Mold may be one of the largest, silent endemics:

• An estimated 50% of homes have water damage (multiple studies).
• The common symptoms of mold illness are varied, and include fatigue, brain fog, sleep issues, sinus issues, shortness of breath, weight changes, and hormonal changes.
• Mold can grow within 24 to 48 hours of water exposure (EPA). 
• Common “cosmetic” issues like paint peeling and cracks in your foundation can be signs of water damage.
• Mold in your home and office is not always visible, and the EPA estimates that 85% of offices have had water damage.
• Mold may produce a musty, earthy, damp odor, which can be a telltale sign of its presence even if it's not immediately visible.
• 21% of American asthma cases could be associated with dampness and mold (WHO).
• 96% of chronic sinus infections are a direct result of mold overexposure (Mayo Clinic).