is a medical condition where people in a home or building suffer from symptoms of illness or feel unwell with no obvious cause. The symptoms tend to increase in severity with the time people spend in the home or building, and improve over time or even disappear when people are away from the dwelling.

The main identifying observation is an increased incidence of complaints of symptoms such as headache, eye, nose, and throat irritation, asthma, fatigue, and dizziness and nausea. These symptoms appear to be linked to time spent in a home or building. SHS/SBS is also used interchangeably with "building-related symptoms", which orients the name of the condition around patients rather than a "sick" building. A 1984 World Health Organization (WHO) report suggested up to 30% of new and remodeled homes and buildings worldwide may be subject to complaints related to poor indoor air quality.

Sick home and building syndrome causes are frequently pinned down to mold and fungus growth and related issues in the heating, ventilation, and air conditioning (HVAC) systems. Other causes have been attributed to contaminants produced by outgassing of some types of building materials, volatile organic compounds (VOCs) and improper exhaust ventilation, or lack of adequate fresh-air intake/air filtration.

Wet or damp basements, leaking appliances or roofs, poor design, faulty construction, structural failure or aging can lead to deterioration of the 7 major systems that make up your home or office place. Even in brand new construction.

Mold growth may result because of these failures, especially if water infiltration and moisture are involved. Mold in your house means your family’s heath is at risk and your home is unhealthy.

Sick Home Syndrome/Sick Building Syndrome is further categorized into three main causal factors;