Might You Have Multiple Chemical Sensitivity?

allergies asthma brain electrohypersensitivity energy eyes headaches heart multiple chemical sensitivity nausea nose skin Jan 27, 2019

by Sophia Ruan Gushée


There has never been more awareness to our sensitivities: nuts, dairy, gluten, sulfites, and more.

So why not chemicals?

Multiple Chemical Sensitivity (MCS) is a term that describes a set of physical reactions to chemicals—both natural and manmade—in our environment, including from our everyday household products. Some of these symptoms include chronic symptoms that millions of people endure. A home detox can unburden your body's chronic chemical exposures, and you may feel better.


Symptoms of Multiple Chemical Sensitivity

Symptoms vary and can range from mild to disabling and commonly include:

  • Asthma

  • Headaches

  • Confusion, memory loss
  • Dizziness
  • Fatigue

  • Heart rate changes

  • Irritability

  • Muscle and joint aches

  • Nausea
  • Rashes

  • Rhinitis

It may be accompanied by electrohypersensitivity


MCS has been Treated as a Mental Health Issue

The term multiple chemical sensitivity (MCS) as a medial diagnosis has been controversial among medical authorities. The American Medical Association doesn’t consider multiple chemical sensitivity to be an illness. Descriptions of MCS often note that MCS can result from mental health issues, and approaches to treat MCS sometimes include antidepressants or pharmaceuticals intended for specific symptoms, like headaches. 

The Heuser et al, 1992 study introduced in the next section reported:

Patients with MCS present to their physicians with a startling spectrum of complaints. These complaints are often presented in a manner highly suggestive of a psychiatric disorder. None of them easily lend themselves to measurement. General malaise and weakness, fatigue, headaches, irritability, depression, memory problems, itching, numbness, "creepy and crawly" sensations, burning sensations in the nose, sore throat, hoarseness, shortness of breath, cough, abdominal distress, are all "soft" complaints and therefore not easily documented.


What Does the Data Reveal About Whether MCS is a Mental Issue?

In one 1992 study (Heuser et al, 1992) of 135 patients (75% females), published in National Academies Press (US), the senior author of the published paper had directed a headache and chronic pain clinic for more than ten years. It became clear to the senior author that headaches were triggered by chemicals in the environment, even from very small concentrations. Not all exposed people had reactions, but some did and headaches were triggered by small exposures from perfumes, other fumes, smoke and mist. 

And headaches were not the only symptom. A wide range of symptoms have been associated with MCS, including irritability, memory loss, depression, numbness, tingling, crawling sensation, etc

The Heuser et al, 1992 study performed certain immune function tests (TA1 cells and chemical antibody levels) and found abnormality in many patients suffering from headaches. Examples of some the study's finding include: 

  • EEGs were abnormal in 45% of tested patients.
  • MRI scans were also abnormal in a high percentage of cases. In some scans there was a definite impression of atrophy (13%) or demyelinating disease (7%). Others (8%) had more ill-defined non-diagnostic lesions.
  • Visual evoked (VER) and brain stem auditory evoked (BAER) responses were also abnormal in a high percentage of cases.
  • ENT exam showed abnormalities in a high percentage of patients. The consistent findings were atrophic rhinitis in patients with severe nasal complaints. Sinusitis or at least thickened mucous membranes were found on sinus examination.
  • Abnormal levels of chemical antibodies in a high percentage of patients with MCS

Since 1992, the data continues to yield inconclusive results. For example, in a 2000 paper "Multiple Chemical Sensitivity: A Review of the Theoretical and Research Literature" in Neuropsychology Review by Andrew S. Labarge and Robert J. McCaffrey, it determined:

Upon examination of the patient with a diagnosis of MCS, objective physical findings and consistent laboratory abnormalities are typically nonexistent. The concept of MCS has ignited considerable controversy in the fields of toxicology, immunology, allergy, psychology, and neuropsychology. Central to the controversy is the disagreement over the extent to which the manifestation of MCS is mediated by psychological factors.  

From the website of American Family Physician:

[MCS] has been rejected as an established organic disease by the American Academy of Allergy and Immunology, the American Medical Association, the California Medical Association, the American College of Physicians, and the International Society of Regulatory Toxicology and Pharmacology. It may be the only ailment in existence in which the patient defines both the cause and the manifestations of his own condition. Despite this, it has achieved credibility in workmen's [sic] compensation claims, tort liability, and regulatory actions.


MCS is Increasingly Recognized as Disabling for Some

Increasingly, court cases are ruling in favor of those whose sensitivities to low concentrations of toxic exposures are disabling. For example, in McBride v. City of Detroit, a plaintiff was awarded $100,000, and its employer, the City of Detroit agreed to incorporate a fragrance-free policy into its ADA handbook and training. 

The court ruled that an allergy to scents can be a disability under ADAAA, the Americans with Disabilities Act—recognizing symptoms such as asthma, breathing difficulties, or an itchy, inflamed rash called contact dermatitis. Those informed recognize that once someone has an allergy to a chemical, the symptoms are likely to be triggered by increasingly smaller exposures.

MCS is becoming internationally recognized as an emerging and sometimes disabling condition (Gibson et al, 2016). 

  • In the Netherlands, 27% reported multiple symptoms from chemicals
  • In Germany, 32% reported similar complaints
  • In Sweden, that 32% reported some odor intolerance, with 19% having some life impacts from the intolerance. In the same country, 15.6% of teenagers reported MCS
  • And in Korea, the prevalence is estimated at 16.4%, with higher numbers among people with atopic dermatitis and those who have lived in new housing

MCS seems to disproportionately affect women. 


Sources of Triggers

Common chemicals described as causing reactions are pesticides, petro chemicals, household cleaners, exhausts, dry cleaning chemicals, perfumes, smoke, and air fresheners.

Common sources of synthetic and natural chemicals that may contribute to multiple chemical sensitivity include:



While the diagnosis or label of MCS remains controversial, a growing and international population is reporting symptoms and illness from low concentrations of chemical exposures. Symptoms associated with MCS are similar to those reported for Sick Building Syndrome, fragrance allergies, and electro-hypersensitivity (which has also been recognized by courts as disabling for some).

Regardless of whether you or someone you care about may have MCS, it's worth learning more about the symptoms and possible triggers of MCS because there are simple, inexpensive "experiments" you can try to see if you or the sensitive person may feel better: Start reducing your exposures to synthetic chemicals from everyday household products. It will also reduce your risks to a long list of health issues.

To get started, consider these articles:


Additional References

"Multiple Chemical Sensitivity" on WebMD

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About Ruan Living

Ruan Living simplifies a nontoxic lifestyle through its Practical Nontoxic Living podcast, free detox workshops, online D-Tox Academy, and transformative 40-Day Home Detox. It aims to help you avoid toxic chemicals, heavy metals, and electromagnetic fields (EMFs) from what you buy, own, and do— without compromising your joy and convenience. Ruan was founded by Sophia Ruan Gushée, author of the bestselling critically acclaimed book A to Z of D-Toxing: The Ultimate Guide to Reducing Your Toxic Exposures and several detox workbooks. A graduate of Brown University and Columbia Business School, Sophia has served on the Brown University School of Public Health Advisory Council and Well+Good Council. A popular nontoxic living speaker, consultant, and teacher, Sophia lives in New York City with her husband and three daughters. Her passion for empowering others to enjoy nontoxic living began with the birth of her first daughter in 2007. Everything she creates is a love letter to her children and for the healthiest, brightest future possible. You can learn more here: Sophia’s Impact.


This article is for informational purposes only. This information is provided “as is” without warranty.

It is not, nor is it intended to be, a substitute for professional medical advice, diagnosis, or treatment and should never be relied upon for specific medical advice. We do not offer medical advice, course of treatment, diagnosis, or any other opinion on your conditions or treatment options. To the extent that this article features the advice of physicians or medical practitioners, the views expressed are the views of the cited expert and do not necessarily represent the views of Ruan Living.

In no event will Sophia Ruan Gushee or Ruan Living be liable for any damages or loss of any kind resulting from the use of this website. Anyone relying upon or making use of the information on this website does so at his or her own risk.

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