Environmental Intolerances
An Integrative Approach to Environmental Intolerances: Multiple Chemical Sensitivity and Related Illnesses
What are environmental intolerances?
In recent years, there has been an increase in the number of illnesses that may be caused by a reaction to something in a person’s environment. These illnesses include:
- Multiple chemical sensitivity 
- (MCS) Sick building syndrome 
- Post 9/11 syndrome 
- Silicone breast implant intolerance 
- Gulf War syndrome 
- Toxic mold syndrome 
- Electromagnetic field intolerance 
This handout will focus mainly on multiple chemical sensitivity (MCS) because it is the best-studied of these environmental illnesses. But the causes, diagnosis, and treatment are similar for all of them.


