Sick or tight building syndrome is a term that describes from the ill effects building occupants suffer due to poor indoor air quality. Although not attributed to any specific disease (SBS), leads to a loss of employee productivity.

An extensive list of symptoms related to (SBS) include:
- headache
- cough
- dizziness
- nausea
- eye, nose or throat irritation
- dry cough, dry or itching skin
- difficulty in concentration
- fatigue
- sensitivity to odors
- hoarseness of voice
- allergies
- cold, flu-like symptoms
- increased incidence of asthma
- shortness of breath on mild exertion
- edema
- palpitations
- nosebleeds
- cancers
- pregnancy problems and miscarriages
- Legionnaire’s disease
- humidifier fever
- pneumonia and occupational asthma
- chest pain