Look for visible mold growth (it may look cottony, velvety, rough, or leathery and have different colors like white, gray, brown, black, yellow, or green). Mold often appears as a staining or fuzzy growth on furniture or building materials (walls, ceilings, or anything made of wood or paper). Look for signs of moisture or water damage (water leaks, standing water, water stains, condensation, etc.).
Unfortunately some people are sensitive to mold. People with chronic illnesses or people with immune system problems may be more likely to get infections from certain molds, viruses and bacteria.
Many of you might find it hard to believe but nutrients are really plentiful in our household environment, Many building materials (such as wood, sheetrock, etc.) provide food that can support mold growth. Even dust particles, or oily fingerprint smudges that are ever-present, are enough of food source to support mold growth. Molds can grow almost anywhere there is enough moisture or high humidity.