What is Multiple Chemical Sensitivity?

Image taken from http://www.dnrsystem.com/mcs.html

Multiple Chemical Sensitivity is commonly defined as a chronic medical condition characterized by symptoms that are triggered by exposure to low levels of chemicals.

Commonly suspected substances include petroleum products, scented products, pesticides, plastics, synthetic fabrics, smoke, and paints. Symptoms may be vague and non-specific, such as nausea, fatigue, and headaches.

Multiple Chemical Sensitivity has also been termed :

  • Toxic Injury (TI)
  • Chemical Sensitivity (CS)
  • Chemical Injury Syndrome (CI)
  • 20th Century Syndrome
  • Environmental Illness (EI)
  • Sick Building Syndrome
  • Idiopathic Environmental Intolerance (IEI)
  • Toxicant-induced Loss of Tolerance (TILT)

and is often involved in Gulf War Syndrome.

Multiple Chemical Sensitivity (MCS) is a Limbic System condition brought on by neurological trauma which may involve chemical injury, viral, environmental and/or psychological factors. The way in which the brain/mind/body expresses this trauma is unique to each person.

In some cases, symptoms gradually accumulate over time with no single triggering event.

The most common primary characteristic of Multiple Chemical Sensitivity is an abnormal and heightened ability to detect chemicals in the environment especially through sense of smell and taste.

Detection is accompanied by a host of physical reactions, an immediate noxious stimulus response and severe aversion to chemicals.

Within the Dynamic Neural Retraining System™ we understand the need for regulating the chemical industry and the hidden dangers in many household cleaners, personal hygiene products, new textiles and pesticides. We also understand that the initial neurological trauma and the ensuing trauma cycle involved in Multiple Chemical Sensitivity can alter the structure and function of the brain.

Trauma can also initiate an inflammatory response in the central nervous system.

The condition of Multiple Chemical Sensitivity indicates that the brain is stuck in a distorted self-protective mechanism.

This cross wired neuronal circuitry directly affects the physiology of the body and manifests in a range of neurological, immunological and endocrine system abnormalities.

In response to a chronic trauma cycle the body’s abilities to rest, digest or regenerate are affected.

This interrupts the normal growth cycle and detoxification process catapulting the brain and body into a cycle of chronic illness.

This destructive cycle leads to Limbic System ” priming”, which means less and less stimuli are needed to produce the same reaction. This can also lead to “Limbic Kindling”, which is the brain’s inability to discriminate between stimuli and the sensitivity can spread from one stimulus to another.

Some typical symptoms can include; acute sense of smell, difficulty breathing, cognitive impairment, brain fog, extreme fatigue, sore throat, loss of voice, muscle and joint pain, pain in chest or abdominal region, asthma, excessive mucus production, skin irritation, contact dermatitis, and hives or other forms of skin rash, headaches, racing heart rate, body flushing, neurological symptoms (nerve pain, pins and needles feelings, weakness, trembling, restless leg syndrome, etc.), tendonitis, seizures, visual disturbances (blurring, halo effect, inability to focus), extreme anxiety, panic and/or anger, unexplainable mood swings, sleep disturbance, suppression of immune system, digestive difficulties, nausea, indigestion/heartburn, vomiting, diarrhea, vertigo/dizziness, sensitivity to natural plant fragrance or natural pine terpenes, dry mouth, dry eyes, overactive bladder and food sensitivities.

Once Limbic System function is corrected, the destructive cycle is discontinued and sense of smell and taste begin to return to normal. Noxious stimulus response and physical aversion to chemicals subside and the central nervous system inflammatory cycle is interrupted. The hyper vigilance in the systems of the body relaxes which allows the natural growth and healing processes to resume.

MCS is often accompanied by protective or isolating behaviours, Anxiety and Depression.

Learn how DNRS can help you


This article, links and photos were taken from Dynamic Neural Retraining System


To learn more about MCS, contact Andrea Hartley at mindbodywellnesscoach@gmail.com or 609-533-7966.

Andrea Hartley is the publisher of Lehigh Valley Woman’s Journal,  wellness coach, and  personal trainer with a specialty in mind body connection, certified by AAAI/ISMA.


  1. Thank you for sharing above information to help others.

    I too suffered horribly for many years from MCS, EI, CFS, depression and multiple food allergies to name just a few of my diagnoses. Avoidance was my initial and ongoing approach for years while I researched everything I could about all of my conditions – which all started after moving into a new home, that was in 1995..

    Now in 2013 I am:

    100% MCS free
    100% food allergy free
    100% depression free
    100% EI free
    Have excellent energy levels
    I can eat out in any restaurant or home and eat all foods without reactions.
    I can enter and stay in any room, building or anywhere without skewed responses.

    My note to all suffering with the above conditions is:

    1. Continue becoming educated and avoid triggers. This will allow your body time to stop hyper vigilance and reacting and concentrate it’s energies on repair and healing.

    2. Utilize strategies to reprogram your brain and body to stop mounting skewed, excessive and unwanted responses. This may require a paradigm shift in thinking.

    I have been able to duplicate my ‘symptom free’ status with clients. I share my protocol in my book THE WHOLE PERSON WELL-BEING EQUATION which is now available globally on Amazon.

    MCS sufferers can become 100% symptom free.

    Elisabeth Hines, C.N.C.,C.B.P.
    Holistic Wellness Practitioner

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