Multiple-chemical sensitivity (MCS) is a disputed condition that is believed to result when chemicals or substances in the environment or in food disrupt the immune system, leading to nausea, respiratory problems, headaches, dizziness, rashes, fatigue and many other afflictions. Some people go to great extremes to eliminate hostile chemicals and synthetic materials from their lives, and even lining their homes with aluminium or moving to remote parts of the world.
The Environmental Health Center in Dallas treated 17,000 MCS patients between 1976 and 1988. Canada recognizes MCS and offers many social services to its victims. The Board on Environmental Studies and Toxicology of the National Academy of Sciences estimates that 15 percent out-of-date statistics of the population of the USA is sensitive to common household chemicals.