headache, fatigue, confusion, depression, shortness of breath, arthralgia, myalgia, nausea, dizziness, memory problems, gastrointestinal symptoms, respiratory symptoms.<ref name="Canberra" />

Symptoms mainly arise from the [[autonomic nervous system]] (such as [[nausea]] or [[dizziness]]) or have psychiatric or psychological aspects (such as difficulty concentrating).<ref name="Katoh">{{Cite journal |last=Katoh |first=Takahiko |date=2018 |title=Multiple Chemical Sensitivity (MCS): History, Epidemiology and Mechanism |journal=Nihon Eiseigaku Zasshi |trans-journal=Japanese Journal of Hygiene |language=ja|volume=73|issue=1|pages=1–8|doi=10.1265/jjh.73.1|issn=1882-6482|pmid=29386440|doi-access=free}}</ref>