While working on a blog post about one woman’s experience of debilitating illness after being exposed to toxic chemicals, I realized that at the heart of this story is an issue that is poorly understood, and under-discussed within the medical industry. It’s called Multiple Chemical Sensitivity (MCS), and no one really knows how many people are affected by it. Basically, it is a chronic medical condition in which a person becomes sick, or exhibits allergy-like reactions to chemicals that he or she has become exposed to at doses that are generally considered safe for humans.