The possible list of symptoms of Multiple Chemical Sensitivity a/k/a Sick Building Syndrome or Environmental Illness is almost endless - varies from one patient to the next. Also worthy of mention here is the fact that there is no sharp demarcation between the symptoms of MCS and those of ME/CFS/CFIDS/PVFS (myalgic encephalomyelitis - chronic fatigue), but that most sufferers of MCS complain of at least several of the following: