What if the thing making you feel terrible is in your walls, your air—or even something you eat? Brain fog, fatigue, headaches, sinus issues, anxiety, strange sensitivities, breathing problems, and other seemingly unrelated symptoms can all show up in mold illness. Donna Woods, CRNP explains where exposure hides, how it can affect the body, what testing can—and can’t—tell you, how to investigate your home or workplace, and why getting better starts with finding and removing the source.