Children with EHS/MCS and environmental issues in Japanese schools

Written by Yasuko KatoJournalist, Director, Life-Environmental NetworkJuly 7, 2019

Translation assistance by Pat Ormsby


EHS and MCS in Japan 

In Japan, the sick building syndrome or sick house syndrome (SHS) was recognized as a disease-causing factor according to the ICD-10 code T529 ”toxic effect of unspecified organic solvent” in 2004, and MCS was also recognized as a disease according to T659 “toxic effect of unspecified substance” in 2009. However, there is not enough social recognition of MCS. Most people in Japan including medical care professionals do not know little about MCS. 

Electromagnetic hypersensitivity (EHS) is still unknown to the general population. The estimated prevalence rates of MCS is 7.5%, and that of EHS is 6% in Japan.

I carried out a questionnaire surveywith Dr. Olle Johansson, Sweden, that found 80% of EHS participants also developed MCS. Our report noted that half of the EHS participants could not receive medical treatment due to lack of information about it among specialists and hospitals.

Children and the school environment

I conducted an interview with 10 children who had EHS, MCS or SHS and their parents in 2017. They faced unsympathetic  attitudes and ignorance about their symptoms. In 70% of these cases both the mother and child were hypersensitive.

One boy (8years old) with MCS and EHS was called “crazy” by his grandfather. This boy couldn’t enter his classroom due to the perfumes in softeners or detergents that volatilizing from his classmates’ clothing. He had to study by himself in another classroom without a teacher. His mother asked to the board of education and principal to establish a special care classroom for children with poor health. If it were established, he could learn from a teacher. The board, however, did not accept her request. She lobbied every way she could, including approaching assembly members and the mass media. After two years of efforts she could finally get a special care classroom arranged.

One junior high school girl (15years old) with MCS and EHS was transferred from a different school four months before graduation. She suffered effects from microwave radiation from Wi-Fi and also  effects from pesticides, floor wax and chemicals used in repair works in the school. She had always loved sports before she got MCS and EHS, so she joined the volleyball club as a manager. Even if she could not play volleyball, she wanted to get be involved in sports. The teacher who directed the club, however, forced her out. The teacher said “I can’t be responsible for what might happen to her”. She and her parents asked the school to reconsider its decision, but it wouldn’t.

Some schools help children with MCS/EHS stay involved. One elementary school nurse made a poster appealing for fragrance-free consideration. One junior high school removed Wi-Fi, and installed a wired network for a new student with EHS. But, such humanitarian schools are rare. I have written about those instances in my book” Sick school issues and measurement” (in Japanese).

A questionnaire survey of children

After that, I conducted a questionnaire survey of children and students with EHS, MCS or SHS, with healthy children as a control group. I got 11 replies from the sensitive group and 14 replies from the healthy (Graph 1). The average age was 11years in sensitive group, and 13 years in the control group.


Graph 1. Questionnaire participants


 Most of the sensitive group had also developed food allergies (72.7%), but among the control group only 14.3% had (Graph 2, P<0.05). There were no significant differences, however, in pollinosis, eczema or asthma. 

Graph 2. Participants allergy rates 

Using two questionnaires, I examined what symptoms were occurring at school. One was the Quick Environmental Exposure and Sensitivity Inventory (QEESI) for screening MCS that was developed by Dr. Claudia Miller, and the another one was an EHS questionnaire developed for screening EHS by Dr. Stacy Elititi. Both questionnaires were adjusted for Japan by Dr. Sachiko Hojo. The medium scores of the sensitive group were significantly higher than those of control group (p<0.001).







Cut-off value*

QEESI score

Q1 chemical intolerance

Q3 symptoms

Q5 disturbance of daily life













EHS score




*The cut-off value was estimated for Japanese adults. There is no cut-off value for children in Japan.


Graph 3 shows major reported symptoms. More than 80% of the sensitive group suffered from anxiety, stuffy noses, difficulty in breathing, dry skin, dull headaches, brain fog, and nausea. Healthy children also shown to experience health problems at their school. 


Graph 3. Reported major symptoms in school


I asked What do you think causes your symptoms?” and “Where do you get sick?” (Graph4). 



Graph 4.  Reported causes and places


I also asked about attendance. In the sensitive group, only 27.3% were “never absent”, 27.3% were“absent a few days a month”, 18.2% were “absent a few days a week”, and 27.3% were “hardly ever at school”. Thus, 72.7% of the sensitive group had difficulty going to school (Graph 5).


Graph.5  Attendance


The Ministry of Education, Culture, Sports, Science and Technology (MEXT) issued a guideline “Maintaining a Healthy Learning Environment”to help children with MCS and SHS in 2012. It recommended use of wax low in volatile organic compounds and avoidance of air fresheners and deodorizers. It recommended ventilating the classroom to reduce the concentrations of chemical substances, if the child's symptoms were mild, and to practice home-visit lessons, if the child's symptoms were severe enough to make attending school difficult.

Many local governments developed the guidelines to reduce health problem in schools. For example, Asahikawa City, Hokkaido, recommends conducting a health survey of children before and after relocation (for three months) to a school building that has been newly built or rebuilt. If symptoms or signs of illness are seen, the person in charge must immediately report them to the city. Parents and teachers are asked to reduce their use of perfume, cosmetics and hair cream. The guidelines also mention health problems related to EMFs (mobile phones, TVs, microwave ovens, personal computers and high voltage lines), and recommended inquiring into the environment in children’s homes. Moreover, it advised antioxidants supplementation, diet therapy, sweating to stimulate metabolism, and getting good sleep if the children experienced any health problems.

Text book ink measurements

Many children experience health problems due to VOCs from text book ink. Some parents asked MEXT to reduce the VOCs from text books in 2000. MEXT examined text book VOC levels from 2003 to 2005, and published measurementsof four versions of textbooks:

1) Sun-dried version: dried in the sun at the school or at the home,

2) Cover copy version: Most of the VOCs volatilize from the cover of the text book, so a copy is made of the text book cover, and wrapped over the cover. 

3) Full copied version: all pages copied,

4) Photo-catalyzed paper cover version: photo-catalyzed chemical paper used for the text book cover.

Parents can tell the school in advance which version they want. The most used version is sun dried. 

Wi-Fi in school

Wi-Fi in school has been rapidly spreading in Japan since 2014. The government and the board of education recognize chemical risks, but they do not consider EMF risks. In Japan, the media rarely  report on health problems as being related to EMFs. As the Japanese government has not adopted the precautionary principle when making policy decisions, the EMF health problem is underestimated. 

Wi-Fi in schools, however, is apt to become a huge problem soon. More research is needed to elucidate related health problems in schools to protect the health of children, teachers and staff.