Multiple chemical sensitivity (MCS) or idiopathic environmental intolerances (IEI) is a chronic medical condition and syndrome
characterized by symptoms that the affected person attributes to low-level chemical exposures to commonly used chemicals.
What causes this condition? A Psychology Today blog post about the choices involved with a chronic illness such as MCS
Can the things we put in the air hurt us? This is a site
which tells how to avoid exposure to toxins in your life.
Chronic illness is linked to chemical sensitivities.