Sick Building Syndrome: Symptoms, Causes & Prevention

Sick Building Syndrome (SBS) is a growing concern in the United States, particularly as people spend increasing amounts of time indoors in offices, apartments, schools, and commercial buildings. The term refers to a situation where occupants of a building experience a range of health and comfort-related symptoms that appear to be linked to time spent inside a particular building, yet no specific illness or cause can be clearly identified.

Unlike a diagnosable disease, sick building syndrome is a collection of symptoms that improve when the person leaves the building. It has become especially relevant in modern workplaces with sealed environments, synthetic materials, and centralised HVAC (heating, ventilation, and air conditioning) systems.

This blog explores what SBS is, its symptoms, causes, risk factors in the USA, and practical prevention strategies.

What is Sick Building Syndrome?

Sick Building Syndrome refers to a condition in which building occupants experience acute health or discomfort effects that seem linked to time spent in a building, but no specific illness or contaminant can be identified.

It is important to distinguish SBS from building-related illnesses such as Legionnaires’ disease, where a clear microbial cause is present. In SBS:

• Symptoms are real but often non-specific
• No single identifiable cause is found
• Symptoms improve when leaving the building

The rise of sealed, energy-efficient buildings in the USA has contributed significantly to increased reports of sick building syndrome.

Common Symptoms of Sick Building Syndrome

The symptoms of SBS can vary from person to person and often affect multiple systems of the body. They are typically non-specific, which makes diagnosis challenging.

1. Respiratory Symptoms

• Dry or irritated throat
• Nasal congestion
• Sneezing
• Coughing
• Shortness of breath in some cases

These symptoms are often mistaken for seasonal allergies or mild infections.

2. Neurological Symptoms

• Headaches
• Difficulty concentrating
• Fatigue or drowsiness
• Dizziness
• “Brain fog”

These symptoms are among the most commonly reported in office environments.

3. Eye, Nose, and Throat Irritation

• Burning or watery eyes
• Itchy eyes
• Dry nasal passages
• Throat irritation

These are often linked to poor indoor air quality.

4. Skin Symptoms

• Dry skin
• Rashes
• Itching or irritation

5. General Symptoms

• Tiredness
• Feeling unwell without a clear cause
• Reduced productivity at work

A key feature of sick building syndrome is that these symptoms typically improve after leaving the building, such as during weekends or holidays.

Causes of Sick Building Syndrome in the USA

SBS does not have a single cause. Instead, it is usually the result of multiple environmental and building-related factors.

1. Poor Indoor Air Quality

One of the leading contributors to SBS is poor air quality. This can result from:

• Inadequate ventilation
• Accumulation of dust and pollutants
• Carbon dioxide build-up in crowded spaces
• Outdoor pollution entering indoor environments

In many modern US office buildings, energy-efficient designs limit fresh air exchange, worsening the problem.

2. Chemical Contaminants

Indoor environments often contain volatile organic compounds (VOCs) released from:

• Paints and varnishes
• Cleaning products
• Carpets and adhesives
• Office equipment such as printers and photocopiers

These chemicals can irritate the eyes, nose, and throat.

3. Biological Contaminants

Mould, bacteria, and allergens can thrive in poorly maintained buildings. Common sources include:

• Damp walls or ceilings
• Air conditioning systems with poor maintenance
• Humidifiers or cooling systems
• Water leaks

4. Inadequate Ventilation

Modern buildings in the USA are often tightly sealed to improve energy efficiency. However, without proper ventilation:

• Pollutants accumulate indoors
• Fresh air circulation is reduced
• Carbon dioxide levels increase

This can significantly contribute to sick building syndrome symptoms.

5. Poor Temperature and Humidity Control

Uncomfortable indoor conditions can worsen SBS symptoms:

• Excessively dry air causes irritation
• High humidity encourages mould growth
• Poor temperature regulation affects comfort and focus

6. Psychological and Workplace Factors

Interestingly, stress and workplace conditions can also contribute:

• High workload and stress
• Poor lighting conditions
• Lack of control over workspace environment
• Job dissatisfaction

While not direct causes, these factors can amplify symptoms.

Who is Most at Risk in the USA?

Sick Building Syndrome can affect anyone, but certain groups are more vulnerable:

• Office workers in sealed buildings
• School and university students
• Healthcare workers in enclosed facilities
• Individuals with asthma or allergies
• People spending long hours indoors

Urban environments in major US cities may see higher incidence due to dense office spaces and reliance on central HVAC systems.

Diagnosis Challenges

One of the biggest issues with SBS is that it is difficult to diagnose medically. There is no specific test for it.

Doctors usually:

• Rule out allergies, infections, or chronic illnesses
• Assess symptom patterns
• Evaluate environmental exposure history
• Recommend environmental inspection of the building

Because symptoms are non-specific, SBS is often underreported or misdiagnosed.

Prevention Strategies for Sick Building Syndrome

The good news is that SBS can often be managed or prevented with proper building maintenance and behavioural adjustments.

1. Improve Ventilation

• Increase fresh air circulation
• Use air purifiers where necessary
• Ensure HVAC systems are functioning properly
• Avoid overcrowding indoor spaces

2. Maintain HVAC Systems

Regular maintenance of heating and cooling systems is essential:

• Clean air ducts regularly
• Replace filters on schedule
• Check for mould or moisture build-up

3. Reduce Chemical Exposure

• Use low-VOC paints and materials
• Switch to eco-friendly cleaning products
• Avoid unnecessary chemical usage indoors

4. Control Humidity Levels

• Maintain indoor humidity between 30–50%
• Fix water leaks promptly
• Use dehumidifiers in damp areas

5. Increase Natural Light and Breaks

• Encourage exposure to natural sunlight
• Take regular outdoor breaks
• Improve workplace lighting conditions

6. Regular Cleaning and Dust Control

• Vacuum carpets frequently
• Clean surfaces to reduce dust accumulation
• Maintain hygiene in shared office spaces

7. Encourage Workplace Wellness

• Promote stress management programmes
• Improve ergonomics of workstations
• Encourage flexible work environments where possible

These strategies significantly reduce the likelihood of sick building syndrome in both residential and commercial settings.

Sick Building Syndrome vs COVID-19 Era Awareness

The COVID-19 pandemic increased awareness of indoor air quality across the USA. Many organisations began re-evaluating ventilation systems and workspace safety.

While SBS is not infectious, the pandemic highlighted:

• Importance of air circulation
• Role of indoor environments in health
• Need for healthier building design

This has led to increased investment in “healthy buildings” across the country.

Long-term Impact of Sick Building Syndrome

Although SBS is not considered life-threatening, it can have significant long-term effects:

• Reduced workplace productivity
• Increased absenteeism
• Chronic discomfort or fatigue
• Lower quality of life
• Higher healthcare utilisation

For businesses, SBS can also result in reduced employee performance and higher operational costs.

Way Forward

Sick Building Syndrome is a modern environmental health issue that reflects how indoor spaces impact human wellbeing. In the USA, where people spend nearly 90% of their time indoors, understanding and addressing sick building syndrome is increasingly important.

While the condition is not linked to a single disease or toxin, it arises from a combination of poor ventilation, chemical exposure, biological contaminants, and workplace stress. The good news is that it is largely preventable through better building design, regular maintenance, and healthy workplace practices.

For individuals, especially NRIs travelling between countries, maintaining access to quality healthcare is essential in case symptoms persist or require medical evaluation. In India, unexpected health issues during travel can become financially stressful without proper coverage. This is where NRI health insurance from Niva Bupa Health Insurance can be valuable, offering health insurance solutions that help NRIs manage medical expenses during their visits and ensure access to timely care.

Ultimately, improving indoor environments is not just about comfort; it is about long-term health, productivity, and wellbeing.

FAQs

1. What is sick building syndrome?

Sick Building Syndrome is a condition where people experience symptoms like headaches, fatigue, and irritation that are linked to time spent in a specific building, without a clearly identifiable medical cause.

2. Is sick building syndrome dangerous?

It is generally not life-threatening, but it can significantly affect comfort, productivity, and quality of life.

3. What are the main causes of sick building syndrome?

Common causes include poor ventilation, chemical pollutants, mould growth, and inadequate HVAC maintenance.

4. Can sick building syndrome be cured?

There is no medical “cure,” but symptoms usually improve when environmental conditions are corrected or when the person leaves the building.

5. Who is most affected by sick building syndrome in the USA?

Office workers, students, and people spending long hours in sealed indoor environments are most commonly affected.

6. Can sick building syndrome affect long-term health?

Sick Building Syndrome usually does not cause permanent illness, but prolonged exposure to poor indoor air quality can lead to ongoing discomfort, reduced productivity, and worsening of conditions like asthma or allergies.

7. How can employers reduce sick building syndrome in offices?

Employers can improve ventilation, maintain HVAC systems, reduce indoor pollutants, ensure regular cleaning, and create a more comfortable and well-lit workspace.

8. When should someone see a doctor for sick building syndrome symptoms?

If symptoms like headaches, breathing issues, or fatigue persist even outside the building or worsen over time, it is important to consult a doctor to rule out other medical conditions.