When most people think about mold, they imagine dark spots growing on bathroom tile or basement walls. But the truth is that the majority of mold problems in homes are hidden. Mold often grows in places homeowners cannot see—behind drywall, under flooring, inside insulation, or inside HVAC systems. By the time visible mold appears, the underlying problem may have been growing for months or even years. Understanding how hidden mold forms, what warning signs to look for, and ho