Several sick occupants may report individual symptoms which do not appear to be connected. The key to discovery SBS is if a number of people first experience their illnesses within a period of weeks. In most cases, SBS symptoms will be relieved soon after the occupants leave the particular room or zone. However, there can be lasting effects of various neurotoxins, which may not clear up when the occupant leaves the building. Sensitive individuals can have long-term health effects.