multiple chemical sensitivity

multiple chemical sensitivity A syndrome in which multiple symptoms reportedly occur with low-level exposure to many common chemicals. Abbreviated MCS. MCS is a controversial issue and has been rejected by numerous medical societies as an established organic disease. Proposed theories to explain MCS include allergic reactions, dysfunction of the immune system, neurobiological sensiti zation, and various psychological theories, but there is insufficient scientific evidence to confirm a relationship between any of these possible causes and the occurrence of symptoms.